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Subject[PATCH] Additional kgdb hooks
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 |
-
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