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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-07-16 02:41:39 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 12:05:51 -0400
commit608e2619682e951f525b08e7a48669a3c0263b41 (patch)
tree034ec1a626c776da201c6664a0ac8b2ec0934167 /include/linux/bug.h
parent94bed2a9c4ae980838003f5d32681eef794ecc28 (diff)
generic bug: use show_regs() instead of dump_stack()
The current generic bug implementation has a call to dump_stack() in case a WARN_ON(whatever) gets hit. Since report_bug(), which calls dump_stack(), gets called from an exception handler we can do better: just pass the pt_regs structure to report_bug() and pass it to show_regs() in case of a warning. This will give more debug informations like register contents, etc... In addition this avoids some pointless lines that dump_stack() emits, since it includes a stack backtrace of the exception handler which is of no interest in case of a warning. E.g. on s390 the following lines are currently always present in a stack backtrace if dump_stack() gets called from report_bug(): [<000000000001517a>] show_trace+0x92/0xe8) [<0000000000015270>] show_stack+0xa0/0xd0 [<00000000000152ce>] dump_stack+0x2e/0x3c [<0000000000195450>] report_bug+0x98/0xf8 [<0000000000016cc8>] illegal_op+0x1fc/0x21c [<00000000000227d6>] sysc_return+0x0/0x10 Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Andi Kleen <ak@suse.de> Cc: Kyle McMartin <kyle@parisc-linux.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/bug.h')
-rw-r--r--include/linux/bug.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/bug.h b/include/linux/bug.h
index 42aa0a54b6f4..54398d2c6d8d 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -10,6 +10,8 @@ enum bug_trap_type {
10 BUG_TRAP_TYPE_BUG = 2, 10 BUG_TRAP_TYPE_BUG = 2,
11}; 11};
12 12
13struct pt_regs;
14
13#ifdef CONFIG_GENERIC_BUG 15#ifdef CONFIG_GENERIC_BUG
14#include <asm-generic/bug.h> 16#include <asm-generic/bug.h>
15 17
@@ -20,7 +22,7 @@ static inline int is_warning_bug(const struct bug_entry *bug)
20 22
21const struct bug_entry *find_bug(unsigned long bugaddr); 23const struct bug_entry *find_bug(unsigned long bugaddr);
22 24
23enum bug_trap_type report_bug(unsigned long bug_addr); 25enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
24 26
25int module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *, 27int module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
26 struct module *); 28 struct module *);
@@ -31,7 +33,8 @@ int is_valid_bugaddr(unsigned long addr);
31 33
32#else /* !CONFIG_GENERIC_BUG */ 34#else /* !CONFIG_GENERIC_BUG */
33 35
34static inline enum bug_trap_type report_bug(unsigned long bug_addr) 36static inline enum bug_trap_type report_bug(unsigned long bug_addr,
37 struct pt_regs *regs)
35{ 38{
36 return BUG_TRAP_TYPE_BUG; 39 return BUG_TRAP_TYPE_BUG;
37} 40}