From: Jun Sun <jsun@mvista.com>
To: linux-mips@oss.sgi.com
Subject: MIPS_ATOMIC_SET in sys_sysmips()
Date: Mon, 18 Dec 2000 18:03:43 -0800 [thread overview]
Message-ID: <3A3EC1FF.9B86E2AC@mvista.com> (raw)
It looks like sometime after test5 the MIPS_ATOMIC_SET case in sys_sysmips()
function in the CVS tree is changed. The new code now uses ll/sc instructions
and handles syscall trace, etc..
This change does not make sense to me. The userland typically uses
MIPS_ATOMIC_SET when ll/sc instructions are not available. But the new code
itself uses ll/sc, which pretty much forfeit the purpose. Or do I miss
something else?
What do we offer to machines without ll/sc?
BTW, what is the wrong with previous code? I understand it may be broken in
SMP case, but I think that is fixable. Comments?
Jun
next reply other threads:[~2000-12-19 2:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-19 2:03 Jun Sun [this message]
2000-12-19 13:25 ` MIPS_ATOMIC_SET in sys_sysmips() Maciej W. Rozycki
2000-12-19 17:03 ` Harald Koerfgen
2000-12-19 18:03 ` Maciej W. Rozycki
2000-12-19 18:38 ` Jun Sun
2000-12-20 13:24 ` Maciej W. Rozycki
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