This is a note to let you know that I've just added the patch titled
kernel: Fix sparse warning for ACCESS_ONCE
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kernel-fix-sparse-warning-for-access_once.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c5b19946eb76c67566aae6a84bf2b10ad59295ea Mon Sep 17 00:00:00 2001
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Date: Mon, 12 Jan 2015 12:13:39 +0100
Subject: kernel: Fix sparse warning for ACCESS_ONCE
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
commit c5b19946eb76c67566aae6a84bf2b10ad59295ea upstream.
Commit 927609d622a3 ("kernel: tighten rules for ACCESS ONCE") results in
sparse warnings like "Using plain integer as NULL pointer" - Let's add a
type cast to the dummy assignment.
To avoid warnings lik "sparse: warning: cast to restricted __hc32" we also
use __force on that cast.
Fixes: 927609d622a3 ("kernel: tighten rules for ACCESS ONCE")
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -461,7 +461,7 @@ static __always_inline void __write_once
* If possible use READ_ONCE/ASSIGN_ONCE instead.
*/
#define __ACCESS_ONCE(x) ({ \
- __maybe_unused typeof(x) __var = 0; \
+ __maybe_unused typeof(x) __var = (__force typeof(x)) 0; \
(volatile typeof(x) *)&(x); })
#define ACCESS_ONCE(x) (*__ACCESS_ONCE(x))
Patches currently in stable-queue which might be from borntraeger@xxxxxxxxxx are
queue-3.19/x86-spinlocks-paravirt-fix-memory-corruption-on-unlock.patch
queue-3.19/kernel-make-read_once-valid-on-const-arguments.patch
queue-3.19/kvm-s390-base-hrtimer-on-a-monotonic-clock.patch
queue-3.19/kernel-tighten-rules-for-access-once.patch
queue-3.19/kvm-s390-floating-irqs-fix-user-triggerable-endless-loop.patch
queue-3.19/kvm-s390-forward-hrtimer-if-guest-ckc-not-pending-yet.patch
queue-3.19/kernel-fix-sparse-warning-for-access_once.patch
queue-3.19/kvm-s390-avoid-memory-leaks-if-__inject_vm-fails.patch
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