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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-01 19:17:18 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-01 19:17:18 +0200
commit99f7b025bfadd7fac5216dcfb2a08312804674c0 (patch)
treeb5318d3acc933eb21676e48e3bf7b428295347c2 /arch/x86/kernel/dumpstack_32.c
parentMerge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/ke... (diff)
parentx86, threadinfo: Redo "x86: Use inline assembler to get sp" (diff)
downloadlinux-99f7b025bfadd7fac5216dcfb2a08312804674c0.tar.xz
linux-99f7b025bfadd7fac5216dcfb2a08312804674c0.zip
Merge branch 'x86-threadinfo-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 threadinfo changes from Ingo Molnar: "The main change here is the consolidation/unification of 32 and 64 bit thread_info handling methods, from Steve Rostedt" * 'x86-threadinfo-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, threadinfo: Redo "x86: Use inline assembler to get sp" x86: Clean up dumpstack_64.c code x86: Keep thread_info on thread stack in x86_32 x86: Prepare removal of previous_esp from i386 thread_info structure x86: Nuke GET_THREAD_INFO_WITH_ESP() macro for i386 x86: Nuke the supervisor_stack field in i386 thread_info
Diffstat (limited to 'arch/x86/kernel/dumpstack_32.c')
-rw-r--r--arch/x86/kernel/dumpstack_32.c44
1 files changed, 40 insertions, 4 deletions
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index a21d49c071db..5abd4cd4230c 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -16,12 +16,35 @@
#include <asm/stacktrace.h>
+static void *is_irq_stack(void *p, void *irq)
+{
+ if (p < irq || p >= (irq + THREAD_SIZE))
+ return NULL;
+ return irq + THREAD_SIZE;
+}
+
+
+static void *is_hardirq_stack(unsigned long *stack, int cpu)
+{
+ void *irq = per_cpu(hardirq_stack, cpu);
+
+ return is_irq_stack(stack, irq);
+}
+
+static void *is_softirq_stack(unsigned long *stack, int cpu)
+{
+ void *irq = per_cpu(softirq_stack, cpu);
+
+ return is_irq_stack(stack, irq);
+}
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
{
+ const unsigned cpu = get_cpu();
int graph = 0;
+ u32 *prev_esp;
if (!task)
task = current;
@@ -39,18 +62,31 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
for (;;) {
struct thread_info *context;
+ void *end_stack;
+
+ end_stack = is_hardirq_stack(stack, cpu);
+ if (!end_stack)
+ end_stack = is_softirq_stack(stack, cpu);
- context = (struct thread_info *)
- ((unsigned long)stack & (~(THREAD_SIZE - 1)));
- bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
+ context = task_thread_info(task);
+ bp = ops->walk_stack(context, stack, bp, ops, data,
+ end_stack, &graph);
- stack = (unsigned long *)context->previous_esp;
+ /* Stop if not on irq stack */
+ if (!end_stack)
+ break;
+
+ /* The previous esp is saved on the bottom of the stack */
+ prev_esp = (u32 *)(end_stack - THREAD_SIZE);
+ stack = (unsigned long *)*prev_esp;
if (!stack)
break;
+
if (ops->stack(data, "IRQ") < 0)
break;
touch_nmi_watchdog();
}
+ put_cpu();
}
EXPORT_SYMBOL(dump_trace);