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| author | Gao Xiang <hsiangkao@redhat.com> | 2021-04-06 07:59:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-16 12:57:48 +0300 |
| commit | 68ce97f7feb2e0c7d66989f1ff4509d7eafb4b3b (patch) | |
| tree | 27200b93a048683425c941892f2d15713cb5b733 | |
| parent | 9264bb1315cfb31a19f3693b8366f11c5b4e0082 (diff) | |
| download | linux-68ce97f7feb2e0c7d66989f1ff4509d7eafb4b3b.tar.xz | |
parisc: avoid a warning on u8 cast for cmpxchg on u8 pointers
commit 4d752e5af63753ab5140fc282929b98eaa4bd12e upstream.
commit b344d6a83d01 ("parisc: add support for cmpxchg on u8 pointers")
can generate a sparse warning ("cast truncates bits from constant
value"), which has been reported several times [1] [2] [3].
The original code worked as expected, but anyway, let silence such
sparse warning as what others did [4].
[1] https://lore.kernel.org/r/202104061220.nRMBwCXw-lkp@intel.com
[2] https://lore.kernel.org/r/202012291914.T5Agcn99-lkp@intel.com
[3] https://lore.kernel.org/r/202008210829.KVwn7Xeh%25lkp@intel.com
[4] https://lore.kernel.org/r/20210315131512.133720-2-jacopo+renesas@jmondi.org
Cc: Liam Beguin <liambeguin@gmail.com>
Cc: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.8+
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/parisc/include/asm/cmpxchg.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h index 068958575871..a736dc59bbef 100644 --- a/arch/parisc/include/asm/cmpxchg.h +++ b/arch/parisc/include/asm/cmpxchg.h @@ -72,7 +72,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) #endif case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int)old, (unsigned int)new_); - case 1: return __cmpxchg_u8((u8 *)ptr, (u8)old, (u8)new_); + case 1: return __cmpxchg_u8((u8 *)ptr, old & 0xff, new_ & 0xff); } __cmpxchg_called_with_bad_pointer(); return old; |