From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Stephen Boyd <sboyd@codeaurora.org>
Cc: Brian Swetland <swetland@google.com>,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: avoid mis-detecting some V7 cores in the decompressor
Date: Fri, 24 May 2013 00:15:31 +0100 [thread overview]
Message-ID: <20130523231531.GT18614@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <519E57D2.3050000@codeaurora.org>
On Thu, May 23, 2013 at 10:54:26AM -0700, Stephen Boyd wrote:
> On 05/15/13 12:38, Stephen Boyd wrote:
> > On 05/08/13 14:47, Stephen Boyd wrote:
> >> From: Brian Swetland <swetland@google.com>
> >>
> >> Currently v7 CPUs with an MIDR that has no bits set in the range
> >> [16:12] will be detected as old ARM CPUs with no caches and so
> >> the cache will never be turned on during decompression. ARM's
> >> Cortex chips have an 0xC in the range [16:12] so they never match
> >> this entry, but Qualcomm's Scorpion and Krait processors never
> >> set these bits to anything besides 0 so they always match.
> >>
> >> Skip this entry if we've compiled in support for v7 CPUs. This
> >> allows kernel decompression to happen nearly instantly instead of
> >> taking over 20 seconds.
> >>
> >> Signed-off-by: Brian Swetland <swetland@google.com>
> >> [sboyd: Clarified and extended commit text]
> >> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
> >> ---
> > Ping?
>
> Russell, shall I add this to the patch tracker?
Yes please.
next prev parent reply other threads:[~2013-05-23 23:15 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-08 21:47 Stephen Boyd
2013-05-08 21:50 ` Stephen Boyd
2013-05-15 19:38 ` Stephen Boyd
2013-05-23 17:54 ` Stephen Boyd
2013-05-23 23:15 ` Russell King - ARM Linux [this message]
2013-05-24 22:05 ` Stephen Boyd
2013-06-03 21:13 ` Stephen Boyd
2013-06-03 21:33 ` Nicolas Pitre
2013-06-03 22:38 ` Russell King - ARM Linux
2013-06-03 22:23 ` Russell King - ARM Linux
2013-06-03 22:37 ` Stephen Boyd
2013-06-03 22:45 ` Russell King - ARM Linux
2013-06-03 22:59 ` Stephen Boyd
2013-06-04 5:27 ` Nicolas Pitre
2013-06-04 19:47 ` Stephen Boyd
2013-06-04 21:13 ` Nicolas Pitre
2013-06-04 21:45 ` Stephen Boyd
2013-06-05 2:23 ` Nicolas Pitre
2013-06-06 1:29 ` Stephen Boyd
2013-06-06 4:21 ` Nicolas Pitre
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