5.15-stable review patch. If anyone has any objections, please let me know.
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From: Willem de Bruijn willemb@google.com
[ Upstream commit 8a20030038742b9915c6d811a4e6c14b126cafb4 ]
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@gmai... Signed-off-by: Brian Cain bcain@quicinc.com Signed-off-by: Brian Cain brian.cain@oss.qualcomm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/hexagon/include/asm/cmpxchg.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h index cdb705e1496af..72c6e16c3f237 100644 --- a/arch/hexagon/include/asm/cmpxchg.h +++ b/arch/hexagon/include/asm/cmpxchg.h @@ -56,7 +56,7 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, __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" \