linux-kernel - Re: add IRQS_PENDING for nested, simple and level handler to early abort suspend operation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.LFD.2.02.1205180950400.3231@ionos>
Date:	Fri, 18 May 2012 09:55:13 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ning Jiang <ning.n.jiang@...il.com>
cc:	rjw@...k.pl, linux-kernel@...r.kernel.org
Subject: Re: add IRQS_PENDING for nested, simple and level handler to early
 abort suspend operation

On Fri, 18 May 2012, Ning Jiang wrote:

> During suspend check_wakeup_irqs() will check IRQS_PENDING flag to
> abort a suspend operation, however, this only applies for edge
> triggered irq. Add IRQS_PENDING for nested, simple and level handler
> to mimic the same behaviour as edge irq handler.
> 
> Without this optimization, level irq can be handled correctly but there
> is some penalty. It has to go through a full run/suspend power cycle for level
> irq to be detected and handled. With it, we can abort the suspend operation
> earlier and thus shorten the interrupt latency.
> 
> I know this is ugly as IRQS_PENDING is intended for edge irq but I don't
> know how to do it in a right way. Please enlighten me if you have better ideas.

First of all, please send patches inlined. Aside of that a similar
patch is queued in tip/irq/core commit d4dc0f90.

Thanks,

	tglx


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/