From: Arnd Bergmann <>

[ 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.

Cc: Ian Abbott <>
Fixes: 85323a991d40 ("xen: arm: mandate EABI and use generic atomic 
Fixes: daa2ac80834d ("kernel.h: handle pointers to arrays better in 
Signed-off-by: Arnd Bergmann <>
Signed-off-by: Stefano Stabellini <>
Reviewed-by: Stefano Stabellini <>
Acked-by: Ian Abbott <>
Signed-off-by: Sasha Levin <>
 arch/arm/include/asm/xen/events.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/xen/events.h 
index 8b1f37bfeeec..b7aadab9b0e8 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -16,7 +16,7 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
        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))

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