percpu: add __percpu sparse annotations to core kernel subsystems

Add __percpu sparse annotations to core subsystems.

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.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-mm@kvack.org
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Biederman <ebiederm@xmission.com>

7 files changed, 8 insertions, 8 deletions

diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 3b73b9992b26..416bf62d6d46 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -150,8 +150,8 @@ struct blk_user_trace_setup {
 struct blk_trace {
         int trace_state;
         struct rchan *rchan;
-        unsigned long *sequence;
-        unsigned char *msg_data;
+        unsigned long __percpu *sequence;
+        unsigned char __percpu *msg_data;
         u16 act_mask;
         u64 start_lba;
         u64 end_lba;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 9717081c75ad..56b50514ab25 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -101,7 +101,7 @@ struct hd_struct {
         unsigned long stamp;
         int in_flight[2];
 #ifdef  CONFIG_SMP
-        struct disk_stats *dkstats;
+        struct disk_stats __percpu *dkstats;
 #else
         struct disk_stats dkstats;
 #endif
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index c356b6914ffd..03e8e8dbc577 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -199,7 +199,7 @@ extern struct kimage *kexec_crash_image;
  */
 extern struct resource crashk_res;
 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
-extern note_buf_t *crash_notes;
+extern note_buf_t __percpu *crash_notes;
 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 extern size_t vmcoreinfo_size;
 extern size_t vmcoreinfo_max_size;
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 7874201a3556..41acd4bf7664 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -301,7 +301,7 @@ struct zone {
         unsigned long           min_unmapped_pages;
         unsigned long           min_slab_pages;
 #endif
-        struct per_cpu_pageset  *pageset;
+        struct per_cpu_pageset __percpu *pageset;
         /*
          * free areas of different sizes
          */
diff --git a/include/linux/module.h b/include/linux/module.h
index 7e74ae0051cc..dd618eb026aa 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -365,7 +365,7 @@ struct module
 
         struct module_ref {
                 int count;
-        } *refptr;
+        } __percpu *refptr;
 #endif
 
 #ifdef CONFIG_CONSTRUCTORS
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
index a7684a513994..9bd103c844ee 100644
--- a/include/linux/percpu_counter.h
+++ b/include/linux/percpu_counter.h
@@ -21,7 +21,7 @@ struct percpu_counter {
 #ifdef CONFIG_HOTPLUG_CPU
         struct list_head list;  /* All percpu_counters are on a list */
 #endif
-        s32 *counters;
+        s32 __percpu *counters;
 };
 
 extern int percpu_counter_batch;
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 4765d97dcafb..41eedccc962c 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -33,7 +33,7 @@ struct srcu_struct_array {
 
 struct srcu_struct {
         int completed;
-        struct srcu_struct_array *per_cpu_ref;
+        struct srcu_struct_array __percpu *per_cpu_ref;
         struct mutex mutex;
 };