linux-kernel - Re: [PATCH,SPARC] make sparc32 arch_write

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Message-ID: <20110815152436.GA31355@merkur.ravnborg.org>
Date:	Mon, 15 Aug 2011 17:24:36 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	Josip Rodin <joy@...uzijast.net>, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH,SPARC] make sparc32 arch_write_unlock() match the
	sparc64 version

Hi Mikael.

>  > > @@ -175,7 +184,7 @@ static inline int __arch_read_trylock(ar
>  > >  	res; \
>  > >  })
>  > >  
>  > > -#define arch_write_unlock(rw)	do { (rw)->lock = 0; } while(0)
>  > > +#define arch_write_unlock(rw)	arch_write_unlock(rw)
>  > >  
>  > >  #define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
>  > >  #define arch_read_lock_flags(rw, flags)   arch_read_lock(rw)
>  > 
>  > Why keep the tautological define? Just wondering.
> 
> Only because sparc64 does it that way.  I now see that no other
> arch has the #define, so perhaps that bit should be deleted (from
> both sparc64 and sparc32).
Please kill the extra define in both sparc32 and sparc64.
Preferably in two separate patches.

For the subject of the patch please use:
[PATCH] sparc32: bla bla

Because when davem apply the patch everything in [] is zapped,
and it is good to see in the shortlog that this is a sparc32 specific patch.

For sparc64 we sometimes use "sparc64: bla bal", and sometimes use
"sparc: bla bla".
I prefer the first but no strong feelings.

And btw thanks for looking at this! Looks like a very difficult bug to nail.

	Sam
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