Patch "ARM: VFP: fix emulation of second VFP instruction" has been added to the 3.8-stable tree

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This is a note to let you know that I've just added the patch titled

    ARM: VFP: fix emulation of second VFP instruction

to the 3.8-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:
     arm-vfp-fix-emulation-of-second-vfp-instruction.patch
and it can be found in the queue-3.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 5e4ba617c1b584b2e376f31a63bd4e734109318a Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Date: Mon, 25 Feb 2013 16:09:12 +0000
Subject: ARM: VFP: fix emulation of second VFP instruction

From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

commit 5e4ba617c1b584b2e376f31a63bd4e734109318a upstream.

Martin Storsjö reports that the sequence:

        ee312ac1        vsub.f32        s4, s3, s2
        ee702ac0        vsub.f32        s5, s1, s0
        e59f0028        ldr             r0, [pc, #40]
        ee111a90        vmov            r1, s3

on Raspberry Pi (implementor 41 architecture 1 part 20 variant b rev 5)
where s3 is a denormal and s2 is zero results in incorrect behaviour -
the instruction "vsub.f32 s5, s1, s0" is not executed:

        VFP: bounce: trigger ee111a90 fpexc d0000780
        VFP: emulate: INST=0xee312ac1 SCR=0x00000000
        ...

As we can see, the instruction triggering the exception is the "vmov"
instruction, and we emulate the "vsub.f32 s4, s3, s2" but fail to
properly take account of the FPEXC_FP2V flag in FPEXC.  This is because
the test for the second instruction register being valid is bogus, and
will always skip emulation of the second instruction.

Reported-by: Martin Storsjö <martin@xxxxxxxxx>
Tested-by: Martin Storsjö <martin@xxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/arm/vfp/vfpmodule.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -413,7 +413,7 @@ void VFP_bounce(u32 trigger, u32 fpexc,
 	 * If there isn't a second FP instruction, exit now. Note that
 	 * the FPEXC.FP2V bit is valid only if FPEXC.EX is 1.
 	 */
-	if (fpexc ^ (FPEXC_EX | FPEXC_FP2V))
+	if ((fpexc & (FPEXC_EX | FPEXC_FP2V)) != (FPEXC_EX | FPEXC_FP2V))
 		goto exit;
 
 	/*


Patches currently in stable-queue which might be from rmk+kernel@xxxxxxxxxxxxxxxx are

queue-3.8/arm-7654-1-preserve-l_pte_valid-in-pte_modify.patch
queue-3.8/arm-7653-2-do-not-scale-loops_per_jiffy-when-using-a-constant-delay-clock.patch
queue-3.8/arm-vfp-fix-emulation-of-second-vfp-instruction.patch
queue-3.8/arm-fix-scheduling-while-atomic-warning-in-alignment-handling-code.patch
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