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>

diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h
index 536690a68917c7887d42d8760df14794c8c76a51..8dc6d198039d2db723f135b59f3127203561c6f8 100644 (file)
--- a/arch/parisc/include/asm/cmpxchg.h
+++ b/arch/parisc/include/asm/cmpxchg.h
@@ -71,7 +71,7 @@ __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;