| To: | Franck Bui-Huu <vagabon.xyz@gmail.com> |
|---|---|
| Subject: | Re: [PATCH 1/3] signal: avoid useless test in do_signal() |
| From: | Ralf Baechle <ralf@linux-mips.org> |
| Date: | Fri, 9 Feb 2007 16:21:18 +0000 |
| Cc: | linux-mips@linux-mips.org, anemo@mba.ocn.ne.jp, Franck Bui-Huu <fbuihuu@gmail.com> |
| In-reply-to: | <11710336594091-git-send-email-fbuihuu@gmail.com> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <1171033658561-git-send-email-fbuihuu@gmail.com> <11710336594091-git-send-email-fbuihuu@gmail.com> |
| Sender: | linux-mips-bounce@linux-mips.org |
| User-agent: | Mutt/1.4.2.2i |
On Fri, Feb 09, 2007 at 04:07:36PM +0100, Franck Bui-Huu wrote: > - if (test_thread_flag(TIF_RESTORE_SIGMASK)) > - clear_thread_flag(TIF_RESTORE_SIGMASK); This is a microoptimization. The assumption here is TIF_RESTORE_SIGMASK will rarely need to be cleared and atomic operations are somewhat expensive if as in this case we have to assume the cacheline isn't held exclusive yet. Ralf |
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