linux-kernel - Re: [PATCH 2/3] x86: Pass in pt_regs pointer for syscalls that need it

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Message-ID: <4992EB62.3000501@gmail.com>
Date:	Thu, 12 Feb 2009 00:14:42 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Brian Gerst <brgerst@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] x86: Pass in pt_regs pointer for syscalls that need
 	it

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
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