linux-kernel - Re: [linux-pm] [RFC PATCH v2 4/4] cpuidle: (POWER) Handle power

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <1322628761.21641.40.camel@pasglop>
Date:	Wed, 30 Nov 2011 15:52:41 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...abs.org, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [linux-pm] [RFC PATCH v2 4/4] cpuidle: (POWER) Handle
 power_save=off

On Wed, 2011-11-30 at 06:55 +0530, Deepthi Dharwar wrote:
> I was trying to add a return value for power_save for all arch/powepc
> idle functions but a few of them directly call *.S  routines, as they
> are asm.
> 
> What would be a good way to change the return value  for asm
> routines ?
> Do we make a change in asm only, put the return value in r3 or write a
> wrapper function which would call these asm routines and return an
> int ?

No, add li r3,0 at the end, but beware that their return point might not
be ovbvious since we often return from an interrupt which modifies the
return address ... Let me know if there's some you can't figure out and
I'll help you.

Cheers,
Ben.


--
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/