Date: Sun, 10 Nov 2002 13:58:25 -0500 From: Jake Burkholder <jake@locore.ca> To: Matt Jacob <mjacob@FreeBSD.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/vm uma_dbg.c Message-ID: <20021110135825.B85338@locore.ca> In-Reply-To: <20021110135614.A85338@locore.ca>; from jake@locore.ca on Sun, Nov 10, 2002 at 01:56:14PM -0500 References: <200211101616.gAAGGiuV009632@repoman.freebsd.org> <20021110135614.A85338@locore.ca>
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Apparently, On Sun, Nov 10, 2002 at 01:56:14PM -0500,
Jake Burkholder said words to the effect of;
> Apparently, On Sun, Nov 10, 2002 at 08:16:44AM -0800,
> Matt Jacob said words to the effect of;
>
> > mjacob 2002/11/10 08:16:44 PST
> >
> > Modified files:
> > sys/vm uma_dbg.c
> > Log:
> > Use atomic_set_8 on the us_freelist maps as they are not otherwise
> > protected. Furthermore, in some RISC architectures with no normal
> > byte operations, the surrounding 3 bytes are also affected by the
> > read-modify-write that has to occur.
> >
> > Revision Changes Path
> > 1.9 +2 -2 src/sys/vm/uma_dbg.c
>
> sparc64 can't do atomic operations on less than 32 bits, this needs
> a lock.
>
fwiw this is in the man page:
Certain architectures also provide operations for types smaller than
``int''.
char unsigned character
short unsigned short integer
8 unsigned 8-bit integer
16 unsigned 16-bit integer
These must not be used in MI code because the instructions to implement
them efficiently may not be available.
Jake
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