Patch "s390/process: fix sfpc inline assembly" has been added to the 4.1-stable tree

Patch "s390/process: fix sfpc inline assembly" has been added to the 4.1-stable tree

[gregkh]

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

    s390/process: fix sfpc inline assembly

to the 4.1-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:
     s390-process-fix-sfpc-inline-assembly.patch
and it can be found in the queue-4.1 subdirectory.

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


>From e47994dd44bcb4a77b4152bd0eada585934703c0 Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 6 Jul 2015 15:02:37 +0200
Subject: s390/process: fix sfpc inline assembly

From: Heiko Carstens <heiko.carstens@de.ibm.com>

commit e47994dd44bcb4a77b4152bd0eada585934703c0 upstream.

The sfpc inline assembly within execve_tail() may incorrectly set bits
28-31 of the sfpc instruction to a value which is not zero.
These bits however are currently unused and therefore should be zero
so we won't get surprised if these bits will be used in the future.

Therefore remove the second operand from the inline assembly.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/s390/kernel/process.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -163,7 +163,7 @@ int copy_thread(unsigned long clone_flag
 asmlinkage void execve_tail(void)
 {
 	current->thread.fp_regs.fpc = 0;
-	asm volatile("sfpc %0,%0" : : "d" (0));
+	asm volatile("sfpc %0" : : "d" (0));
 }
 
 /*


Patches currently in stable-queue which might be from heiko.carstens@de.ibm.com are

queue-4.1/s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch
queue-4.1/s390-process-fix-sfpc-inline-assembly.patch
queue-4.1/s390-nmi-fix-vector-register-corruption.patch