On May 7, 2020 12:44:44 AM PDT, David Laight <david.lai...@aculab.com> wrote:
>From: Brian Gerst
>> Sent: 07 May 2020 07:18
>...
>> > --- a/arch/x86/include/asm/bitops.h
>> > +++ b/arch/x86/include/asm/bitops.h
>> > @@ -54,7 +54,7 @@ arch_set_bit(long nr, volatile unsigned long
>*addr)
>> > if (__builtin_constant_p(nr)) {
>> > asm volatile(LOCK_PREFIX "orb %1,%0"
>> > : CONST_MASK_ADDR(nr, addr)
>> > - : "iq" (CONST_MASK(nr) & 0xff)
>> > + : "iq" ((u8)(CONST_MASK(nr) & 0xff))
>>
>> I think a better fix would be to make CONST_MASK() return a u8 value
>> rather than have to cast on every use.
>
>Or assign to a local variable - then it doesn't matter how
>the value is actually calculated. So:
> u8 mask = CONST_MASK(nr);
> asm volatile(LOCK_PREFIX "orb %1,%0"
> : CONST_MASK_ADDR(nr, addr)
> : "iq" mask
>
> David
>
>-
>Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes,
>MK1 1PT, UK
>Registration No: 1397386 (Wales)
"const u8" please...
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
