4.4-stable review patch. If anyone has any objections, please let me know.
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From: Arnd Bergmann arnd@arndb.de
[ 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 abbotti@mev.co.uk Fixes: 85323a991d40 ("xen: arm: mandate EABI and use generic atomic operations.") Fixes: daa2ac80834d ("kernel.h: handle pointers to arrays better in container_of()") Signed-off-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Stefano Stabellini sstabellini@kernel.org Reviewed-by: Stefano Stabellini sstabellini@kernel.org Acked-by: Ian Abbott abbotti@mev.co.uk Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm/include/asm/xen/events.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 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(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))