From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: avoid Cortex-A9 livelock on tight dmb loops
Date: Tue, 10 Apr 2018 06:41:49 -0700 [thread overview]
Message-ID: <20180410134149.GQ5700@atomide.com> (raw)
In-Reply-To: <E1f5qij-00033R-Sl@rmk-PC.armlinux.org.uk>
* Russell King <rmk+kernel@armlinux.org.uk> [180410 10:43]:
> diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
> index 021b5a8b9c0a..d4ddc78b2a0b 100644
> --- a/arch/arm/mach-omap2/prm_common.c
> +++ b/arch/arm/mach-omap2/prm_common.c
> @@ -523,7 +523,7 @@ void omap_prm_reset_system(void)
> prm_ll_data->reset_system();
>
> while (1)
> - cpu_relax();
> + cpu_do_idle();
> }
>
Hmm we need to check so the added WFI here does not cause an
undesired change to a low power state. Adding Tero to Cc also.
Regards,
Tony
next prev parent reply other threads:[~2018-04-10 13:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-10 10:41 [PATCH] ARM: avoid Cortex-A9 livelock on tight dmb loops Russell King
2018-04-10 13:41 ` Tony Lindgren [this message]
2018-04-10 14:12 ` Tero Kristo
2018-04-10 15:28 ` Will Deacon
2018-04-11 12:52 ` Russell King - ARM Linux
2018-04-11 12:57 ` Tero Kristo
2018-04-11 12:59 ` Keerthy
2018-04-11 13:10 ` Russell King - ARM Linux
2018-04-11 14:11 ` Tony Lindgren
2018-04-15 14:08 ` Russell King - ARM Linux
2018-04-15 15:50 ` Russell King - ARM Linux
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180410134149.GQ5700@atomide.com \
--to=tony@atomide.com \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).