From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id 0C9B26B0282 for ; Sun, 4 Feb 2018 20:29:27 -0500 (EST) Received: by mail-pg0-f72.google.com with SMTP id 202so2570101pgb.13 for ; Sun, 04 Feb 2018 17:29:27 -0800 (PST) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id f64si6058069pfa.364.2018.02.04.17.28.03 for (version=TLS1 cipher=AES128-SHA bits=128/128); Sun, 04 Feb 2018 17:28:04 -0800 (PST) From: Davidlohr Bueso Subject: [PATCH 10/64] kernel/exit: teach exit_mm() about range locking Date: Mon, 5 Feb 2018 02:27:00 +0100 Message-Id: <20180205012754.23615-11-dbueso@wotan.suse.de> In-Reply-To: <20180205012754.23615-1-dbueso@wotan.suse.de> References: <20180205012754.23615-1-dbueso@wotan.suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, mingo@kernel.org Cc: peterz@infradead.org, ldufour@linux.vnet.ibm.com, jack@suse.cz, mhocko@kernel.org, kirill.shutemov@linux.intel.com, mawilcox@microsoft.com, mgorman@techsingularity.net, dave@stgolabs.net, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Davidlohr Bueso From: Davidlohr Bueso ... and use mm locking wrappers -- no change is semantics. Signed-off-by: Davidlohr Bueso --- kernel/exit.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/kernel/exit.c b/kernel/exit.c index 42ca71a44c9a..a9540f157eb2 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -495,6 +495,7 @@ static void exit_mm(void) { struct mm_struct *mm = current->mm; struct core_state *core_state; + DEFINE_RANGE_LOCK_FULL(mmrange); mm_release(current, mm); if (!mm) @@ -507,12 +508,12 @@ static void exit_mm(void) * will increment ->nr_threads for each thread in the * group with ->mm != NULL. */ - down_read(&mm->mmap_sem); + mm_read_lock(mm, &mmrange); core_state = mm->core_state; if (core_state) { struct core_thread self; - up_read(&mm->mmap_sem); + mm_read_unlock(mm, &mmrange); self.task = current; self.next = xchg(&core_state->dumper.next, &self); @@ -530,14 +531,14 @@ static void exit_mm(void) freezable_schedule(); } __set_current_state(TASK_RUNNING); - down_read(&mm->mmap_sem); + mm_read_lock(mm, &mmrange); } mmgrab(mm); BUG_ON(mm != current->active_mm); /* more a memory barrier than a real lock */ task_lock(current); current->mm = NULL; - up_read(&mm->mmap_sem); + mm_read_unlock(mm, &mmrange); enter_lazy_tlb(mm, current); task_unlock(current); mm_update_next_owner(mm); -- 2.13.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org