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>
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018cbffe68
Коммит
44ee63587d
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@ -66,14 +66,14 @@ register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
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perf_overflow_handler_t triggered,
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int cpu);
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extern struct perf_event **
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extern struct perf_event * __percpu *
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register_wide_hw_breakpoint(struct perf_event_attr *attr,
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perf_overflow_handler_t triggered);
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extern int register_perf_hw_breakpoint(struct perf_event *bp);
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extern int __register_perf_hw_breakpoint(struct perf_event *bp);
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extern void unregister_hw_breakpoint(struct perf_event *bp);
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extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
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extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
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extern int dbg_reserve_bp_slot(struct perf_event *bp);
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extern int dbg_release_bp_slot(struct perf_event *bp);
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@ -100,7 +100,7 @@ static inline struct perf_event *
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register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
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perf_overflow_handler_t triggered,
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int cpu) { return NULL; }
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static inline struct perf_event **
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static inline struct perf_event * __percpu *
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register_wide_hw_breakpoint(struct perf_event_attr *attr,
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perf_overflow_handler_t triggered) { return NULL; }
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static inline int
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@ -109,7 +109,7 @@ static inline int
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__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
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static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
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static inline void
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unregister_wide_hw_breakpoint(struct perf_event **cpu_events) { }
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unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
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static inline int
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reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
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static inline void release_bp_slot(struct perf_event *bp) { }
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@ -413,17 +413,17 @@ EXPORT_SYMBOL_GPL(unregister_hw_breakpoint);
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*
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* @return a set of per_cpu pointers to perf events
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*/
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struct perf_event **
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struct perf_event * __percpu *
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register_wide_hw_breakpoint(struct perf_event_attr *attr,
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perf_overflow_handler_t triggered)
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{
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struct perf_event **cpu_events, **pevent, *bp;
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struct perf_event * __percpu *cpu_events, **pevent, *bp;
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long err;
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int cpu;
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cpu_events = alloc_percpu(typeof(*cpu_events));
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if (!cpu_events)
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return ERR_PTR(-ENOMEM);
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return (void __percpu __force *)ERR_PTR(-ENOMEM);
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get_online_cpus();
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for_each_online_cpu(cpu) {
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@ -451,7 +451,7 @@ fail:
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put_online_cpus();
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free_percpu(cpu_events);
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return ERR_PTR(err);
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return (void __percpu __force *)ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
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@ -459,7 +459,7 @@ EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
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* unregister_wide_hw_breakpoint - unregister a wide breakpoint in the kernel
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* @cpu_events: the per cpu set of events to unregister
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*/
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void unregister_wide_hw_breakpoint(struct perf_event **cpu_events)
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void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events)
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{
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int cpu;
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struct perf_event **pevent;
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@ -34,7 +34,7 @@
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#include <linux/perf_event.h>
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#include <linux/hw_breakpoint.h>
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struct perf_event **sample_hbp;
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struct perf_event * __percpu *sample_hbp;
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static char ksym_name[KSYM_NAME_LEN] = "pid_max";
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module_param_string(ksym, ksym_name, KSYM_NAME_LEN, S_IRUGO);
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@ -61,8 +61,8 @@ static int __init hw_break_module_init(void)
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attr.bp_type = HW_BREAKPOINT_W | HW_BREAKPOINT_R;
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sample_hbp = register_wide_hw_breakpoint(&attr, sample_hbp_handler);
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if (IS_ERR(sample_hbp)) {
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ret = PTR_ERR(sample_hbp);
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if (IS_ERR((void __force *)sample_hbp)) {
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ret = PTR_ERR((void __force *)sample_hbp);
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goto fail;
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}
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