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| author | Liam Beguin <liambeguin@gmail.com> | 2020-07-18 16:10:21 -0400 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2020-07-21 08:11:12 +0200 |
| commit | b344d6a83d01c52fddbefa6b3b4764da5b1022a0 (patch) | |
| tree | 6ae12a74e0557b8e8fc13665178007b27177956b /arch/parisc/lib | |
| parent | ba47d845d715a010f7b51f6f89bae32845e6acb7 (diff) | |
| download | lwn-b344d6a83d01c52fddbefa6b3b4764da5b1022a0.tar.gz lwn-b344d6a83d01c52fddbefa6b3b4764da5b1022a0.zip | |
parisc: add support for cmpxchg on u8 pointers
The kernel test bot reported[1] that using set_mask_bits on a u8 causes
the following issue on parisc:
hppa-linux-ld: drivers/phy/ti/phy-tusb1210.o: in function `tusb1210_probe':
>> (.text+0x2f4): undefined reference to `__cmpxchg_called_with_bad_pointer'
>> hppa-linux-ld: (.text+0x324): undefined reference to `__cmpxchg_called_with_bad_pointer'
hppa-linux-ld: (.text+0x354): undefined reference to `__cmpxchg_called_with_bad_pointer'
Add support for cmpxchg on u8 pointers.
[1] https://lore.kernel.org/patchwork/patch/1272617/#1468946
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Tested-by: Dave Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/lib')
| -rw-r--r-- | arch/parisc/lib/bitops.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/parisc/lib/bitops.c b/arch/parisc/lib/bitops.c index 70ffbcf889b8..2e4d1f05a926 100644 --- a/arch/parisc/lib/bitops.c +++ b/arch/parisc/lib/bitops.c @@ -79,3 +79,15 @@ unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsign _atomic_spin_unlock_irqrestore(ptr, flags); return (unsigned long)prev; } + +u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new) +{ + unsigned long flags; + u8 prev; + + _atomic_spin_lock_irqsave(ptr, flags); + if ((prev = *ptr) == old) + *ptr = new; + _atomic_spin_unlock_irqrestore(ptr, flags); + return prev; +} |