19 files changed, 538 insertions, 160 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d85be90d5888..e722e9d62221 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -898,6 +898,18 @@ config LKDTM
         Documentation on how to use the module can be found in
         Documentation/fault-injection/provoke-crashes.txt
 
+config CPU_NOTIFIER_ERROR_INJECT
+        tristate "CPU notifier error injection module"
+        depends on HOTPLUG_CPU && DEBUG_KERNEL
+        help
+          This option provides a kernel module that can be used to test
+          the error handling of the cpu notifiers
+
+          To compile this code as a module, choose M here: the module will
+          be called cpu-notifier-error-inject.
+
+          If unsure, say N.
+
 config FAULT_INJECTION
         bool "Fault-injection framework"
         depends on DEBUG_KERNEL
@@ -1039,10 +1051,10 @@ config DYNAMIC_DEBUG
 
           Usage:
 
-          Dynamic debugging is controlled via the 'dynamic_debug/ddebug' file,
+          Dynamic debugging is controlled via the 'dynamic_debug/control' file,
           which is contained in the 'debugfs' filesystem. Thus, the debugfs
           filesystem must first be mounted before making use of this feature.
-          We refer the control file as: <debugfs>/dynamic_debug/ddebug. This
+          We refer the control file as: <debugfs>/dynamic_debug/control. This
           file contains a list of the debug statements that can be enabled. The
           format for each line of the file is:
 
@@ -1057,7 +1069,7 @@ config DYNAMIC_DEBUG
 
           From a live system:
 
-                nullarbor:~ # cat <debugfs>/dynamic_debug/ddebug
+                nullarbor:~ # cat <debugfs>/dynamic_debug/control
                 # filename:lineno [module]function flags format
                 fs/aio.c:222 [aio]__put_ioctx - "__put_ioctx:\040freeing\040%p\012"
                 fs/aio.c:248 [aio]ioctx_alloc - "ENOMEM:\040nr_events\040too\040high\012"
@@ -1067,23 +1079,23 @@ config DYNAMIC_DEBUG
 
                 // enable the message at line 1603 of file svcsock.c
                 nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
-                                                <debugfs>/dynamic_debug/ddebug
+                                                <debugfs>/dynamic_debug/control
 
                 // enable all the messages in file svcsock.c
                 nullarbor:~ # echo -n 'file svcsock.c +p' >
-                                                <debugfs>/dynamic_debug/ddebug
+                                                <debugfs>/dynamic_debug/control
 
                 // enable all the messages in the NFS server module
                 nullarbor:~ # echo -n 'module nfsd +p' >
-                                                <debugfs>/dynamic_debug/ddebug
+                                                <debugfs>/dynamic_debug/control
 
                 // enable all 12 messages in the function svc_process()
                 nullarbor:~ # echo -n 'func svc_process +p' >
-                                                <debugfs>/dynamic_debug/ddebug
+                                                <debugfs>/dynamic_debug/control
 
                 // disable all 12 messages in the function svc_process()
                 nullarbor:~ # echo -n 'func svc_process -p' >
-                                                <debugfs>/dynamic_debug/ddebug
+                                                <debugfs>/dynamic_debug/control
 
           See Documentation/dynamic-debug-howto.txt for additional information.
 
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 9b5d1d7f2ef7..43cb93fa2651 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -3,7 +3,7 @@ config HAVE_ARCH_KGDB
         bool
 
 menuconfig KGDB
-        bool "KGDB: kernel debugging with remote gdb"
+        bool "KGDB: kernel debugger"
         depends on HAVE_ARCH_KGDB
         depends on DEBUG_KERNEL && EXPERIMENTAL
         help
@@ -57,4 +57,26 @@ config KGDB_TESTS_BOOT_STRING
           information about other strings you could use beyond the
           default of V1F100.
 
+config KGDB_LOW_LEVEL_TRAP
+       bool "KGDB: Allow debugging with traps in notifiers"
+       depends on X86 || MIPS
+       default n
+       help
+         This will add an extra call back to kgdb for the breakpoint
+         exception handler on which will will allow kgdb to step
+         through a notify handler.
+
+config KGDB_KDB
+        bool "KGDB_KDB: include kdb frontend for kgdb"
+        default n
+        help
+          KDB frontend for kernel
+
+config KDB_KEYBOARD
+        bool "KGDB_KDB: keyboard as input device"
+        depends on VT && KGDB_KDB
+        default n
+        help
+          KDB can use a PS/2 type keyboard for an input device
+
 endif # KGDB
diff --git a/lib/Makefile b/lib/Makefile
index 9e6d3c29d73a..3f1062cbbff4 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,7 +21,7 @@ lib-y	+= kobject.o kref.o klist.o
 
 obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
          bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
-         string_helpers.o gcd.o lcm.o list_sort.o
+         string_helpers.o gcd.o lcm.o list_sort.o uuid.o
 
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG
@@ -85,6 +85,7 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o
 obj-$(CONFIG_SWIOTLB) += swiotlb.o
 obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
 obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
+obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
 
 lib-$(CONFIG_GENERIC_BUG) += bug.o
 
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index 65e482caf5e9..9087d71537dd 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -9,6 +9,7 @@
  * (at your option) any later version.
  */
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <asm/atomic.h>
 
