From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:43490 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946254AbbHGUoT (ORCPT ); Fri, 7 Aug 2015 16:44:19 -0400 Subject: Patch "s390/sclp: clear upper register halves in _sclp_print_early" has been added to the 3.10-stable tree To: schwidefsky@de.ibm.com, gregkh@linuxfoundation.org Cc: , From: Date: Fri, 07 Aug 2015 13:44:05 -0700 Message-ID: <143898024514578@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled s390/sclp: clear upper register halves in _sclp_print_early to the 3.10-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-sclp-clear-upper-register-halves-in-_sclp_print_early.patch and it can be found in the queue-3.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From f9c87a6f46d508eae0d9ae640be98d50f237f827 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 6 Jul 2015 17:58:19 +0200 Subject: s390/sclp: clear upper register halves in _sclp_print_early From: Martin Schwidefsky commit f9c87a6f46d508eae0d9ae640be98d50f237f827 upstream. If the kernel is compiled with gcc 5.1 and the XZ compression option the decompress_kernel function calls _sclp_print_early in 64-bit mode while the content of the upper register half of %r6 is non-zero. This causes a specification exception on the servc instruction in _sclp_servc. The _sclp_print_early function saves and restores the upper registers halves but it fails to clear them for the 31-bit code of the mini sclp driver. Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/sclp.S | 4 ++++ 1 file changed, 4 insertions(+) --- a/arch/s390/kernel/sclp.S +++ b/arch/s390/kernel/sclp.S @@ -276,6 +276,8 @@ ENTRY(_sclp_print_early) jno .Lesa2 ahi %r15,-80 stmh %r6,%r15,96(%r15) # store upper register halves + basr %r13,0 + lmh %r0,%r15,.Lzeroes-.(%r13) # clear upper register halves .Lesa2: #endif lr %r10,%r2 # save string pointer @@ -299,6 +301,8 @@ ENTRY(_sclp_print_early) #endif lm %r6,%r15,120(%r15) # restore registers br %r14 +.Lzeroes: + .fill 64,4,0 .LwritedataS4: .long 0x00760005 # SCLP command for write data Patches currently in stable-queue which might be from schwidefsky@de.ibm.com are queue-3.10/s390-sclp-clear-upper-register-halves-in-_sclp_print_early.patch