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Commit f7136c51 authored by K.Prasad's avatar K.Prasad Committed by Paul Mackerras
Browse files

hw_breakpoints: Allow arch-specific cleanup before breakpoint unregistration 



Certain architectures (such as PowerPC) have a need to clean up data
structures before a breakpoint is unregistered.  This introduces an
arch-specific hook in release_bp_slot() along with a weak definition
in the form of a stub function.

Signed-off-by: default avatarK.Prasad <prasad@linux.vnet.ibm.com>
Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 0016a4cf

kernel/hw_breakpoint.c

+12 −0
Original line number Diff line number Diff line
@@ -241,6 +241,17 @@ toggle_bp_slot(struct perf_event *bp, bool enable, enum bp_type_idx type, 
		per_cpu(nr_cpu_bp_pinned[type], bp->cpu) -= weight;

}



/*

 * 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:

 *
@@ -339,6 +350,7 @@ void release_bp_slot(struct perf_event *bp) 
{

	mutex_lock(&nr_bp_mutex);



	arch_unregister_hw_breakpoint(bp);

	__release_bp_slot(bp);



	mutex_unlock(&nr_bp_mutex);