 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
diff --git a/lib/bug.c b/lib/bug.c
index 300e41afbf97..f13daf435211 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -165,7 +165,7 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
                                (void *)bugaddr);
 
                 show_regs(regs);
-                add_taint(TAINT_WARN);
+                add_taint(BUG_GET_TAINT(bug));
                 return BUG_TRAP_TYPE_WARN;
         }
 
diff --git a/lib/cpu-notifier-error-inject.c b/lib/cpu-notifier-error-inject.c
new file mode 100644
index 000000000000..4dc20321b0d5
--- /dev/null
+++ b/lib/cpu-notifier-error-inject.c
@@ -0,0 +1,63 @@
+#include <linux/kernel.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+
+static int priority;
+static int cpu_up_prepare_error;
+static int cpu_down_prepare_error;
+
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify cpu notifier priority");
+
+module_param(cpu_up_prepare_error, int, 0644);
+MODULE_PARM_DESC(cpu_up_prepare_error,
+                "specify error code to inject CPU_UP_PREPARE action");
+
+module_param(cpu_down_prepare_error, int, 0644);
+MODULE_PARM_DESC(cpu_down_prepare_error,
+                "specify error code to inject CPU_DOWN_PREPARE action");
+
+static int err_inject_cpu_callback(struct notifier_block *nfb,
+                                unsigned long action, void *hcpu)
+{
+        int err = 0;
+
+        switch (action) {
+        case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
+                err = cpu_up_prepare_error;
+                break;
+        case CPU_DOWN_PREPARE:
+        case CPU_DOWN_PREPARE_FROZEN:
+                err = cpu_down_prepare_error;
+                break;
+        }
+        if (err)
+                printk(KERN_INFO "Injecting error (%d) at cpu notifier\n", err);
+
+        return notifier_from_errno(err);
+}
+
+static struct notifier_block err_inject_cpu_notifier = {
+        .notifier_call = err_inject_cpu_callback,
+};
+
+static int err_inject_init(void)
+{
+        err_inject_cpu_notifier.priority = priority;
+
+        return register_hotcpu_notifier(&err_inject_cpu_notifier);
+}
+
+static void err_inject_exit(void)
+{
+        unregister_hotcpu_notifier(&err_inject_cpu_notifier);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("CPU notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
diff --git a/lib/crc32.c b/lib/crc32.c
index bc5b936e9142..4855995fcde9 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -48,12 +48,20 @@ MODULE_LICENSE("GPL");
 #if CRC_LE_BITS == 8 || CRC_BE_BITS == 8
 
 static inline u32
-crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab)
+crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
 {
 # ifdef __LITTLE_ENDIAN
-#  define DO_CRC(x) crc = tab[(crc ^ (x)) & 255 ] ^ (crc >> 8)
+#  define DO_CRC(x) crc = tab[0][(crc ^ (x)) & 255] ^ (crc >> 8)
+#  define DO_CRC4 crc = tab[3][(crc) & 255] ^ \
+                tab[2][(crc >> 8) & 255] ^ \
+                tab[1][(crc >> 16) & 255] ^ \
+                tab[0][(crc >> 24) & 255]
 # else
-#  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
+#  define DO_CRC(x) crc = tab[0][((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
+#  define DO_CRC4 crc = tab[0][(crc) & 255] ^ \
+                tab[1][(crc >> 8) & 255] ^ \
+                tab[2][(crc >> 16) & 255] ^ \
+                tab[3][(crc >> 24) & 255]
 # endif
         const u32 *b;
         size_t    rem_len;
@@ -70,10 +78,7 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab)
         b = (const u32 *)buf;
         for (--b; len; --len) {
                 crc ^= *++b; /* use pre increment for speed */
-                DO_CRC(0);
-                DO_CRC(0);
-                DO_CRC(0);
-                DO_CRC(0);
+                DO_CRC4;
         }
         len = rem_len;
         /* And the last few bytes */
@@ -85,6 +90,7 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab)
         }
         return crc;
 #undef DO_CRC
+#undef DO_CRC4
 }
 #endif
 /**
@@ -117,7 +123,7 @@ u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
 u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
 {
 # if CRC_LE_BITS == 8
-        const u32      *tab = crc32table_le;
+        const u32      (*tab)[] = crc32table_le;
 
         crc = __cpu_to_le32(crc);
         crc = crc32_body(crc, p, len, tab);
@@ -174,7 +180,7 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
 u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
 {
 # if CRC_BE_BITS == 8
-        const u32      *tab = crc32table_be;
+        const u32      (*tab)[] = crc32table_be;
 
         crc = __cpu_to_be32(crc);
         crc = crc32_body(crc, p, len, tab);
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index d6b8b9b1abfe..3df8eb17a607 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -456,7 +456,7 @@ static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
                         __func__, (int)len);
 
         nwords = ddebug_tokenize(tmpbuf, words, MAXWORDS);
-        if (nwords < 0)
+        if (nwords <= 0)
                 return -EINVAL;
         if (ddebug_parse_query(words, nwords-1, &query))
                 return -EINVAL;
diff --git a/lib/gen_crc32table.c b/lib/gen_crc32table.c
index bea5d97df991..85d0e412a04f 100644
--- a/lib/gen_crc32table.c
+++ b/lib/gen_crc32table.c
@@ -7,8 +7,8 @@
 #define LE_TABLE_SIZE (1 << CRC_LE_BITS)
 #define BE_TABLE_SIZE (1 << CRC_BE_BITS)
 
