From: Keith Owens <kaos@ocs.com.au>
To: Florian Lohoff <flo@rfc822.org>
Cc: linux-irda@PASTA.cs.uit.no, mzyngier@freesurf.fr,
linux-kernel@vger.kernel.org
Subject: Re: [Linux-IrDA]Re: [IrDA+SMP] Lockup in handle_IRQ_event
Date: Thu, 04 Jan 2001 23:06:35 +1100 [thread overview]
Message-ID: <6377.978609995@ocs3.ocs-net> (raw)
In-Reply-To: Your message of "Thu, 04 Jan 2001 11:51:59 BST." <20010104115159.D7660@paradigm.rfc822.org>
On Thu, 4 Jan 2001 11:51:59 +0100,
Florian Lohoff <flo@rfc822.org> wrote:
>and a lot of other places simply use "save_flags(flags); cli();
>restore_flags()". Can someone enlighten me how this is supposed to work
>on SMP machines ? AFAIK "cli()" only disables IRQs on the local
>CPU so a different CPU could easily stumple half way as this
>is definitly non atomic.
cli() is not the cli instruction anymore. On smp cli() maps to
__global_cli() which is responsible for disabling interrupts on the
other processors. See __global_cli in arch/*/kernel/irq.c.
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prev parent reply other threads:[~2001-01-04 12:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-03 22:20 Marc ZYNGIER
2001-01-03 23:18 ` Andrew Morton
2001-01-04 9:58 ` Marc ZYNGIER
2001-01-04 13:22 ` Andrew Morton
2001-01-04 14:13 ` [PATCH] " Marc ZYNGIER
2001-01-04 10:51 ` [Linux-IrDA]Re: " Florian Lohoff
2001-01-04 12:04 ` Anton Blanchard
2001-01-04 12:06 ` Keith Owens [this message]
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