[Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

[Ingo Molnar <mingo@xxxxxxx>]

* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

> Jeremy Fitzhardinge wrote:
>> Linus Torvalds wrote:
>>   
>>> On Fri, 20 Jun 2008, Ingo Molnar wrote:
>>>       
>>>> okay - Jeremy, could you try the fix below? (or tip/master, i just  
>>>> pushed this out)
>>>>           
>>> Actually, don't try that one.
>>>
>>> It needs to be a _byte_ registers, so "ir" was wrong. You need "iq".
>>>       
>>
>> Doesn't work, unfortunately:
>> {standard input}:20511: Error: Incorrect register `%eax' used with `b'  
>> suffix
>>
>>         lock; orb %eax,1(%rdi)  # tmp64,
>>   
>
> This does work:
>
>                asm volatile(LOCK_PREFIX "orb %1,%0"
>                        : CONST_MASK_ADDR(nr, addr)
>                        : "iq" ((u8)CONST_MASK(nr))
>                        : "memory");
>
> (ie, explicitly casting the mask to u8)

ok, i've pushed out the fix with this.

        Ingo

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