-static uint32_t crc32table_le[LE_TABLE_SIZE];
-static uint32_t crc32table_be[BE_TABLE_SIZE];
+static uint32_t crc32table_le[4][LE_TABLE_SIZE];
+static uint32_t crc32table_be[4][BE_TABLE_SIZE];
 
 /**
  * crc32init_le() - allocate and initialize LE table data
@@ -22,12 +22,19 @@ static void crc32init_le(void)
         unsigned i, j;
         uint32_t crc = 1;
 
-        crc32table_le[0] = 0;
+        crc32table_le[0][0] = 0;
 
         for (i = 1 << (CRC_LE_BITS - 1); i; i >>= 1) {
                 crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
                 for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
-                        crc32table_le[i + j] = crc ^ crc32table_le[j];
+                        crc32table_le[0][i + j] = crc ^ crc32table_le[0][j];
+        }
+        for (i = 0; i < LE_TABLE_SIZE; i++) {
+                crc = crc32table_le[0][i];
+                for (j = 1; j < 4; j++) {
+                        crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8);
+                        crc32table_le[j][i] = crc;
+                }
         }
 }
 
@@ -39,25 +46,35 @@ static void crc32init_be(void)
         unsigned i, j;
         uint32_t crc = 0x80000000;
 
-        crc32table_be[0] = 0;
+        crc32table_be[0][0] = 0;
 
         for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
                 crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
                 for (j = 0; j < i; j++)
-                        crc32table_be[i + j] = crc ^ crc32table_be[j];
+                        crc32table_be[0][i + j] = crc ^ crc32table_be[0][j];
+        }
+        for (i = 0; i < BE_TABLE_SIZE; i++) {
+                crc = crc32table_be[0][i];
+                for (j = 1; j < 4; j++) {
+                        crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
+                        crc32table_be[j][i] = crc;
+                }
         }
 }
 
-static void output_table(uint32_t table[], int len, char *trans)
+static void output_table(uint32_t table[4][256], int len, char *trans)
 {
-        int i;
+        int i, j;
 
-        for (i = 0; i < len - 1; i++) {
-                if (i % ENTRIES_PER_LINE == 0)
-                        printf("\n");
-                printf("%s(0x%8.8xL), ", trans, table[i]);
+        for (j = 0 ; j < 4; j++) {
+                printf("{");
+                for (i = 0; i < len - 1; i++) {
+                        if (i % ENTRIES_PER_LINE == 0)
+                                printf("\n");
+                        printf("%s(0x%8.8xL), ", trans, table[j][i]);
+                }
+                printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]);
         }
-        printf("%s(0x%8.8xL)\n", trans, table[len - 1]);
 }
 
 int main(int argc, char** argv)
@@ -66,14 +83,14 @@ int main(int argc, char** argv)
 
         if (CRC_LE_BITS > 1) {
                 crc32init_le();
-                printf("static const u32 crc32table_le[] = {");
+                printf("static const u32 crc32table_le[4][256] = {");
                 output_table(crc32table_le, LE_TABLE_SIZE, "tole");
                 printf("};\n");
         }
 
         if (CRC_BE_BITS > 1) {
                 crc32init_be();
-                printf("static const u32 crc32table_be[] = {");
+                printf("static const u32 crc32table_be[4][256] = {");
                 output_table(crc32table_be, BE_TABLE_SIZE, "tobe");
                 printf("};\n");
         }
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 39af2560f765..5d7a4802c562 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -16,6 +16,24 @@ const char hex_asc[] = "0123456789abcdef";
 EXPORT_SYMBOL(hex_asc);
 
