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authorTejun Heo <tj@kernel.org>2010-02-17 10:50:50 +0900
committerFrederic Weisbecker <fweisbec@gmail.com>2010-02-27 16:23:39 +0100
commit44ee63587dce85593c22497140db16f4e5027860 (patch)
tree0b3d45f9755080f1c7362a8a2eb69e326b0e2f85 /kernel
parent018cbffe6819f6f8db20a0a3acd9bab9bfd667e4 (diff)
downloadblackbird-op-linux-44ee63587dce85593c22497140db16f4e5027860.tar.gz
blackbird-op-linux-44ee63587dce85593c22497140db16f4e5027860.zip
percpu: Add __percpu sparse annotations to hw_breakpoint
Add __percpu sparse annotations to hw_breakpoint. These annotations are to make sparse consider percpu variables to be in a different address space and warn if accessed without going through percpu accessors. This patch doesn't affect normal builds. In kernel/hw_breakpoint.c, per_cpu(nr_task_bp_pinned, cpu)'s will trigger spurious noderef related warnings from sparse. Changing it to &per_cpu(nr_task_bp_pinned[0], cpu) will work around the problem but deemed to ugly by the maintainer. Leave it alone until better solution can be found. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: K.Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <4B7B4B7A.9050902@kernel.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/hw_breakpoint.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 967e66143e11..6542eacb3fa5 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -413,17 +413,17 @@ EXPORT_SYMBOL_GPL(unregister_hw_breakpoint);
*
* @return a set of per_cpu pointers to perf events
*/
-struct perf_event **
+struct perf_event * __percpu *
register_wide_hw_breakpoint(struct perf_event_attr *attr,
perf_overflow_handler_t triggered)
{
- struct perf_event **cpu_events, **pevent, *bp;
+ struct perf_event * __percpu *cpu_events, **pevent, *bp;
long err;
int cpu;
cpu_events = alloc_percpu(typeof(*cpu_events));
if (!cpu_events)
- return ERR_PTR(-ENOMEM);
+ return (void __percpu __force *)ERR_PTR(-ENOMEM);
get_online_cpus();
for_each_online_cpu(cpu) {
@@ -451,7 +451,7 @@ fail:
put_online_cpus();
free_percpu(cpu_events);
- return ERR_PTR(err);
+ return (void __percpu __force *)ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
@@ -459,7 +459,7 @@ EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
* unregister_wide_hw_breakpoint - unregister a wide breakpoint in the kernel
* @cpu_events: the per cpu set of events to unregister
*/
-void unregister_wide_hw_breakpoint(struct perf_event **cpu_events)
+void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events)
{
int cpu;
struct perf_event **pevent;
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