linux-kernel - Re: [PATCH 2/4] set_restore_sigmask TIF

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Date:	Wed, 09 Apr 2008 17:14:13 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] set_restore_sigmask TIF_SIGPENDING

On Wed, 2008-04-09 at 15:39 +0400, Oleg Nesterov wrote:
> As I see it, the main disadvantage of ERESTART_ approach is that we need 2
> new ERESTART_ codes, one for ERESTARTNOHAND, another for ERESTART_RESTARTBLOCK.
> And yes, while I personally think this is "more clean", it is very subjective.

Subjective, yeah.... personally, I don't like using ERESTART_xxx much,
because you're _not_ necessarily restarting the system call. The
separate flag for TIF_RESTORE_SIGMASK (or TLF_RESTORE_SIGMASK) seems
cleaner to me -- especially once you observe that you need new codes for
ERESTART_xxx_AND_RESTORE_SIGMASK for each ERESTART_xxx that you might
want to use in conjunction with the flags.

But I don't really care much either, if you want to change it and get
the details right.

One of the supposed advantages of TIF_RESTORE_SIGMASK in the first
place, iirc, was that it allowed us to return a result code other than
-EINTR as _well_ as restoring the signal mask. But we don't actually
make use of that possibility now anyway.

-- 
dwmw2

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