This is a note to let you know that I've just added the patch titled
MIPS: Fix C0_Pagegrain[IEC] support.
to the 3.14-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:
mips-fix-c0_pagegrain-support.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9ead8632bbf454cfc709b6205dc9cd8582fb0d64 Mon Sep 17 00:00:00 2001
From: David Daney <david.daney@xxxxxxxxxx>
Date: Tue, 6 Jan 2015 10:42:23 -0800
Subject: MIPS: Fix C0_Pagegrain[IEC] support.
From: David Daney <david.daney@xxxxxxxxxx>
commit 9ead8632bbf454cfc709b6205dc9cd8582fb0d64 upstream.
The following commits:
5890f70f15c52d (MIPS: Use dedicated exception handler if CPU supports RI/XI exceptions)
6575b1d4173eae (MIPS: kernel: cpu-probe: Detect unique RI/XI exceptions)
break the kernel for *all* existing MIPS CPUs that implement the
CP0_PageGrain[IEC] bit. They cause the TLB exception handlers to be
generated without the legacy execute-inhibit handling, but never set
the CP0_PageGrain[IEC] bit to activate the use of dedicated exception
vectors for execute-inhibit exceptions. The result is that upon
detection of an execute-inhibit violation, we loop forever in the TLB
exception handlers instead of sending SIGSEGV to the task.
If we are generating TLB exception handlers expecting separate
vectors, we must also enable the CP0_PageGrain[IEC] feature.
The bug was introduced in kernel version 3.17.
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
Cc: Leonid Yegoshin <Leonid.Yegoshin@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: http://patchwork.linux-mips.org/patch/8880/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/mm/tlb-r4k.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -445,6 +445,8 @@ void tlb_init(void)
#ifdef CONFIG_64BIT
pg |= PG_ELPA;
#endif
+ if (cpu_has_rixiex)
+ pg |= PG_IEC;
write_c0_pagegrain(pg);
}
Patches currently in stable-queue which might be from david.daney@xxxxxxxxxx are
queue-3.14/mips-fix-c0_pagegrain-support.patch
queue-3.14/mips-fix-kernel-lockup-or-crash-after-cpu-offline-online.patch
queue-3.14/mips-octeon-fix-kernel-crash-when-offlining-a-cpu.patch
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