3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me 
know.

------------------

From: Larry Finger <larry.fin...@lwfinger.net>

commit 8a8c35fadfaf55629a37ef1a8ead1b8fb32581d2 upstream.

Beginning at commit d52d3997f843 ("ipv6: Create percpu rt6_info"), the
following INFO splat is logged:

  ===============================
  [ INFO: suspicious RCU usage. ]
  4.1.0-rc7-next-20150612 #1 Not tainted
  -------------------------------
  kernel/sched/core.c:7318 Illegal context switch in RCU-bh read-side critical 
section!
  other info that might help us debug this:
  rcu_scheduler_active = 1, debug_locks = 0
   3 locks held by systemd/1:
   #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff815f0c8f>] rtnetlink_rcv+0x1f/0x40
   #1:  (rcu_read_lock_bh){......}, at: [<ffffffff816a34e2>] 
ipv6_add_addr+0x62/0x540
   #2:  (addrconf_hash_lock){+...+.}, at: [<ffffffff816a3604>] 
ipv6_add_addr+0x184/0x540
  stack backtrace:
  CPU: 0 PID: 1 Comm: systemd Not tainted 4.1.0-rc7-next-20150612 #1
  Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.20   04/17/2014
  Call Trace:
    dump_stack+0x4c/0x6e
    lockdep_rcu_suspicious+0xe7/0x120
    ___might_sleep+0x1d5/0x1f0
    __might_sleep+0x4d/0x90
    kmem_cache_alloc+0x47/0x250
    create_object+0x39/0x2e0
    kmemleak_alloc_percpu+0x61/0xe0
    pcpu_alloc+0x370/0x630

Additional backtrace lines are truncated.  In addition, the above splat
is followed by several "BUG: sleeping function called from invalid
context at mm/slub.c:1268" outputs.  As suggested by Martin KaFai Lau,
these are the clue to the fix.  Routine kmemleak_alloc_percpu() always
uses GFP_KERNEL for its allocations, whereas it should follow the gfp
from its callers.

Reviewed-by: Catalin Marinas <catalin.mari...@arm.com>
Reviewed-by: Kamalesh Babulal <kamal...@linux.vnet.ibm.com>
Acked-by: Martin KaFai Lau <ka...@fb.com>
Signed-off-by: Larry Finger <larry.fin...@lwfinger.net>
Cc: Martin KaFai Lau <ka...@fb.com>
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Tejun Heo <t...@kernel.org>
Cc: Christoph Lameter <c...@linux-foundation.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
 include/linux/kmemleak.h | 6 ++++--
 mm/kmemleak.c            | 9 +++++----
 mm/percpu.c              | 2 +-
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h
index e705467..d0a1f99 100644
--- a/include/linux/kmemleak.h
+++ b/include/linux/kmemleak.h
@@ -28,7 +28,8 @@
 extern void kmemleak_init(void) __ref;
 extern void kmemleak_alloc(const void *ptr, size_t size, int min_count,
                           gfp_t gfp) __ref;
-extern void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size) __ref;
+extern void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
+                                 gfp_t gfp) __ref;
 extern void kmemleak_free(const void *ptr) __ref;
 extern void kmemleak_free_part(const void *ptr, size_t size) __ref;
 extern void kmemleak_free_percpu(const void __percpu *ptr) __ref;
@@ -71,7 +72,8 @@ static inline void kmemleak_alloc_recursive(const void *ptr, 
size_t size,
                                            gfp_t gfp)
 {
 }
-static inline void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size)
+static inline void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
+                                        gfp_t gfp)
 {
 }
 static inline void kmemleak_free(const void *ptr)
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 6691476..1f14ef6 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -907,12 +907,13 @@ EXPORT_SYMBOL_GPL(kmemleak_alloc);
  * kmemleak_alloc_percpu - register a newly allocated __percpu object
  * @ptr:       __percpu pointer to beginning of the object
  * @size:      size of the object
+ * @gfp:       flags used for kmemleak internal memory allocations
  *
  * This function is called from the kernel percpu allocator when a new object
- * (memory block) is allocated (alloc_percpu). It assumes GFP_KERNEL
- * allocation.
+ * (memory block) is allocated (alloc_percpu).
  */
-void __ref kmemleak_alloc_percpu(const void __percpu *ptr, size_t size)
+void __ref kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
+                                gfp_t gfp)
 {
        unsigned int cpu;
 
@@ -925,7 +926,7 @@ void __ref kmemleak_alloc_percpu(const void __percpu *ptr, 
size_t size)
        if (kmemleak_enabled && ptr && !IS_ERR(ptr))
                for_each_possible_cpu(cpu)
                        create_object((unsigned long)per_cpu_ptr(ptr, cpu),
-                                     size, 0, GFP_KERNEL);
+                                     size, 0, gfp);
        else if (kmemleak_early_log)
                log_early(KMEMLEAK_ALLOC_PERCPU, ptr, size, 0);
 }
diff --git a/mm/percpu.c b/mm/percpu.c
index d39e2f4..9584117 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1030,7 +1030,7 @@ area_found:
                memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
 
        ptr = __addr_to_pcpu_ptr(chunk->base_addr + off);
-       kmemleak_alloc_percpu(ptr, size);
+       kmemleak_alloc_percpu(ptr, size, gfp);
        return ptr;
 
 fail_unlock:
-- 
1.9.1

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