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Subject[patch] dump_stack(): arch-neutral stack trace
Nicholas Miell wrote:
>
> ...
> show_trace isn't exported for modules, and (even worse) isn't even
> implemented on all architectures, IIRC.

That's right.



From Christoph Hellwig, also present in 2.4.

Create an arch-independent `dump_stack()' function. So we don't need to do

#ifdef CONFIG_X86
show_stack(0); /* No prototype in scope! */
#endif

any more.

The whole dump_stack() implementation is delegated to the architecture.
If it doesn't provide one, there is a default do-nothing library
function.




arch/alpha/kernel/traps.c | 5 +++++
arch/cris/kernel/traps.c | 6 +++++-
arch/i386/kernel/traps.c | 8 ++++++++
fs/buffer.c | 4 +---
include/linux/kernel.h | 2 ++
kernel/ksyms.c | 3 +++
lib/Makefile | 2 +-
lib/dump_stack.c | 13 +++++++++++++
8 files changed, 38 insertions(+), 5 deletions(-)

--- 2.5.34/arch/alpha/kernel/traps.c~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/arch/alpha/kernel/traps.c Mon Sep 9 12:24:43 2002
@@ -171,6 +171,11 @@ void show_stack(unsigned long *sp)
dik_show_trace(sp);
}

+void dump_stack(void)
+{
+ show_stack(NULL);
+}
+
void
die_if_kernel(char * str, struct pt_regs *regs, long err, unsigned long *r9_15)
{
--- 2.5.34/arch/cris/kernel/traps.c~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/arch/cris/kernel/traps.c Mon Sep 9 12:24:43 2002
@@ -230,8 +230,12 @@ watchdog_bite_hook(struct pt_regs *regs)
#endif
}

-/* This is normally the 'Oops' routine */
+void dump_stack(void)
+{
+ show_stack(NULL);
+}

+/* This is normally the 'Oops' routine */
void
die_if_kernel(const char * str, struct pt_regs * regs, long err)
{
--- 2.5.34/arch/i386/kernel/traps.c~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/arch/i386/kernel/traps.c Mon Sep 9 12:24:43 2002
@@ -207,6 +207,14 @@ void show_stack(unsigned long * esp)
show_trace(esp);
}

+/*
+ * The architecture-independent backtrace generator
+ */
+void dump_stack(void)
+{
+ show_stack(0);
+}
+
void show_registers(struct pt_regs *regs)
{
int i;
--- 2.5.34/fs/buffer.c~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/fs/buffer.c Mon Sep 9 12:24:43 2002
@@ -61,10 +61,8 @@ void __buffer_error(char *file, int line
return;
enough++;
printk("buffer layer error at %s:%d\n", file, line);
-#ifdef CONFIG_X86
printk("Pass this trace through ksymoops for reporting\n");
- show_stack(0);
-#endif
+ dump_stack();
}
EXPORT_SYMBOL(__buffer_error);

--- 2.5.34/include/linux/kernel.h~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/include/linux/kernel.h Mon Sep 9 12:24:43 2002
@@ -96,6 +96,8 @@ extern const char *print_tainted(void);
#define TAINT_FORCED_MODULE (1<<1)
#define TAINT_UNSAFE_SMP (1<<2)

+extern void dump_stack(void);
+
#if DEBUG
#define pr_debug(fmt,arg...) \
printk(KERN_DEBUG fmt,##arg)
--- 2.5.34/kernel/ksyms.c~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/kernel/ksyms.c Mon Sep 9 12:24:43 2002
@@ -609,3 +609,6 @@ EXPORT_SYMBOL(pidhash);
#if defined(CONFIG_SMP) && defined(__GENERIC_PER_CPU)
EXPORT_SYMBOL(__per_cpu_offset);
#endif
+
+/* debug */
+EXPORT_SYMBOL(dump_stack);
--- /dev/null Thu Aug 30 13:30:55 2001
+++ 2.5.34-akpm/lib/dump_stack.c Mon Sep 9 12:24:43 2002
@@ -0,0 +1,13 @@
+/*
+ * Provide a default dump_stack() function for architectures
+ * which don't implement their own.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+void dump_stack(void)
+{
+ printk(KERN_NOTICE
+ "This architecture does not implement dump_stack()\n");
+}
--- 2.5.34/lib/Makefile~dump-stack Mon Sep 9 12:24:43 2002
+++ 2.5.34-akpm/lib/Makefile Mon Sep 9 12:24:43 2002
@@ -12,7 +12,7 @@ export-objs := cmdline.o dec_and_lock.o
crc32.o rbtree.o radix-tree.o

obj-y := errno.o ctype.o string.o vsprintf.o brlock.o cmdline.o \
- bust_spinlocks.o rbtree.o radix-tree.o
+ bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o

obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
.
-
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