Merge branch 'linus' into cpus4096

Conflicts:

	arch/x86/xen/smp.c
	kernel/sched_rt.c
	net/iucv/iucv.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>

6 files changed, 136 insertions, 41 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d2099f41aa1e..df27132a56f4 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -419,7 +419,6 @@ config DEBUG_LOCKING_API_SELFTESTS
 
 config STACKTRACE
         bool
-        depends on DEBUG_KERNEL
         depends on STACKTRACE_SUPPORT
 
 config DEBUG_KOBJECT
@@ -531,16 +530,34 @@ config BOOT_PRINTK_DELAY
 config RCU_TORTURE_TEST
         tristate "torture tests for RCU"
         depends on DEBUG_KERNEL
-        depends on m
         default n
         help
           This option provides a kernel module that runs torture tests
           on the RCU infrastructure.  The kernel module may be built
           after the fact on the running kernel to be tested, if desired.
 
+          Say Y here if you want RCU torture tests to be built into
+          the kernel.
           Say M if you want the RCU torture tests to build as a module.
           Say N if you are unsure.
 
+config RCU_TORTURE_TEST_RUNNABLE
+        bool "torture tests for RCU runnable by default"
+        depends on RCU_TORTURE_TEST = y
+        default n
+        help
+          This option provides a way to build the RCU torture tests
+          directly into the kernel without them starting up at boot
+          time.  You can use /proc/sys/kernel/rcutorture_runnable
+          to manually override this setting.  This /proc file is
+          available only when the RCU torture tests have been built
+          into the kernel.
+
+          Say Y here if you want the RCU torture tests to start during
+          boot (you probably don't).
+          Say N here if you want the RCU torture tests to start only
+          after being manually enabled via /proc.
+
 config KPROBES_SANITY_TEST
         bool "Kprobes sanity tests"
         depends on DEBUG_KERNEL
@@ -563,6 +580,9 @@ config BACKTRACE_SELF_TEST
           for distributions or general kernels, but only for kernel
           developers working on architecture code.
 
+          Note that if you want to also test saved backtraces, you will
+          have to enable STACKTRACE as well.
+
           Say N if you are unsure.
 
 config LKDTM
@@ -634,6 +654,8 @@ config LATENCYTOP
           Enable this option if you want to use the LatencyTOP tool
           to find out which userspace is blocking on what kernel operations.
 
+source kernel/trace/Kconfig
+
 config PROVIDE_OHCI1394_DMA_INIT
         bool "Remote debugging over FireWire early on boot"
         depends on PCI && X86
diff --git a/lib/Makefile b/lib/Makefile
index 74b0cfb1fcc3..4b836a53c08f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -8,6 +8,15 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
          sha1.o irq_regs.o reciprocal_div.o argv_split.o \
          proportions.o prio_heap.o ratelimit.o
 
+ifdef CONFIG_FTRACE
+# Do not profile string.o, since it may be used in early boot or vdso
+CFLAGS_REMOVE_string.o = -pg
+# Also do not profile any debug utilities
+CFLAGS_REMOVE_spinlock_debug.o = -pg
+CFLAGS_REMOVE_list_debug.o = -pg
+CFLAGS_REMOVE_debugobjects.o = -pg
+endif
+
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
 
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 119174494cb5..4a8ba4bf5f6f 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add);
  * Add up all the per-cpu counts, return the result.  This is a more accurate
  * but much slower version of percpu_counter_read_positive()
  */
-s64 __percpu_counter_sum(struct percpu_counter *fbc)
+s64 __percpu_counter_sum(struct percpu_counter *fbc, int set)
 {
         s64 ret;
         int cpu;
@@ -62,7 +62,12 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc)
         for_each_online_cpu(cpu) {
                 s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
                 ret += *pcount;
+                if (set)
+                        *pcount = 0;
         }
+        if (set)
+                fbc->count = ret;
+
         spin_unlock(&fbc->lock);
         return ret;
 }
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 6c90fb90e19c..3b4dc098181e 100644
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -7,7 +7,7 @@
 #include <linux/kallsyms.h>
 #include <linux/sched.h>
 
-unsigned int debug_smp_processor_id(void)
+notrace unsigned int debug_smp_processor_id(void)
 {
         unsigned long preempt_count = preempt_count();
         int this_cpu = raw_smp_processor_id();
@@ -37,7 +37,7 @@ unsigned int debug_smp_processor_id(void)
         /*
          * Avoid recursion:
          */
-        preempt_disable();
+        preempt_disable_notrace();
 
         if (!printk_ratelimit())
                 goto out_enable;
@@ -49,7 +49,7 @@ unsigned int debug_smp_processor_id(void)
         dump_stack();
 
 out_enable:
-        preempt_enable_no_resched();
+        preempt_enable_no_resched_notrace();
 out:
         return this_cpu;
 }
diff --git a/lib/textsearch.c b/lib/textsearch.c
index be8bda3862f5..a3e500ad51d7 100644
--- a/lib/textsearch.c
+++ b/lib/textsearch.c
@@ -97,6 +97,7 @@
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/init.h>
+#include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/err.h>
 #include <linux/textsearch.h>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 6021757a4496..1dc2d1d18fa8 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -22,6 +22,8 @@
 #include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/kernel.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
 
