Patch "xen: avoid type warning in xchg_xen_ulong" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

xen: avoid type warning in xchg_xen_ulong

to the 4.9-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:
xen-avoid-type-warning-in-xchg_xen_ulong.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Arnd Bergmann <[email protected]>
Date: Thu, 8 Jun 2017 10:53:10 +0200
Subject: xen: avoid type warning in xchg_xen_ulong

From: Arnd Bergmann <[email protected]>

[ Upstream commit 9cc91f212111cdcbefa02dcdb7dd443f224bf52c ]

The improved type-checking version of container_of() triggers a warning for xchg_xen_ulong, pointing out that 'xen_ulong_t' is unsigned, but atomic64_t contains a signed value:

drivers/xen/events/events_2l.c: In function 'evtchn_2l_handle_events':
drivers/xen/events/events_2l.c:187:1020: error: call to '__compiletime_assert_187' declared with attribute error: pointer type mismatch in container_of()

This adds a cast to work around the warning.

---
 arch/arm/include/asm/xen/events.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -16,7 +16,7 @@ static inline int xen_irqs_disabled(stru
 	return raw_irqs_disabled_flags(regs->ARM_cpsr);
 }
 
-#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((ptr),	\
+#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((long long*)(ptr),\
 							    atomic64_t,	\
 							    counter), (val))
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/net-mlx5-avoid-build-warning-for-uniprocessor.patch queue-4.9/xen-avoid-type-warning-in-xchg_xen_ulong.patch