From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965438AbcHNLv2 (ORCPT ); Sun, 14 Aug 2016 07:51:28 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:52368 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932846AbcHNLbO (ORCPT ); Sun, 14 Aug 2016 07:31:14 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Linux/MIPS" , "David Daney" , "Joshua Kinard" , "Ralf Baechle" Date: Sat, 13 Aug 2016 18:42:51 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 055/305] MIPS: Adjust set_pte() SMP fix to handle R10000_LLSC_WAR In-Reply-To: X-SA-Exim-Connect-IP: 92.40.249.202 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.37-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Joshua Kinard commit 128639395b2ceacc6a56a0141d0261012bfe04d3 upstream. Update the recent changes to set_pte() that were added in 46011e6ea392 to handle R10000_LLSC_WAR, and format the assembly to match other areas of the MIPS tree using the same WAR. This also incorporates a patch recently sent in my Markos Chandras, "Remove local LL/SC preprocessor variants", so that patch doesn't need to be applied if this one is accepted. Signed-off-by: Joshua Kinard Fixes: 46011e6ea392 ("MIPS: Make set_pte() SMP safe.) Cc: David Daney Cc: Linux/MIPS Patchwork: https://patchwork.linux-mips.org/patch/11103/ Signed-off-by: Ralf Baechle [bwh: Backported to 3.2: - Use {LL,SC}_INSN not __{LL,SC} - Use literal arch=r4000 instead of MIPS_ISA_ARCH_LEVEL since R6 is not supported] Signed-off-by: Ben Hutchings --- arch/mips/include/asm/pgtable.h | 45 +++++++++++++++++++++++++++++------------ 1 file changed, 32 insertions(+), 13 deletions(-) --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -167,20 +167,39 @@ static inline void set_pte(pte_t *ptep, unsigned long page_global = _PAGE_GLOBAL; unsigned long tmp; - __asm__ __volatile__ ( - " .set push\n" - " .set noreorder\n" - "1: " LL_INSN " %[tmp], %[buddy]\n" - " bnez %[tmp], 2f\n" - " or %[tmp], %[tmp], %[global]\n" - " " SC_INSN " %[tmp], %[buddy]\n" - " beqz %[tmp], 1b\n" - " nop\n" - "2:\n" - " .set pop" - : [buddy] "+m" (buddy->pte), - [tmp] "=&r" (tmp) + if (kernel_uses_llsc && R10000_LLSC_WAR) { + __asm__ __volatile__ ( + " .set arch=r4000 \n" + " .set push \n" + " .set noreorder \n" + "1:" LL_INSN " %[tmp], %[buddy] \n" + " bnez %[tmp], 2f \n" + " or %[tmp], %[tmp], %[global] \n" + SC_INSN " %[tmp], %[buddy] \n" + " beqzl %[tmp], 1b \n" + " nop \n" + "2: \n" + " .set pop \n" + " .set mips0 \n" + : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) : [global] "r" (page_global)); + } else if (kernel_uses_llsc) { + __asm__ __volatile__ ( + " .set arch=r4000 \n" + " .set push \n" + " .set noreorder \n" + "1:" LL_INSN " %[tmp], %[buddy] \n" + " bnez %[tmp], 2f \n" + " or %[tmp], %[tmp], %[global] \n" + SC_INSN " %[tmp], %[buddy] \n" + " beqz %[tmp], 1b \n" + " nop \n" + "2: \n" + " .set pop \n" + " .set mips0 \n" + : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) + : [global] "r" (page_global)); + } #else /* !CONFIG_SMP */ if (pte_none(*buddy)) pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;