[Patch 2/3] Allow arch-specific cleanup before breakpoint unregistration
From: K.Prasad <hidden>
Date: 2010-05-12 03:33:27
Also in:
lkml
Certain architectures (such as PowerPC Book III S) have a need to cleanup data-structures before the breakpoint is unregistered. This patch introduces an arch-specific hook in release_bp_slot() along with a weak definition in the form of a stub funciton. Signed-off-by: K.Prasad <redacted> --- kernel/hw_breakpoint.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) Index: linux-2.6.ppc64_test/kernel/hw_breakpoint.c ===================================================================
--- linux-2.6.ppc64_test.orig/kernel/hw_breakpoint.c
+++ linux-2.6.ppc64_test/kernel/hw_breakpoint.c@@ -203,6 +203,17 @@ static void toggle_bp_slot(struct perf_e } /* + * Function to perform processor-specific cleanup during unregistration + */ +__weak void arch_unregister_hw_breakpoint(struct perf_event *bp) +{ + /* + * A weak stub function here for those archs that don't define + * it inside arch/.../kernel/hw_breakpoint.c + */ +} + +/* * Contraints to check before allowing this new breakpoint counter: * * == Non-pinned counter == (Considered as pinned for now)
@@ -280,6 +291,7 @@ void release_bp_slot(struct perf_event * { mutex_lock(&nr_bp_mutex); + arch_unregister_hw_breakpoint(bp); __release_bp_slot(bp); mutex_unlock(&nr_bp_mutex);