Merge branch 'linus' into core/softlockup

Conflicts:

	kernel/softlockup.c

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

9 files changed, 126 insertions, 51 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 509ae35a9ef5..011e00bcfc30 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -443,7 +443,6 @@ config DEBUG_LOCKING_API_SELFTESTS
 
 config STACKTRACE
         bool
-        depends on DEBUG_KERNEL
         depends on STACKTRACE_SUPPORT
 
 config DEBUG_KOBJECT
@@ -587,6 +586,9 @@ 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
@@ -658,6 +660,8 @@ 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/bug.c b/lib/bug.c
index 530f38f55787..bfeafd60ee9f 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -37,6 +37,7 @@
  */
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/kernel.h>
 #include <linux/bug.h>
 #include <linux/sched.h>
 
@@ -149,6 +150,7 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
                                (void *)bugaddr);
 
                 show_regs(regs);
+                add_taint(TAINT_WARN);
                 return BUG_TRAP_TYPE_WARN;
         }
 
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index a76a5e122ae1..85b18d79be89 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -68,6 +68,7 @@ static int fill_pool(void)
 {
         gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN;
         struct debug_obj *new;
+        unsigned long flags;
 
         if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL))
                 return obj_pool_free;
@@ -81,10 +82,10 @@ static int fill_pool(void)
                 if (!new)
                         return obj_pool_free;
 
-                spin_lock(&pool_lock);
+                spin_lock_irqsave(&pool_lock, flags);
                 hlist_add_head(&new->node, &obj_pool);
                 obj_pool_free++;
-                spin_unlock(&pool_lock);
+                spin_unlock_irqrestore(&pool_lock, flags);
         }
         return obj_pool_free;
 }
@@ -110,16 +111,13 @@ static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b)
 }
 
 /*
- * Allocate a new object. If the pool is empty and no refill possible,
- * switch off the debugger.
+ * Allocate a new object. If the pool is empty, switch off the debugger.
  */
 static struct debug_obj *
 alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr)
 {
         struct debug_obj *obj = NULL;
-        int retry = 0;
 
-repeat:
         spin_lock(&pool_lock);
         if (obj_pool.first) {
                 obj         = hlist_entry(obj_pool.first, typeof(*obj), node);
@@ -141,9 +139,6 @@ repeat:
         }
         spin_unlock(&pool_lock);
 
-        if (fill_pool() && !obj && !retry++)
-                goto repeat;
-
         return obj;
 }
 
@@ -261,6 +256,8 @@ __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
         struct debug_obj *obj;
         unsigned long flags;
 
+        fill_pool();
+
         db = get_bucket((unsigned long) addr);
 
         spin_lock_irqsave(&db->lock, flags);
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/radix-tree.c b/lib/radix-tree.c
index 169a2f8dabcc..56ec21a7f73d 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2001 Momchil Velikov
  * Portions Copyright (C) 2001 Christoph Hellwig
- * Copyright (C) 2005 SGI, Christoph Lameter <clameter@sgi.com>
+ * Copyright (C) 2005 SGI, Christoph Lameter
  * Copyright (C) 2006 Nick Piggin
  *
  * This program is free software; you can redistribute it and/or
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/ts_bm.c b/lib/ts_bm.c
index d90822c378a4..4a7fce72898e 100644
--- a/lib/ts_bm.c
+++ b/lib/ts_bm.c
@@ -63,7 +63,7 @@ static unsigned int bm_find(struct ts_config *conf, struct ts_state *state)
         struct ts_bm *bm = ts_config_priv(conf);
         unsigned int i, text_len, consumed = state->offset;
         const u8 *text;
-        int shift = bm->patlen, bs;
+        int shift = bm->patlen - 1, bs;
 
         for (;;) {
                 text_len = conf->get_next_block(consumed, &text, conf, state);
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? */