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From: Tejun Heo <htejun@gmail.com>
To: Brian Gerst <brgerst@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] x86: Pass in pt_regs pointer for syscalls that need it
Date: Thu, 12 Feb 2009 00:14:42 +0900	[thread overview]
Message-ID: <4992EB62.3000501@gmail.com> (raw)
In-Reply-To: <73c1f2160902110710u77a563bftf09c460fab6f9136@mail.gmail.com>

Brian Gerst wrote:
> x86-64 doesn't have the tail-call problem because it doesn't use the
> pt_regs on stack trick for syscall args.  All the args are passed in
> registers.

Yeah, I was saying that we can do about the same thing on x86_32 by
passing in pointer to pt_regs and defining proper syscall wrappers.
It will cost a bit of performance by increasing register pressure tho.

-- 
tejun

  reply	other threads:[~2009-02-11 15:15 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-10 14:51 [PATCH 0/3] x86: Fix pt_regs passed by value Brian Gerst
2009-02-10 14:51 ` [PATCH 1/3] x86: Use pt_regs pointer in do_device_not_available() Brian Gerst
2009-02-11  7:43   ` Tejun Heo
2009-02-11 10:13     ` Ingo Molnar
2009-02-11 14:34     ` Brian Gerst
2009-02-11 14:42       ` Tejun Heo
2009-02-11 14:46         ` Brian Gerst
2009-02-11 14:53           ` Tejun Heo
2009-02-10 14:51 ` [PATCH 2/3] x86: Pass in pt_regs pointer for syscalls that need it Brian Gerst
2009-02-11  7:41   ` Tejun Heo
2009-02-11 10:18     ` Ingo Molnar
2009-02-11 14:14       ` Tejun Heo
2009-02-11 14:31     ` Brian Gerst
2009-02-11 14:41       ` Tejun Heo
2009-02-11 14:43         ` Tejun Heo
2009-02-11 14:48         ` Tejun Heo
2009-02-11 14:58           ` Ingo Molnar
2009-02-11 14:59           ` Brian Gerst
2009-02-11 15:05             ` Tejun Heo
2009-02-11 15:10               ` Brian Gerst
2009-02-11 15:14                 ` Tejun Heo [this message]
2009-02-11 15:59                   ` Ingo Molnar
2009-02-12  1:12                     ` Tejun Heo
2009-02-11 15:01       ` Ingo Molnar
2009-02-11 17:52   ` H. Peter Anvin
2009-02-11 18:27     ` Brian Gerst
2009-02-11 19:50       ` H. Peter Anvin
2009-02-11 19:57         ` Brian Gerst
2009-02-11 20:00           ` H. Peter Anvin
2009-02-11 21:43   ` [PATCH] x86: pass in pt_regs pointer for syscalls that need it (take 2) Brian Gerst
2009-02-11 21:50     ` H. Peter Anvin
2009-02-11 22:06     ` H. Peter Anvin
2009-02-12 11:02       ` Ingo Molnar
2009-02-10 14:51 ` [PATCH 3/3] x86: Drop -fno-stack-protector after pt_regs fixes Brian Gerst
2009-02-11 11:42 ` [PATCH 0/3] x86: Fix pt_regs passed by value Ingo Molnar
2009-02-11 14:15   ` Tejun Heo

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