From: Arjan van de Ven <arjan@infradead.org>
To: Luming Yu <luming.yu@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Len Brown <lenb@kernel.org>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
"Siddha, Suresh B" <suresh.b.siddha@intel.com>
Subject: Re: [RFC PATCH] C2 could be mapped to C3 so need a flush cache
Date: Mon, 7 Sep 2009 20:49:13 -0700 [thread overview]
Message-ID: <20090907204913.2aef5c49@infradead.org> (raw)
In-Reply-To: <3877989d0909071926q77aac67cj532137513710025d@mail.gmail.com>
On Tue, 8 Sep 2009 10:26:06 +0800
Luming Yu <luming.yu@gmail.com> wrote:
> Hi there,
>
> I came across acpi_idle_enter_simple, noticed it looks like a bug if
> we don't flush cache for C2.
> Because some platforms just map C2 to C3.
I think you are confusing ACPI C3 with HW C3.
Only for ACPI C3 class do you need to flush the cache for this case.
For HW C3, if you would need to flush the cache, the BIOS would assign
it ACPI C3 class.
next prev parent reply other threads:[~2009-09-08 3:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-08 2:26 [RFC PATCH] C2 could be mapped to C3 so need a flush cache Luming Yu
2009-09-08 3:49 ` Arjan van de Ven [this message]
2009-09-08 5:09 ` Luming Yu
2009-09-08 7:52 ` Arjan van de Ven
2009-09-08 8:20 ` Luming Yu
2009-09-08 8:32 ` Arjan van de Ven
2009-09-08 15:38 ` Len Brown
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