* [Patch 2/3] Allow arch-specific cleanup before breakpoint unregistration
[not found] <20100512022527.857904312@linux.vnet.ibm.com>
@ 2010-05-12 3:33 ` K.Prasad
0 siblings, 0 replies; only message in thread
From: K.Prasad @ 2010-05-12 3:33 UTC (permalink / raw)
To: linuxppc-dev
Cc: David Gibson, Roland McGrath, Frederic Weisbecker,
Michael Neuling, Alan Stern, paulus, shaggy,
Benjamin Herrenschmidt, K.Prasad, Ingo Molnar,
Linux Kernel Mailing List
[-- Attachment #1: arch_unregister_hbp_02 --]
[-- Type: text/plain, Size: 1284 bytes --]
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 <prasad@linux.vnet.ibm.com>
---
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);
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