 /**
+ * hex_to_bin - convert a hex digit to its real value
+ * @ch: ascii character represents hex digit
+ *
+ * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
+ * input.
+ */
+int hex_to_bin(char ch)
+{
+        if ((ch >= '0') && (ch <= '9'))
+                return ch - '0';
+        ch = tolower(ch);
+        if ((ch >= 'a') && (ch <= 'f'))
+                return ch - 'a' + 10;
+        return -1;
+}
+EXPORT_SYMBOL(hex_to_bin);
+
+/**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
@@ -34,7 +52,7 @@ EXPORT_SYMBOL(hex_asc);
  *
  * E.g.:
  *   hex_dump_to_buffer(frame->data, frame->len, 16, 1,
- *                      linebuf, sizeof(linebuf), 1);
+ *                      linebuf, sizeof(linebuf), true);
  *
  * example output buffer:
  * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO
@@ -65,8 +83,8 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 
                 for (j = 0; j < ngroups; j++)
                         lx += scnprintf(linebuf + lx, linebuflen - lx,
-                                "%s%16.16llx", j ? " " : "",
-                                (unsigned long long)*(ptr8 + j));
+                                        "%s%16.16llx", j ? " " : "",
+                                        (unsigned long long)*(ptr8 + j));
                 ascii_column = 17 * ngroups + 2;
                 break;
         }
@@ -77,7 +95,7 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 
                 for (j = 0; j < ngroups; j++)
                         lx += scnprintf(linebuf + lx, linebuflen - lx,
-                                "%s%8.8x", j ? " " : "", *(ptr4 + j));
+                                        "%s%8.8x", j ? " " : "", *(ptr4 + j));
                 ascii_column = 9 * ngroups + 2;
                 break;
         }
@@ -88,7 +106,7 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 
                 for (j = 0; j < ngroups; j++)
                         lx += scnprintf(linebuf + lx, linebuflen - lx,
-                                "%s%4.4x", j ? " " : "", *(ptr2 + j));
+                                        "%s%4.4x", j ? " " : "", *(ptr2 + j));
                 ascii_column = 5 * ngroups + 2;
                 break;
         }
@@ -111,9 +129,10 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 
         while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
                 linebuf[lx++] = ' ';
-        for (j = 0; (j < len) && (lx + 2) < linebuflen; j++)
-                linebuf[lx++] = (isascii(ptr[j]) && isprint(ptr[j])) ? ptr[j]
-                                : '.';
+        for (j = 0; (j < len) && (lx + 2) < linebuflen; j++) {
+                ch = ptr[j];
+                linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
+        }
 nil:
         linebuf[lx++] = '\0';
 }
@@ -143,7 +162,7 @@ EXPORT_SYMBOL(hex_dump_to_buffer);
  *
  * E.g.:
  *   print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
- *              16, 1, frame->data, frame->len, 1);
+ *                  16, 1, frame->data, frame->len, true);
  *
  * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
  * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO
@@ -151,12 +170,12 @@ EXPORT_SYMBOL(hex_dump_to_buffer);
  * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.
  */
 void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
-                        int rowsize, int groupsize,
-                        const void *buf, size_t len, bool ascii)
+                    int rowsize, int groupsize,
+                    const void *buf, size_t len, bool ascii)
 {
         const u8 *ptr = buf;
         int i, linelen, remaining = len;
-        unsigned char linebuf[200];
+        unsigned char linebuf[32 * 3 + 2 + 32 + 1];
 
         if (rowsize != 16 && rowsize != 32)
                 rowsize = 16;
@@ -164,13 +183,14 @@ void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
         for (i = 0; i < len; i += rowsize) {
                 linelen = min(remaining, rowsize);
                 remaining -= rowsize;
+
                 hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
-                                linebuf, sizeof(linebuf), ascii);
+                                   linebuf, sizeof(linebuf), ascii);
 
                 switch (prefix_type) {
                 case DUMP_PREFIX_ADDRESS:
-                        printk("%s%s%*p: %s\n", level, prefix_str,
-                                (int)(2 * sizeof(void *)), ptr + i, linebuf);
+                        printk("%s%s%p: %s\n",
+                               level, prefix_str, ptr + i, linebuf);
                         break;
                 case DUMP_PREFIX_OFFSET:
                         printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
@@ -196,9 +216,9 @@ EXPORT_SYMBOL(print_hex_dump);
  * rowsize of 16, groupsize of 1, and ASCII output included.
  */
 void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
-                        const void *buf, size_t len)
+                          const void *buf, size_t len)
 {
         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1,
-                        buf, len, 1);
+                       buf, len, true);
 }
 EXPORT_SYMBOL(print_hex_dump_bytes);
diff --git a/lib/idr.c b/lib/idr.c
index 2eb1dca03681..c1a206901761 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -445,6 +445,7 @@ EXPORT_SYMBOL(idr_remove);
 void idr_remove_all(struct idr *idp)
 {
         int n, id, max;
+        int bt_mask;
         struct idr_layer *p;
         struct idr_layer *pa[MAX_LEVEL];
         struct idr_layer **paa = &pa[0];
@@ -462,8 +463,10 @@ void idr_remove_all(struct idr *idp)
                         p = p->ary[(id >> n) & IDR_MASK];
                 }
 
+                bt_mask = id;
                 id += 1 << n;
-                while (n < fls(id)) {
+                /* Get the highest bit that the above add changed from 0->1. */
+                while (n < fls(id ^ bt_mask)) {
                         if (p)
                                 free_layer(p);
                         n += IDR_BITS;
@@ -623,7 +626,7 @@ void *idr_get_next(struct idr *idp, int *nextidp)
         }
         return NULL;
 }
-
+EXPORT_SYMBOL(idr_get_next);
 
 
 /**
diff --git a/lib/kobject.c b/lib/kobject.c
index 8115eb1bbf4d..f07c57252e82 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -850,6 +850,121 @@ struct kset *kset_create_and_add(const char *name,
 }
 EXPORT_SYMBOL_GPL(kset_create_and_add);
 
