This is a note to let you know that I've just added the patch titled
Revert "x86, amd: Disable way access filter on Piledriver CPUs" it is duplicated
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-x86-amd-disable-way-access-filter-on-piledriver-cpus-it-is-duplicated.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5e3fe67e02c53e5a5fcf0e2b0d91dd93f757d50b Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@xxxxxxx>
Date: Wed, 31 Oct 2012 17:20:50 +0100
Subject: Revert "x86, amd: Disable way access filter on Piledriver CPUs" it is duplicated
Revert 5e3fe67e02c53e5a5fcf0e2b0d91dd93f757d50b which is
commit 2bbf0a1427c377350f001fbc6260995334739ad7 upstream.
Willy pointed out that I messed up and applied this one twice to the
3.0-stable tree, so revert the second instance of it.
Reported by: Willy Tarreau <w@xxxxxx>
Cc: Andre Przywara <osp@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Cc: CAI Qian <caiqian@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
reverted:
---
arch/x86/kernel/cpu/amd.c | 14 --------------
1 file changed, 14 deletions(-)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -568,20 +568,6 @@ static void __cpuinit init_amd(struct cp
}
}
- /*
- * The way access filter has a performance penalty on some workloads.
- * Disable it on the affected CPUs.
- */
- if ((c->x86 == 0x15) &&
- (c->x86_model >= 0x02) && (c->x86_model < 0x20)) {
- u64 val;
-
- if (!rdmsrl_safe(0xc0011021, &val) && !(val & 0x1E)) {
- val |= 0x1E;
- checking_wrmsrl(0xc0011021, val);
- }
- }
-
cpu_detect_cache_sizes(c);
/* Multi core CPU? */
Patches currently in stable-queue which might be from andre.przywara@xxxxxxx are
queue-3.0/revert-x86-amd-disable-way-access-filter-on-piledriver-cpus-it-is-duplicated.patch
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