 #include <asm/page.h>           /* for PAGE_SIZE */
 #include <asm/div64.h>
@@ -482,6 +484,89 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
         return buf;
 }
 
+static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags)
+{
+        int len, i;
+
+        if ((unsigned long)s < PAGE_SIZE)
+                s = "<NULL>";
+
+        len = strnlen(s, precision);
+
+        if (!(flags & LEFT)) {
+                while (len < field_width--) {
+                        if (buf < end)
+                                *buf = ' ';
+                        ++buf;
+                }
+        }
+        for (i = 0; i < len; ++i) {
+                if (buf < end)
+                        *buf = *s;
+                ++buf; ++s;
+        }
+        while (len < field_width--) {
+                if (buf < end)
+                        *buf = ' ';
+                ++buf;
+        }
+        return buf;
+}
+
+static inline void *dereference_function_descriptor(void *ptr)
+{
+#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
+        void *p;
+        if (!probe_kernel_address(ptr, p))
+                ptr = p;
+#endif
+        return ptr;
+}
+
+static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+{
+        unsigned long value = (unsigned long) ptr;
+#ifdef CONFIG_KALLSYMS
+        char sym[KSYM_SYMBOL_LEN];
+        sprint_symbol(sym, value);
+        return string(buf, end, sym, field_width, precision, flags);
+#else
+        field_width = 2*sizeof(void *);
+        flags |= SPECIAL | SMALL | ZEROPAD;
+        return number(buf, end, value, 16, field_width, precision, flags);
+#endif
+}
+
+/*
+ * Show a '%p' thing.  A kernel extension is that the '%p' is followed
+ * by an extra set of alphanumeric characters that are extended format
+ * specifiers.
+ *
+ * Right now we just handle 'F' (for symbolic Function descriptor pointers)
+ * and 'S' (for Symbolic direct pointers), but this can easily be
+ * extended in the future (network address types etc).
+ *
+ * The difference between 'S' and 'F' is that on ia64 and ppc64 function
+ * pointers are really function descriptors, which contain a pointer the
+ * real address. 
+ */
+static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+{
+        switch (*fmt) {
+        case 'F':
+                ptr = dereference_function_descriptor(ptr);
+                /* Fallthrough */
+        case 'S':
+                return symbol_string(buf, end, ptr, field_width, precision, flags);
+        }
+        flags |= SMALL;
+        if (field_width == -1) {
+                field_width = 2*sizeof(void *);
+                flags |= ZEROPAD;
+        }
+        return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags);
+}
+
 /**
  * vsnprintf - Format a string and place it in a buffer
  * @buf: The buffer to place the result into
@@ -502,11 +587,9 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
  */
 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 {
-        int len;
         unsigned long long num;
-        int i, base;
+        int base;
         char *str, *end, c;
-        const char *s;
 
         int flags;              /* flags to number() */
 
@@ -622,43 +705,18 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
                                 continue;
 
                         case 's':
-                                s = va_arg(args, char *);
-                                if ((unsigned long)s < PAGE_SIZE)
-                                        s = "<NULL>";
-
-                                len = strnlen(s, precision);
-
-                                if (!(flags & LEFT)) {
-                                        while (len < field_width--) {
-                                                if (str < end)
-                                                        *str = ' ';
-                                                ++str;
-                                        }
-                                }
-                                for (i = 0; i < len; ++i) {
-                                        if (str < end)
-                                                *str = *s;
-                                        ++str; ++s;
-                                }
-                                while (len < field_width--) {
-                                        if (str < end)
-                                                *str = ' ';
-                                        ++str;
-                                }
+                                str = string(str, end, va_arg(args, char *), field_width, precision, flags);
                                 continue;
 
                         case 'p':
-                                flags |= SMALL;
-                                if (field_width == -1) {
-                                        field_width = 2*sizeof(void *);
-                                        flags |= ZEROPAD;
-                                }
-                                str = number(str, end,
-                                                (unsigned long) va_arg(args, void *),
-                                                16, field_width, precision, flags);
+                                str = pointer(fmt+1, str, end,
+                                                va_arg(args, void *),
+                                                field_width, precision, flags);
+                                /* Skip all alphanumeric pointer suffixes */
+                                while (isalnum(fmt[1]))
+                                        fmt++;
                                 continue;
 
-
                         case 'n':
                                 /* FIXME:
                                 * What does C99 say about the overflow case here? */