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| author | Luca Barbieri <luca@luca-barbieri.com> | 2010-01-16 10:39:30 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-01-17 08:01:44 +0100 |
| commit | 0bb7a95f5455cd87e6a69e5818bc1f509a98d187 (patch) | |
| tree | 23c3e35c8300fc07d469a1875daf0be29cc37588 /arch/x86/mm | |
| parent | 8f06d7e6e1bbfb32698d6d455583ab7460c090e2 (diff) | |
| download | linux-0bb7a95f5455cd87e6a69e5818bc1f509a98d187.tar.bz2 | |
hw-breakpoints, perf: Fix broken mmiotrace due to dr6 by reference change
Commit 62edab9056a6cf0c9207339c8892c923a5217e45 (from June 2009
but merged in 2.6.33) changes notify_die to pass dr6 by
reference.
However, it forgets to fix the check for DR_STEP in kmmio.c,
breaking mmiotrace. It also passes a wrong value to the post
handler.
This simple fix makes mmiotrace work again.
Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
Acked-by: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1263634770-14578-1-git-send-email-luca@luca-barbieri.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/kmmio.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/mm/kmmio.c b/arch/x86/mm/kmmio.c index c0f6198565eb..536fb6823366 100644 --- a/arch/x86/mm/kmmio.c +++ b/arch/x86/mm/kmmio.c @@ -538,14 +538,15 @@ static int kmmio_die_notifier(struct notifier_block *nb, unsigned long val, void *args) { struct die_args *arg = args; + unsigned long* dr6_p = (unsigned long *)ERR_PTR(arg->err); - if (val == DIE_DEBUG && (arg->err & DR_STEP)) - if (post_kmmio_handler(arg->err, arg->regs) == 1) { + if (val == DIE_DEBUG && (*dr6_p & DR_STEP)) + if (post_kmmio_handler(*dr6_p, 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; + *dr6_p &= ~DR_STEP; return NOTIFY_STOP; } |