hexagon: fix using plain integer as NULL pointer warning in cmpxchg

Sparse reports

    net/ipv4/inet_diag.c:1511:17: sparse: sparse: Using plain integer as NULL pointer

Due to this code calling cmpxchg on a non-integer type
struct inet_diag_handler *

    return !cmpxchg((const struct inet_diag_handler**)&inet_diag_table[type],
                    NULL, h) ? 0 : -EEXIST;

While hexagon's cmpxchg assigns an integer value to a variable of this
type.

    __typeof__(*(ptr)) __oldval = 0;

Update this assignment to cast 0 to the correct type.

The original issue is easily reproduced at head with the below block,
and is absent after this change.

    make LLVM=1 ARCH=hexagon defconfig
    make C=1 LLVM=1 ARCH=hexagon net/ipv4/inet_diag.o

Fixes: 99a70aa051d2 ("Hexagon: Add processor and system headers")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202411091538.PGSTqUBi-lkp@intel.com/
Signed-off-by: Willem de Bruijn <willemb@google.com>
Tested-by: Christian Gmeiner <cgmeiner@igalia.com>
Link: https://lore.kernel.org/r/20241203221736.282020-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>

diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h
index bf6cf5579cf45934cfce7e37635668668bd8ee19..9c58fb81f7fd67e53aafb79db68ebb1e54b4e520 100644 (file)
--- a/arch/hexagon/include/asm/cmpxchg.h
+++ b/arch/hexagon/include/asm/cmpxchg.h
@@ -56,7 +56,7 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size)
        __typeof__(ptr) __ptr = (ptr);                          \
        __typeof__(*(ptr)) __old = (old);                       \
        __typeof__(*(ptr)) __new = (new);                       \
-       __typeof__(*(ptr)) __oldval = 0;                        \
+       __typeof__(*(ptr)) __oldval = (__typeof__(*(ptr))) 0;   \
                                                                \
        asm volatile(                                           \
                "1:     %0 = memw_locked(%1);\n"                \