From 608e2619682e951f525b08e7a48669a3c0263b41 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sun, 15 Jul 2007 23:41:39 -0700 Subject: 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 Acked-by: Haavard Skinnemoen Cc: Andi Kleen Cc: Kyle McMartin Cc: Paul Mackerras Cc: Paul Mundt Cc: Martin Schwidefsky Signed-off-by: Heiko Carstens Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/bug.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'lib') diff --git a/lib/bug.c b/lib/bug.c index 014b582c5c4..530f38f5578 100644 --- a/lib/bug.c +++ b/lib/bug.c @@ -38,6 +38,7 @@ #include #include #include +#include extern const struct bug_entry __start___bug_table[], __stop___bug_table[]; @@ -112,7 +113,7 @@ const struct bug_entry *find_bug(unsigned long bugaddr) return module_find_bug(bugaddr); } -enum bug_trap_type report_bug(unsigned long bugaddr) +enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs) { const struct bug_entry *bug; const char *file; @@ -147,7 +148,7 @@ enum bug_trap_type report_bug(unsigned long bugaddr) "[verbose debug info unavailable]\n", (void *)bugaddr); - dump_stack(); + show_regs(regs); return BUG_TRAP_TYPE_WARN; } -- cgit v1.2.3