Messages in this thread Patch in this message | | | Date | Mon, 8 Nov 2004 14:32:41 GMT | From | dhowells@redhat ... | Subject | [PATCH] Additional kgdb hooks |
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The attached patch adds a couple of extra hooks by which kgdb or an equivalent gdbstub can catch bad_page() and panic() invocations.
Signed-Off-By: dhowells@redhat.com --- diffstat kgdb-hooks-2610rc1mm3.diff include/asm-generic/bug.h | 8 ++++++++ kernel/panic.c | 1 + mm/page_alloc.c | 1 + 3 files changed, 10 insertions(+)
diff -uNrp /warthog/kernels/linux-2.6.10-rc1-mm3/include/asm-generic/bug.h linux-2.6.10-rc1-mm3-frv/include/asm-generic/bug.h --- /warthog/kernels/linux-2.6.10-rc1-mm3/include/asm-generic/bug.h 2004-10-19 10:42:12.000000000 +0100 +++ linux-2.6.10-rc1-mm3-frv/include/asm-generic/bug.h 2004-11-05 14:13:04.327459964 +0000 @@ -18,6 +18,10 @@ } while (0) #endif +#ifndef HAVE_ARCH_KGDB_BAD_PAGE +#define kgdb_bad_page(page) do {} while(0) +#endif + #ifndef HAVE_ARCH_BUG_ON #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0) #endif @@ -31,4 +35,8 @@ } while (0) #endif +#ifndef HAVE_ARCH_KGDB_RAISE +#define kgdb_raise(signr) do {} while(0) +#endif + #endif diff -uNrp /warthog/kernels/linux-2.6.10-rc1-mm3/kernel/panic.c linux-2.6.10-rc1-mm3-frv/kernel/panic.c --- /warthog/kernels/linux-2.6.10-rc1-mm3/kernel/panic.c 2004-11-05 13:15:51.000000000 +0000 +++ linux-2.6.10-rc1-mm3-frv/kernel/panic.c 2004-11-05 14:13:04.528442988 +0000 @@ -73,6 +73,7 @@ NORET_TYPE void panic(const char * fmt, vsnprintf(buf, sizeof(buf), fmt, args); va_end(args); printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf); + kgdb_raise(SIGABRT); bust_spinlocks(0); /* If we have crashed, perform a kexec reboot, for dump write-out */ diff -uNrp /warthog/kernels/linux-2.6.10-rc1-mm3/mm/page_alloc.c linux-2.6.10-rc1-mm3-frv/mm/page_alloc.c --- /warthog/kernels/linux-2.6.10-rc1-mm3/mm/page_alloc.c 2004-11-05 13:15:52.000000000 +0000 +++ linux-2.6.10-rc1-mm3-frv/mm/page_alloc.c 2004-11-05 14:13:04.654432347 +0000 @@ -88,6 +89,7 @@ static void bad_page(const char *functio page->mapping, page_mapcount(page), page_count(page)); printk(KERN_EMERG "Backtrace:\n"); dump_stack(); + kgdb_bad_page(page); printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n"); page->flags &= ~(1 << PG_private | 1 << PG_locked | - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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