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authorK.Prasad <prasad@linux.vnet.ibm.com>2009-06-01 22:17:06 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-06-03 00:47:00 +0400
commit62edab9056a6cf0c9207339c8892c923a5217e45 (patch)
tree2becd775fdc2a25df3daacf69d80685b251fbed9 /arch/x86/mm/kmmio.c
parent0722db015c246204044299eae3b02d18d3ca4faf (diff)
downloadlinux-62edab9056a6cf0c9207339c8892c923a5217e45.tar.xz
hw-breakpoints: reset bits in dr6 after the corresponding exception is handled
This patch resets the bit in dr6 after the corresponding exception is handled in code, so that we keep a clean track of the current virtual debug status register. [ Impact: keep track of breakpoints triggering completion ] Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'arch/x86/mm/kmmio.c')
-rw-r--r--arch/x86/mm/kmmio.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/mm/kmmio.c b/arch/x86/mm/kmmio.c
index 16ccbd77917f..11a4ad4d6253 100644
--- a/arch/x86/mm/kmmio.c
+++ b/arch/x86/mm/kmmio.c
@@ -540,8 +540,14 @@ kmmio_die_notifier(struct notifier_block *nb, unsigned long val, void *args)
struct die_args *arg = args;
if (val == DIE_DEBUG && (arg->err & DR_STEP))
- if (post_kmmio_handler(arg->err, arg->regs) == 1)
+ if (post_kmmio_handler(arg->err, arg->regs) == 1) {
+ /*
+ * Reset the BS bit in dr6 (pointed by args->err) to
+ * denote completion of processing
+ */
+ (*(unsigned long *)ERR_PTR(arg->err)) &= ~DR_STEP;
return NOTIFY_STOP;
+ }
return NOTIFY_DONE;
}