+
+static DEFINE_SPINLOCK(kobj_ns_type_lock);
+static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
+
+int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
+{
+        enum kobj_ns_type type = ops->type;
+        int error;
+
+        spin_lock(&kobj_ns_type_lock);
+
+        error = -EINVAL;
+        if (type >= KOBJ_NS_TYPES)
+                goto out;
+
+        error = -EINVAL;
+        if (type <= KOBJ_NS_TYPE_NONE)
+                goto out;
+
+        error = -EBUSY;
+        if (kobj_ns_ops_tbl[type])
+                goto out;
+
+        error = 0;
+        kobj_ns_ops_tbl[type] = ops;
+
+out:
+        spin_unlock(&kobj_ns_type_lock);
+        return error;
+}
+
+int kobj_ns_type_registered(enum kobj_ns_type type)
+{
+        int registered = 0;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
+                registered = kobj_ns_ops_tbl[type] != NULL;
+        spin_unlock(&kobj_ns_type_lock);
+
+        return registered;
+}
+
+const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
+{
+        const struct kobj_ns_type_operations *ops = NULL;
+
+        if (parent && parent->ktype->child_ns_type)
+                ops = parent->ktype->child_ns_type(parent);
+
+        return ops;
+}
+
+const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
+{
+        return kobj_child_ns_ops(kobj->parent);
+}
+
+
+const void *kobj_ns_current(enum kobj_ns_type type)
+{
+        const void *ns = NULL;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+            kobj_ns_ops_tbl[type])
+                ns = kobj_ns_ops_tbl[type]->current_ns();
+        spin_unlock(&kobj_ns_type_lock);
+
+        return ns;
+}
+
+const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
+{
+        const void *ns = NULL;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+            kobj_ns_ops_tbl[type])
+                ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
+        spin_unlock(&kobj_ns_type_lock);
+
+        return ns;
+}
+
+const void *kobj_ns_initial(enum kobj_ns_type type)
+{
+        const void *ns = NULL;
+
+        spin_lock(&kobj_ns_type_lock);
+        if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+            kobj_ns_ops_tbl[type])
+                ns = kobj_ns_ops_tbl[type]->initial_ns();
+        spin_unlock(&kobj_ns_type_lock);
+
+        return ns;
+}
+
+/*
+ * kobj_ns_exit - invalidate a namespace tag
+ *
+ * @type: the namespace type (i.e. KOBJ_NS_TYPE_NET)
+ * @ns: the actual namespace being invalidated
+ *
+ * This is called when a tag is no longer valid.  For instance,
+ * when a network namespace exits, it uses this helper to
+ * make sure no sb's sysfs_info points to the now-invalidated
+ * netns.
+ */
+void kobj_ns_exit(enum kobj_ns_type type, const void *ns)
+{
+        sysfs_exit_ns(type, ns);
+}
+
+
 EXPORT_SYMBOL(kobject_get);
 EXPORT_SYMBOL(kobject_put);
 EXPORT_SYMBOL(kobject_del);
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7b48d44ced6e..59c15511d58a 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -19,18 +19,24 @@
 #include <linux/kobject.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-
+#include <linux/user_namespace.h>
 #include <linux/socket.h>
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
 #include <net/sock.h>
+#include <net/net_namespace.h>
 
 
 u64 uevent_seqnum;
 char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
 static DEFINE_SPINLOCK(sequence_lock);
-#if defined(CONFIG_NET)
-static struct sock *uevent_sock;
+#ifdef CONFIG_NET
+struct uevent_sock {
+        struct list_head list;
+        struct sock *sk;
+};
+static LIST_HEAD(uevent_sock_list);
+static DEFINE_MUTEX(uevent_sock_mutex);
 #endif
 
 /* the strings here must match the enum in include/linux/kobject.h */
@@ -77,6 +83,37 @@ out:
         return ret;
 }
 
+static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
+{
+        struct kobject *kobj = data;
+        const struct kobj_ns_type_operations *ops;
+
+        ops = kobj_ns_ops(kobj);
+        if (ops) {
+                const void *sock_ns, *ns;
+                ns = kobj->ktype->namespace(kobj);
+                sock_ns = ops->netlink_ns(dsk);
+                return sock_ns != ns;
+        }
+
+        return 0;
+}
+
+static int kobj_usermode_filter(struct kobject *kobj)
+{
+        const struct kobj_ns_type_operations *ops;
+
+        ops = kobj_ns_ops(kobj);
+        if (ops) {
+                const void *init_ns, *ns;
+                ns = kobj->ktype->namespace(kobj);
+                init_ns = ops->initial_ns();
+                return ns != init_ns;
+        }
+
+        return 0;
+}
+
 /**
  * kobject_uevent_env - send an uevent with environmental data
  *
@@ -100,6 +137,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
         u64 seq;
         int i = 0;
         int retval = 0;
+#ifdef CONFIG_NET
+        struct uevent_sock *ue_sk;
+#endif
 
         pr_debug("kobject: '%s' (%p): %s\n",
                  kobject_name(kobj), kobj, __func__);
@@ -211,7 +251,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
 
 #if defined(CONFIG_NET)
         /* send netlink message */
-        if (uevent_sock) {
+        mutex_lock(&uevent_sock_mutex);
+        list_for_each_entry(ue_sk, &uevent_sock_list, list) {
+                struct sock *uevent_sock = ue_sk->sk;
                 struct sk_buff *skb;
                 size_t len;
 
@@ -233,18 +275,21 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
                         }
 
                         NETLINK_CB(skb).dst_group = 1;
-                        retval = netlink_broadcast(uevent_sock, skb, 0, 1,
-                                                   GFP_KERNEL);
+                        retval = netlink_broadcast_filtered(uevent_sock, skb,
+                                                            0, 1, GFP_KERNEL,
+                                                            kobj_bcast_filter,
+                                                            kobj);
                         /* ENOBUFS should be handled in userspace */
                         if (retval == -ENOBUFS)
                                 retval = 0;
                 } else
                         retval = -ENOMEM;
         }
+        mutex_unlock(&uevent_sock_mutex);
 #endif
 
         /* call uevent_helper, usually only enabled during early boot */
-        if (uevent_helper[0]) {
+        if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
                 char *argv [3];
 
                 argv [0] = uevent_helper;
@@ -320,18 +365,58 @@ int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
 EXPORT_SYMBOL_GPL(add_uevent_var);
 
