linux-kernel - Re: [PATCH] x86: do_signal: simplify the TS_RESTORE

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Message-ID: <20110713102520.0065c7de@mfleming-mobl1.ger.corp.intel.com>
Date:	Wed, 13 Jul 2011 10:25:20 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: do_signal: simplify the TS_RESTORE_SIGMASK logic

On Sun, 10 Jul 2011 20:22:03 +0200
Oleg Nesterov <oleg@...hat.com> wrote:

> 1. do_signal() looks at TS_RESTORE_SIGMASK and calculates the
>    mask which should be stored in the signal frame, then it
>    passes "oldset" to the callees, down to setup_rt_frame().
> 
>    This is ugly, setup_rt_frame() can do this itself and nobody
>    else needs this sigset_t. Move this code into setup_rt_frame.
> 
> 2. do_signal() also clears TS_RESTORE_SIGMASK if handle_signal()
>    succeeds.
> 
>    We can move this to setup_rt_frame() as well, this avoids the
>    unnecessary checks and makes the logic more clear.
> 
> 3. use set_current_blocked() instead of sigprocmask(SIG_SETMASK),
>    sigprocmask() should be avoided.

Could you please mention commit e6fa16ab "signal: sigprocmask() should
do retarget_shared_pending()", since it's not immediately obvious in
this changelog why sigprocmask() should be avoided.

> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

FWIW,

Reviewed-by: Matt Fleming <matt.fleming@...ux.intel.com>

-- 
Matt Fleming, Intel Open Source Technology Center
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