linux-kernel - Re: [patch 0/6] sys_indirect RFC

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Message-ID: <Pine.LNX.4.64.0707021733080.14774@alien.or.mcafeemobile.com>
Date:	Mon, 2 Jul 2007 17:37:17 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ulrich Drepper <drepper@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 0/6] sys_indirect RFC - sys_indirect introduction

On Mon, 2 Jul 2007, Ulrich Drepper wrote:

> > But there are
> > examples (and the signal stuff is one of them), where you do need the
> > set_context+syscall+unset_context abstraction, for all cases where the
> > kernel already has its own internal data strctures. In those cases you'd
> > have to spread sys_internal context knowledge all around the kernel,
> > whereas the current solution allows you to confine the code inside
> > kernel/indirect.c
> 
> Nonsense.  Whether you have a new word in the task structure or a
> pointer to a structure, you have to embed knowledge of this
> indirection in every affected code paths.  There is no difference
> here.  The only difference is that trying to force everything through
> an artificially complicated common entry code.
> 
> I hope that Andrew+Linus will see through this.  I'm done arguing.

I simply asked you to look how the code/patch would look like to handle 
the ppoll/pselect/epoll_pwait stuff, and precisely where your changes had 
to go. Or even in the exmaple Linus made of "make the fsuid/fsgid 
temporarily be my _real_ uid/gid for this single system call" for what it 
matters.



- Davide


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