 #if defined(CONFIG_NET)
-static int __init kobject_uevent_init(void)
+static int uevent_net_init(struct net *net)
 {
-        uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
-                                            1, NULL, NULL, THIS_MODULE);
-        if (!uevent_sock) {
+        struct uevent_sock *ue_sk;
+
+        ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
+        if (!ue_sk)
+                return -ENOMEM;
+
+        ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT,
+                                          1, NULL, NULL, THIS_MODULE);
+        if (!ue_sk->sk) {
                 printk(KERN_ERR
                        "kobject_uevent: unable to create netlink socket!\n");
                 return -ENODEV;
         }
-        netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
+        mutex_lock(&uevent_sock_mutex);
+        list_add_tail(&ue_sk->list, &uevent_sock_list);
+        mutex_unlock(&uevent_sock_mutex);
         return 0;
 }
 
+static void uevent_net_exit(struct net *net)
+{
+        struct uevent_sock *ue_sk;
+
+        mutex_lock(&uevent_sock_mutex);
+        list_for_each_entry(ue_sk, &uevent_sock_list, list) {
+                if (sock_net(ue_sk->sk) == net)
+                        goto found;
+        }
+        mutex_unlock(&uevent_sock_mutex);
+        return;
+
+found:
+        list_del(&ue_sk->list);
+        mutex_unlock(&uevent_sock_mutex);
+
+        netlink_kernel_release(ue_sk->sk);
+        kfree(ue_sk);
+}
+
+static struct pernet_operations uevent_net_ops = {
+        .init   = uevent_net_init,
+        .exit   = uevent_net_exit,
+};
+
+static int __init kobject_uevent_init(void)
+{
+        netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
+        return register_pernet_subsys(&uevent_net_ops);
+}
+
+
 postcore_initcall(kobject_uevent_init);
 #endif
diff --git a/lib/kref.c b/lib/kref.c
index 6d19f690380b..d3d227a08a4b 100644
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -16,23 +16,13 @@
 #include <linux/slab.h>
 
 /**
- * kref_set - initialize object and set refcount to requested number.
- * @kref: object in question.
- * @num: initial reference counter
- */
-void kref_set(struct kref *kref, int num)
-{
-        atomic_set(&kref->refcount, num);
-        smp_mb();
-}
-
-/**
  * kref_init - initialize object.
  * @kref: object in question.
  */
 void kref_init(struct kref *kref)
 {
-        kref_set(kref, 1);
+        atomic_set(&kref->refcount, 1);
+        smp_mb();
 }
 
 /**
@@ -72,7 +62,6 @@ int kref_put(struct kref *kref, void (*release)(struct kref *kref))
         return 0;
 }
 
-EXPORT_SYMBOL(kref_set);
 EXPORT_SYMBOL(kref_init);
 EXPORT_SYMBOL(kref_get);
 EXPORT_SYMBOL(kref_put);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 2a087e0f9863..05da38bcc298 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -656,7 +656,7 @@ EXPORT_SYMBOL(radix_tree_next_hole);
  *
  *      Returns: the index of the hole if found, otherwise returns an index
  *      outside of the set specified (in which case 'index - return >= max_scan'
- *      will be true). In rare cases of wrap-around, LONG_MAX will be returned.
+ *      will be true). In rare cases of wrap-around, ULONG_MAX will be returned.
  *
  *      radix_tree_next_hole may be called under rcu_read_lock. However, like
  *      radix_tree_gang_lookup, this will not atomically search a snapshot of
@@ -674,7 +674,7 @@ unsigned long radix_tree_prev_hole(struct radix_tree_root *root,
                 if (!radix_tree_lookup(root, index))
                         break;
                 index--;
-                if (index == LONG_MAX)
+                if (index == ULONG_MAX)
                         break;
         }
 
diff --git a/lib/random32.c b/lib/random32.c
index 217d5c4b666d..870dc3fc0f0f 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -39,13 +39,16 @@
 #include <linux/jiffies.h>
 #include <linux/random.h>
 
-struct rnd_state {
-        u32 s1, s2, s3;
-};
-
 static DEFINE_PER_CPU(struct rnd_state, net_rand_state);
 
-static u32 __random32(struct rnd_state *state)
+/**
+ *      prandom32 - seeded pseudo-random number generator.
+ *      @state: pointer to state structure holding seeded state.
+ *
+ *      This is used for pseudo-randomness with no outside seeding.
+ *      For more random results, use random32().
+ */
+u32 prandom32(struct rnd_state *state)
 {
 #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b)
 
@@ -55,14 +58,7 @@ static u32 __random32(struct rnd_state *state)
 
         return (state->s1 ^ state->s2 ^ state->s3);
 }
-
-/*
- * Handle minimum values for seeds
- */
-static inline u32 __seed(u32 x, u32 m)
-{
-        return (x < m) ? x + m : x;
-}
+EXPORT_SYMBOL(prandom32);
 
 /**
  *      random32 - pseudo random number generator
@@ -75,7 +71,7 @@ u32 random32(void)
 {
         unsigned long r;
         struct rnd_state *state = &get_cpu_var(net_rand_state);
-        r = __random32(state);
+        r = prandom32(state);
         put_cpu_var(state);
         return r;
 }
@@ -118,12 +114,12 @@ static int __init random32_init(void)
                 state->s3 = __seed(LCG(state->s2), 15);
 
