From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755226AbbESHUN (ORCPT ); Tue, 19 May 2015 03:20:13 -0400 Received: from terminus.zytor.com ([198.137.202.10]:60357 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754044AbbESHUI (ORCPT ); Tue, 19 May 2015 03:20:08 -0400 Date: Tue, 19 May 2015 00:19:30 -0700 From: tip-bot for David Hildenbrand Message-ID: Cc: torvalds@linux-foundation.org, dahi@linux.vnet.ibm.com, tglx@linutronix.de, peterz@infradead.org, mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org Reply-To: peterz@infradead.org, dahi@linux.vnet.ibm.com, tglx@linutronix.de, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org In-Reply-To: <1431359540-32227-6-git-send-email-dahi@linux.vnet.ibm.com> References: <1431359540-32227-6-git-send-email-dahi@linux.vnet.ibm.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/preempt, mm/kmap, MIPS: Disable preemption in kmap_coherent() explicitly Git-Commit-ID: ce01948eb85da733558fa77c2a554144a57ab0fb X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: ce01948eb85da733558fa77c2a554144a57ab0fb Gitweb: http://git.kernel.org/tip/ce01948eb85da733558fa77c2a554144a57ab0fb Author: David Hildenbrand AuthorDate: Mon, 11 May 2015 17:52:10 +0200 Committer: Ingo Molnar CommitDate: Tue, 19 May 2015 08:39:15 +0200 sched/preempt, mm/kmap, MIPS: Disable preemption in kmap_coherent() explicitly k(un)map_coherent relies on pagefault_disable() to also disable preemption. Let's make this explicit, to prepare for pagefault_disable() not touching preemption anymore. This patch is based on a patch by Yang Shi on the -rt tree: "k{un}map_coherent are just called when cpu_has_dc_aliases == 1 with VIPT cache. However, actually, the most modern MIPS processors have PIPT dcache without dcache alias issue. In such case, k{un}map_atomic will be called with preempt enabled." Reviewed-and-tested-by: Thomas Gleixner Signed-off-by: David Hildenbrand Signed-off-by: Peter Zijlstra (Intel) Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-6-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar --- arch/mips/mm/init.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index faa5c98..198a314 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -90,6 +90,7 @@ static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot) BUG_ON(Page_dcache_dirty(page)); + preempt_disable(); pagefault_disable(); idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); idx += in_interrupt() ? FIX_N_COLOURS : 0; @@ -152,6 +153,7 @@ void kunmap_coherent(void) write_c0_entryhi(old_ctx); local_irq_restore(flags); pagefault_enable(); + preempt_enable(); } void copy_user_highpage(struct page *to, struct page *from,