path: root/samples
diff options
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 /samples
parent018cbffe6819f6f8db20a0a3acd9bab9bfd667e4 (diff)
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 'samples')
1 files changed, 3 insertions, 3 deletions
diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c
index c69cbe9b2426..bd0f337afcab 100644
--- a/samples/hw_breakpoint/data_breakpoint.c
+++ b/samples/hw_breakpoint/data_breakpoint.c
@@ -34,7 +34,7 @@
#include <linux/perf_event.h>
#include <linux/hw_breakpoint.h>
-struct perf_event **sample_hbp;
+struct perf_event * __percpu *sample_hbp;
static char ksym_name[KSYM_NAME_LEN] = "pid_max";
module_param_string(ksym, ksym_name, KSYM_NAME_LEN, S_IRUGO);
@@ -61,8 +61,8 @@ static int __init hw_break_module_init(void)
sample_hbp = register_wide_hw_breakpoint(&attr, sample_hbp_handler);
- if (IS_ERR(sample_hbp)) {
- ret = PTR_ERR(sample_hbp);
+ if (IS_ERR((void __force *)sample_hbp)) {
+ ret = PTR_ERR((void __force *)sample_hbp);
goto fail;

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