                 /* "warm it up" */
-                __random32(state);
-                __random32(state);
-                __random32(state);
-                __random32(state);
-                __random32(state);
-                __random32(state);
+                prandom32(state);
+                prandom32(state);
+                prandom32(state);
+                prandom32(state);
+                prandom32(state);
+                prandom32(state);
         }
         return 0;
 }
@@ -147,7 +143,7 @@ static int __init random32_reseed(void)
                 state->s3 = __seed(seeds[2], 15);
 
                 /* mix it in */
-                __random32(state);
+                prandom32(state);
         }
         return 0;
 }
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 5fddf720da73..a009055140ec 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -757,37 +757,6 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
 EXPORT_SYMBOL(swiotlb_sync_single_for_device);
 
 /*
- * Same as above, but for a sub-range of the mapping.
- */
-static void
-swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
-                          unsigned long offset, size_t size,
-                          int dir, int target)
-{
-        swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
-}
-
-void
-swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
-                                  unsigned long offset, size_t size,
-                                  enum dma_data_direction dir)
-{
-        swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
-                                  SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
-
-void
-swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
-                                     unsigned long offset, size_t size,
-                                     enum dma_data_direction dir)
-{
-        swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
-                                  SYNC_FOR_DEVICE);
-}
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
-
-/*
  * Map a set of buffers described by scatterlist in streaming mode for DMA.
  * This is the scatter-gather version of the above swiotlb_map_page
  * interface.  Here the scatter gather list elements are each tagged with the
diff --git a/lib/uuid.c b/lib/uuid.c
new file mode 100644
index 000000000000..8fadd7cef46c
--- /dev/null
+++ b/lib/uuid.c
@@ -0,0 +1,53 @@
+/*
+ * Unified UUID/GUID definition
+ *
+ * Copyright (C) 2009, Intel Corp.
+ *      Huang Ying <ying.huang@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/uuid.h>
+#include <linux/random.h>
+
+static void __uuid_gen_common(__u8 b[16])
+{
+        int i;
+        u32 r;
+
+        for (i = 0; i < 4; i++) {
+                r = random32();
+                memcpy(b + i * 4, &r, 4);
+        }
+        /* reversion 0b10 */
+        b[8] = (b[8] & 0x3F) | 0x80;
+}
+
+void uuid_le_gen(uuid_le *lu)
+{
+        __uuid_gen_common(lu->b);
+        /* version 4 : random generation */
+        lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
+}
+EXPORT_SYMBOL_GPL(uuid_le_gen);
+
+void uuid_be_gen(uuid_be *bu)
+{
+        __uuid_gen_common(bu->b);
+        /* version 4 : random generation */
+        bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
+}
+EXPORT_SYMBOL_GPL(uuid_be_gen);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 46d34b0b74a8..4ee19d0d3910 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -267,7 +267,8 @@ int strict_strtoll(const char *cp, unsigned int base, long long *res)
 }
 EXPORT_SYMBOL(strict_strtoll);
 
-static int skip_atoi(const char **s)
+static noinline_for_stack
+int skip_atoi(const char **s)
 {
         int i = 0;
 
@@ -287,7 +288,8 @@ static int skip_atoi(const char **s)
 /* Formats correctly any integer in [0,99999].
  * Outputs from one to five digits depending on input.
  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
-static char *put_dec_trunc(char *buf, unsigned q)
+static noinline_for_stack
+char *put_dec_trunc(char *buf, unsigned q)
 {
         unsigned d3, d2, d1, d0;
         d1 = (q>>4) & 0xf;
@@ -324,7 +326,8 @@ static char *put_dec_trunc(char *buf, unsigned q)
         return buf;
 }
 /* Same with if's removed. Always emits five digits */
-static char *put_dec_full(char *buf, unsigned q)
+static noinline_for_stack
+char *put_dec_full(char *buf, unsigned q)
 {
         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
         /* but anyway, gcc produces better code with full-sized ints */
@@ -366,7 +369,8 @@ static char *put_dec_full(char *buf, unsigned q)
         return buf;
 }
 /* No inlining helps gcc to use registers better */
-static noinline char *put_dec(char *buf, unsigned long long num)
+static noinline_for_stack
+char *put_dec(char *buf, unsigned long long num)
 {
         while (1) {
                 unsigned rem;
@@ -417,8 +421,9 @@ struct printf_spec {
         s16     precision;      /* # of digits/chars */
 };
 
-static char *number(char *buf, char *end, unsigned long long num,
-                        struct printf_spec spec)
+static noinline_for_stack
+char *number(char *buf, char *end, unsigned long long num,
+             struct printf_spec spec)
 {
         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
         static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
@@ -537,7 +542,8 @@ static char *number(char *buf, char *end, unsigned long long num,
         return buf;
 }
 
-static char *string(char *buf, char *end, const char *s, struct printf_spec spec)
+static noinline_for_stack
+char *string(char *buf, char *end, const char *s, struct printf_spec spec)
 {
         int len, i;
 
@@ -567,8 +573,9 @@ static char *string(char *buf, char *end, const char *s, struct printf_spec spec
         return buf;
 }
 
