linux-kernel - Re: [PATCH 2/5] Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code

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Message-ID: <386072610811182344p50f5d644qe6d415fe0bc5a017@mail.gmail.com>
Date:	Wed, 19 Nov 2008 15:44:47 +0800
From:	"Bryan Wu" <cooloney@...nel.org>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, "Graf Yang" <graf.yang@...log.com>
Subject: Re: [PATCH 2/5] Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code

On Wed, Nov 19, 2008 at 3:05 PM, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> On Wednesday 19 November 2008 17:56, Andrew Morton wrote:
>> On Tue, 18 Nov 2008 17:05:05 +0800 Bryan Wu <cooloney@...nel.org> wrote:
>
>> > +#define smp_mb__before_clear_bit() barrier()
>> > +#define smp_mb__after_clear_bit()  barrier()
>> > +
>> > +static inline void __set_bit(int nr, volatile unsigned long *addr)
>> > +{
>> > +   int *a = (int *)addr;
>> > +   int mask;
>> > +
>> > +   a += nr >> 5;
>> > +   mask = 1 << (nr & 0x1f);
>> > +   *a |= mask;
>> > +}
>> > +
>> > +static inline void __clear_bit(int nr, volatile unsigned long *addr)
>> > +{
>> > +   int *a = (int *)addr;
>> > +   int mask;
>> > +
>> > +   a += nr >> 5;
>> > +   mask = 1 << (nr & 0x1f);
>> > +   *a &= ~mask;
>> > +}
>> > +
>> > +static inline void __change_bit(int nr, volatile unsigned long *addr)
>> > +{
>> > +   int mask;
>> > +   unsigned long *ADDR = (unsigned long *)addr;
>> > +
>> > +   ADDR += nr >> 5;
>> > +   mask = 1 << (nr & 31);
>> > +   *ADDR ^= mask;
>> > +}
>>
>> I'm surprised there isn't any generic code which can be used for the above.
>
> include/asm-generic/bitops/non-atomic.h
>
>
>> > ...
>>
>> Gad what a lot of code.  I don't think I have time to read it all, sorry.
>
> :) I don't know who is expected to. Cc'ing linux-arch for something
> like this might attract some helpful comments.

Yeah, I posted it to linux-arch.
Thanks
-Bryan
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