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authorFrederic Weisbecker <fweisbec@gmail.com>2009-11-23 14:42:33 (GMT)
committerIngo Molnar <mingo@elte.hu>2009-11-23 17:18:30 (GMT)
commitfdf6bc95229821e3d9405eba28925b76e92b74d0 (patch)
treebe414077495ac0ef3b71abd163dc35d0e96b1318 /kernel
parente6db4876575f3fdd5b1df2cbff826df95ab9af6a (diff)
downloadlinux-fdf6bc95229821e3d9405eba28925b76e92b74d0.tar.xz
hw-breakpoints: Check the breakpoint params from perf tools
Perf tools create perf events as disabled in the beginning. Breakpoints are then considered like ptrace temporary breakpoints, only meant to reserve a breakpoint slot until we get all the necessary informations from the user. In this case, we don't check the address that is breakpointed as it is NULL in the ptrace case. But perf tools don't have the same purpose, events are created disabled to wait for all events to be created before enabling all of them. We want to check the breakpoint parameters in this case. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1258987355-8751-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/hw_breakpoint.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index c166622..06d372f 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -267,7 +267,16 @@ int __register_perf_hw_breakpoint(struct perf_event *bp)
if (ret)
return ret;
- if (!bp->attr.disabled)
+ /*
+ * Ptrace breakpoints can be temporary perf events only
+ * meant to reserve a slot. In this case, it is created disabled and
+ * we don't want to check the params right now (as we put a null addr)
+ * But perf tools create events as disabled and we want to check
+ * the params for them.
+ * This is a quick hack that will be removed soon, once we remove
+ * the tmp breakpoints from ptrace
+ */
+ if (!bp->attr.disabled || bp->callback == perf_bp_event)
ret = arch_validate_hwbkpt_settings(bp, bp->ctx->task);
return ret;