This is a note to let you know that I've just added the patch titled
hexagon: fix using plain integer as NULL pointer warning in cmpxchg
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hexagon-fix-using-plain-integer-as-null-pointer-warn.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 54d168d4adde0f2a24d9b0bdef75db2ae9d18465
Author: Willem de Bruijn <willemb@xxxxxxxxxx>
Date: Tue Dec 3 17:17:34 2024 -0500
hexagon: fix using plain integer as NULL pointer warning in cmpxchg
[ 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@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202411091538.PGSTqUBi-lkp@xxxxxxxxx/
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Tested-by: Christian Gmeiner <cgmeiner@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241203221736.282020-1-willemdebruijn.kernel@xxxxxxxxx
Signed-off-by: Brian Cain <bcain@xxxxxxxxxxx>
Signed-off-by: Brian Cain <brian.cain@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h
index bf6cf5579cf45..9c58fb81f7fd6 100644
--- 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" \
