Patchwork [3.5.y.z,extended,stable] Patch "ARM: 7696/1: Fix kexec by setting outer_cache.inv_all for" has been added to staging queue

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Submitter Luis Henriques
Date April 22, 2013, 12:38 p.m.
Message ID <1366634310-16805-1-git-send-email-luis.henriques@canonical.com>
Download mbox | patch
Permalink /patch/238509/
State New
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Comments

Luis Henriques - April 22, 2013, 12:38 p.m.
This is a note to let you know that I have just added a patch titled

    ARM: 7696/1: Fix kexec by setting outer_cache.inv_all for

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

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From 0436e56ca789915298b1c212b886c6479775a20e Mon Sep 17 00:00:00 2001
From: Illia Ragozin <illia.ragozin@grapecom.com>
Date: Wed, 10 Apr 2013 19:43:34 +0100
Subject: [PATCH] ARM: 7696/1: Fix kexec by setting outer_cache.inv_all for
 Feroceon

commit cd272d1ea71583170e95dde02c76166c7f9017e6 upstream.

On Feroceon the L2 cache becomes non-coherent with the CPU
when the L1 caches are disabled. Thus the L2 needs to be invalidated
after both L1 caches are disabled.

On kexec before the starting the code for relocation the kernel,
the L1 caches are disabled in cpu_froc_fin (cpu_v7_proc_fin for Feroceon),
but after L2 cache is never invalidated, because inv_all is not set
in cache-feroceon-l2.c.
So kernel relocation and decompression may has (and usually has) errors.
Setting the function enables L2 invalidation and fixes the issue.

Signed-off-by: Illia Ragozin <illia.ragozin@grapecom.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 arch/arm/mm/cache-feroceon-l2.c | 1 +
 1 file changed, 1 insertion(+)

--
1.8.1.2

Patch

diff --git a/arch/arm/mm/cache-feroceon-l2.c b/arch/arm/mm/cache-feroceon-l2.c
index dd3d591..48bc3c0 100644
--- a/arch/arm/mm/cache-feroceon-l2.c
+++ b/arch/arm/mm/cache-feroceon-l2.c
@@ -343,6 +343,7 @@  void __init feroceon_l2_init(int __l2_wt_override)
 	outer_cache.inv_range = feroceon_l2_inv_range;
 	outer_cache.clean_range = feroceon_l2_clean_range;
 	outer_cache.flush_range = feroceon_l2_flush_range;
+	outer_cache.inv_all = l2_inv_all;

 	enable_l2();