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[35.238.199.243]) by smtp.gmail.com with ESMTPSA id y18sm1829721ili.18.2021.05.27.13.23.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 May 2021 13:23:02 -0700 (PDT) Date: Thu, 27 May 2021 20:23:01 +0000 From: Dennis Zhou To: Linus Torvalds Cc: Tejun Heo , Christoph Lameter , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [GIT PULL] percpu changes for v5.13-rc4 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Authentication-Results: imf22.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=kernel.org (policy=none); spf=pass (imf22.hostedemail.com: domain of dennisszhou@gmail.com designates 209.85.166.46 as permitted sender) smtp.mailfrom=dennisszhou@gmail.com X-Stat-Signature: 8n3uien7zej4hegwd3i4qmowrmuhyc8y X-Rspamd-Queue-Id: 8A422C007748 X-Rspamd-Server: rspam02 X-HE-Tag: 1622146975-110134 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Linus, This contains a cleanup to lib/percpu-refcount.c and an update to the MAINTAINERS file to more formally take over support for lib/percpu*. A few things I expect to have ready for-5.14, percpu depopulation (queued) and an updated to percpu memcg accounting (wip from Roman Gushchin). Thanks, Dennis The following changes since commit 6efb943b8616ec53a5e444193dccf1af9ad627b5: Linux 5.13-rc1 (2021-05-09 14:17:44 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git for-5.13-fixes for you to fetch changes up to c547addba7096debac4f99cdfe869a32a81081e2: MAINTAINERS: Add lib/percpu* as part of percpu entry (2021-05-13 04:50:30 +0000) ---------------------------------------------------------------- Nikolay Borisov (2): percpu_ref: Don't opencode percpu_ref_is_dying MAINTAINERS: Add lib/percpu* as part of percpu entry MAINTAINERS | 2 ++ lib/percpu-refcount.c | 6 +++--- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/MAINTAINERS b/MAINTAINERS index bd7aff0c120f..9599e313d7f7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14317,10 +14317,12 @@ PER-CPU MEMORY ALLOCATOR M: Dennis Zhou M: Tejun Heo M: Christoph Lameter +L: linux-mm@kvack.org S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git F: arch/*/include/asm/percpu.h F: include/linux/percpu*.h +F: lib/percpu*.c F: mm/percpu*.c PER-TASK DELAY ACCOUNTING diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c index a1071cdefb5a..af9302141bcf 100644 --- a/lib/percpu-refcount.c +++ b/lib/percpu-refcount.c @@ -275,7 +275,7 @@ static void __percpu_ref_switch_mode(struct percpu_ref *ref, wait_event_lock_irq(percpu_ref_switch_waitq, !data->confirm_switch, percpu_ref_switch_lock); - if (data->force_atomic || (ref->percpu_count_ptr & __PERCPU_REF_DEAD)) + if (data->force_atomic || percpu_ref_is_dying(ref)) __percpu_ref_switch_to_atomic(ref, confirm_switch); else __percpu_ref_switch_to_percpu(ref); @@ -385,7 +385,7 @@ void percpu_ref_kill_and_confirm(struct percpu_ref *ref, spin_lock_irqsave(&percpu_ref_switch_lock, flags); - WARN_ONCE(ref->percpu_count_ptr & __PERCPU_REF_DEAD, + WARN_ONCE(percpu_ref_is_dying(ref), "%s called more than once on %ps!", __func__, ref->data->release); @@ -465,7 +465,7 @@ void percpu_ref_resurrect(struct percpu_ref *ref) spin_lock_irqsave(&percpu_ref_switch_lock, flags); - WARN_ON_ONCE(!(ref->percpu_count_ptr & __PERCPU_REF_DEAD)); + WARN_ON_ONCE(!percpu_ref_is_dying(ref)); WARN_ON_ONCE(__ref_is_percpu(ref, &percpu_count)); ref->percpu_count_ptr &= ~__PERCPU_REF_DEAD;