This is a note to let you know that I've just added the patch titled
MIPS: Remove BUG_ON(!is_fpu_owner()) in do_ade()
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-remove-bug_on-is_fpu_owner-in-do_ade.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 2e5767a27337812f6850b3fa362419e2f085e5c3 Mon Sep 17 00:00:00 2001
From: Huacai Chen <chenhc@xxxxxxxxxx>
Date: Wed, 16 Jul 2014 09:19:16 +0800
Subject: MIPS: Remove BUG_ON(!is_fpu_owner()) in do_ade()
From: Huacai Chen <chenhc@xxxxxxxxxx>
commit 2e5767a27337812f6850b3fa362419e2f085e5c3 upstream.
In do_ade(), is_fpu_owner() isn't preempt-safe. For example, when an
unaligned ldc1 is executed, do_cpu() is called and then FPU will be
enabled (and TIF_USEDFPU will be set for the current process). Then,
do_ade() is called because the access is unaligned. If the current
process is preempted at this time, TIF_USEDFPU will be cleard. So when
the process is scheduled again, BUG_ON(!is_fpu_owner()) is triggered.
This small program can trigger this BUG in a preemptible kernel:
int main (int argc, char *argv[])
{
double u64[2];
while (1) {
asm volatile (
".set push \n\t"
".set noreorder \n\t"
"ldc1 $f3, 4(%0) \n\t"
".set pop \n\t"
::"r"(u64):
);
}
return 0;
}
V2: Remove the BUG_ON() unconditionally due to Paul's suggestion.
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Signed-off-by: Jie Chen <chenj@xxxxxxxxxx>
Signed-off-by: Rui Wang <wangr@xxxxxxxxxx>
Cc: John Crispin <john@xxxxxxxxxxx>
Cc: Steven J. Hill <Steven.Hill@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: Fuxin Zhang <zhangfx@xxxxxxxxxx>
Cc: Zhangjin Wu <wuzhangjin@xxxxxxxxx>
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/unaligned.c | 1 -
1 file changed, 1 deletion(-)
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -605,7 +605,6 @@ static void emulate_load_store_insn(stru
case sdc1_op:
die_if_kernel("Unaligned FP access in kernel code", regs);
BUG_ON(!used_math());
- BUG_ON(!is_fpu_owner());
lose_fpu(1); /* Save FPU state for the emulator. */
res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1,
Patches currently in stable-queue which might be from chenhc@xxxxxxxxxx are
queue-3.14/mips-remove-bug_on-is_fpu_owner-in-do_ade.patch
queue-3.14/mips-tlbex-fix-a-missing-statement-for-hugetlb.patch
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