[PATCH] process: change from __backtrace to dump_stack in show_regs

Laura Abbott
2011-08-25T23:47:37Z

Currently, show_regs calls __backtrace which does
nothing if CONFIG_FRAME_POINTER is not set. Switch to
dump_stack which handles both CONFIG_FRAME_POINTER and
CONFIG_ARM_UNWIND correctly.

__backtrace is now superseded by dump_stack in general
and show_regs was the last caller so remove __backtrace
as well.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
---
arch/arm/include/asm/system.h | 1 -
arch/arm/kernel/armksyms.c | 3 ---
arch/arm/kernel/process.c | 2 +-
arch/arm/lib/backtrace.S | 6 ------
4 files changed, 1 insertions(+), 11 deletions(-)

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 832888d..4fc2edd 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -97,7 +97,6 @@ void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
#define xchg(ptr,x) \
((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

-extern asmlinkage void __backtrace(void);
extern asmlinkage void c_backtrace(unsigned long fp, int pmode);

struct mm_struct;
diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index aeef960..8e3c6f1 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -49,9 +49,6 @@ extern void __aeabi_ulcmp(void);

extern void fpundefinstr(void);

-
-EXPORT_SYMBOL(__backtrace);
-
/* platform dependent support */
EXPORT_SYMBOL(__udelay);
EXPORT_SYMBOL(__const_udelay);
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 1a347f4..fd08140 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -319,7 +319,7 @@ void show_regs(struct pt_regs * regs)
printk("\n");
printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
__show_regs(regs);
- __backtrace();
+ dump_stack();
}

ATOMIC_NOTIFIER_HEAD(thread_notify_head);
diff --git a/arch/arm/lib/backtrace.S b/arch/arm/lib/backtrace.S
index a673297..cd07b58 100644
--- a/arch/arm/lib/backtrace.S
+++ b/arch/arm/lib/backtrace.S
@@ -22,15 +22,10 @@
#define mask r7
#define offset r8

-ENTRY(__backtrace)
- mov r1, #0x10
- mov r0, fp
-
ENTRY(c_backtrace)

#if !defined(CONFIG_FRAME_POINTER) || !defined(CONFIG_PRINTK)
mov pc, lr
-ENDPROC(__backtrace)
ENDPROC(c_backtrace)
#else
stmfd sp!, {r4 - r8, lr} @ Save an extra register so we have a location...
@@ -107,7 +102,6 @@ for_each_frame: tst frame, mask @ Check for address exceptions
mov r1, frame
bl printk
no_frame: ldmfd sp!, {r4 - r8, pc}
-ENDPROC(__backtrace)
ENDPROC(c_backtrace)

.pushsection __ex_table,"a"
--
1.7.3.3