-static char *symbol_string(char *buf, char *end, void *ptr,
-                                struct printf_spec spec, char ext)
+static noinline_for_stack
+char *symbol_string(char *buf, char *end, void *ptr,
+                    struct printf_spec spec, char ext)
 {
         unsigned long value = (unsigned long) ptr;
 #ifdef CONFIG_KALLSYMS
@@ -588,8 +595,9 @@ static char *symbol_string(char *buf, char *end, void *ptr,
 #endif
 }
 
-static char *resource_string(char *buf, char *end, struct resource *res,
-                                struct printf_spec spec, const char *fmt)
+static noinline_for_stack
+char *resource_string(char *buf, char *end, struct resource *res,
+                      struct printf_spec spec, const char *fmt)
 {
 #ifndef IO_RSRC_PRINTK_SIZE
 #define IO_RSRC_PRINTK_SIZE     6
@@ -690,8 +698,9 @@ static char *resource_string(char *buf, char *end, struct resource *res,
         return string(buf, end, sym, spec);
 }
 
-static char *mac_address_string(char *buf, char *end, u8 *addr,
-                                struct printf_spec spec, const char *fmt)
+static noinline_for_stack
+char *mac_address_string(char *buf, char *end, u8 *addr,
+                         struct printf_spec spec, const char *fmt)
 {
         char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
         char *p = mac_addr;
@@ -714,7 +723,8 @@ static char *mac_address_string(char *buf, char *end, u8 *addr,
         return string(buf, end, mac_addr, spec);
 }
 
-static char *ip4_string(char *p, const u8 *addr, const char *fmt)
+static noinline_for_stack
+char *ip4_string(char *p, const u8 *addr, const char *fmt)
 {
         int i;
         bool leading_zeros = (fmt[0] == 'i');
@@ -763,7 +773,8 @@ static char *ip4_string(char *p, const u8 *addr, const char *fmt)
         return p;
 }
 
-static char *ip6_compressed_string(char *p, const char *addr)
+static noinline_for_stack
+char *ip6_compressed_string(char *p, const char *addr)
 {
         int i, j, range;
         unsigned char zerolength[8];
@@ -843,7 +854,8 @@ static char *ip6_compressed_string(char *p, const char *addr)
         return p;
 }
 
-static char *ip6_string(char *p, const char *addr, const char *fmt)
+static noinline_for_stack
+char *ip6_string(char *p, const char *addr, const char *fmt)
 {
         int i;
 
@@ -858,8 +870,9 @@ static char *ip6_string(char *p, const char *addr, const char *fmt)
         return p;
 }
 
-static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
-                             struct printf_spec spec, const char *fmt)
+static noinline_for_stack
+char *ip6_addr_string(char *buf, char *end, const u8 *addr,
+                      struct printf_spec spec, const char *fmt)
 {
         char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
 
@@ -871,8 +884,9 @@ static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
         return string(buf, end, ip6_addr, spec);
 }
 
-static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
-                             struct printf_spec spec, const char *fmt)
+static noinline_for_stack
+char *ip4_addr_string(char *buf, char *end, const u8 *addr,
+                      struct printf_spec spec, const char *fmt)
 {
         char ip4_addr[sizeof("255.255.255.255")];
 
@@ -881,8 +895,9 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
         return string(buf, end, ip4_addr, spec);
 }
 
-static char *uuid_string(char *buf, char *end, const u8 *addr,
-                         struct printf_spec spec, const char *fmt)
+static noinline_for_stack
+char *uuid_string(char *buf, char *end, const u8 *addr,
+                  struct printf_spec spec, const char *fmt)
 {
         char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
         char *p = uuid;
@@ -965,13 +980,19 @@ static char *uuid_string(char *buf, char *end, const u8 *addr,
  *             [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
  *           little endian output byte order is:
  *             [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
+ * - 'V' For a struct va_format which contains a format string * and va_list *,
+ *       call vsnprintf(->format, *->va_list).
+ *       Implements a "recursive vsnprintf".
+ *       Do not use this feature without some mechanism to verify the
+ *       correctness of the format string and va_list arguments.
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
  * pointer to the real address.
  */
-static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
-                        struct printf_spec spec)
+static noinline_for_stack
+char *pointer(const char *fmt, char *buf, char *end, void *ptr,
+              struct printf_spec spec)
 {
         if (!ptr)
                 return string(buf, end, "(null)", spec);
@@ -1009,6 +1030,10 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                 break;
         case 'U':
                 return uuid_string(buf, end, ptr, spec, fmt);
+        case 'V':
+                return buf + vsnprintf(buf, end - buf,
+                                       ((struct va_format *)ptr)->fmt,
+                                       *(((struct va_format *)ptr)->va));
         }
         spec.flags |= SMALL;
         if (spec.field_width == -1) {
@@ -1040,7 +1065,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
  * @precision: precision of a number
  * @qualifier: qualifier of a number (long, size_t, ...)
  */
-static int format_decode(const char *fmt, struct printf_spec *spec)
+static noinline_for_stack
+int format_decode(const char *fmt, struct printf_spec *spec)
 {
         const char *start = fmt;
 
@@ -1980,7 +2006,7 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
                 {
                         char *s = (char *)va_arg(args, char *);
                         if (field_width == -1)
-                                field_width = SHORT_MAX;
+                                field_width = SHRT_MAX;
                         /* first, skip leading white space in buffer */
                         str = skip_spaces(str);