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    Subject[PATCH AUTOSEL for 3.18 008/101] xen: avoid type warning in xchg_xen_ulong
    Date
    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>
    ---
    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 b/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))

    --
    2.15.1
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