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authorKeshavamurthy Anil S <anil.s.keshavamurthy@intel.com>2006-09-25 16:32:20 -0700
committerTony Luck <tony.luck@intel.com>2006-09-26 11:33:32 -0700
commitfd32cb3a9c9f9399421408e8734cd8a6d9d1a09f (patch)
treed030d93f169bd9ff39019dacc8f5b3c5a828b079 /arch/ia64
parent214ddde2f95037e129eff7e895869771719c7c1b (diff)
downloadop-kernel-dev-fd32cb3a9c9f9399421408e8734cd8a6d9d1a09f.zip
op-kernel-dev-fd32cb3a9c9f9399421408e8734cd8a6d9d1a09f.tar.gz
[IA64] kprobes: fixup the pagefault exception caused by probehandlers
If the user-specified kprobe handler causes the page fault when accessing user space address, fixup this fault since do_page_fault() should not continue as the kprobe handler are run with preemption disabled. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/kprobes.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 320cb7a..169ec3a 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -771,6 +771,12 @@ static int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr)
*/
if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
return 1;
+ /*
+ * In case the user-specified fault handler returned
+ * zero, try to fix up.
+ */
+ if (ia64_done_with_exception(regs))
+ return 1;
/*
* Let ia64_do_page_fault() fix it.
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