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Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mmvgh-006fFv-FP; Tue, 16 Nov 2021 10:27:40 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 022CB300093; Tue, 16 Nov 2021 11:27:39 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id E6A292D7AEC49; Tue, 16 Nov 2021 11:27:38 +0100 (CET) Date: Tue, 16 Nov 2021 11:27:38 +0100 From: Peter Zijlstra To: Minchan Kim Cc: Andrew Morton , Sergey Senozhatsky , linux-mm , LKML Subject: Re: [PATCH v2 7/9] locking/rwlocks: introduce write_lock_nested Message-ID: References: <20211115185909.3949505-1-minchan@kernel.org> <20211115185909.3949505-8-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211115185909.3949505-8-minchan@kernel.org> X-HE-Tag: 1637075962-634839 X-Stat-Signature: a91oj4hpj47dnqbs9j5ud69be8q6iwsw Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=R+Q26e5a; dmarc=none; spf=none (imf02.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 216.40.44.6) smtp.mailfrom=peterz@infradead.org X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 9974E700AE38 X-HE-Tag: 1637076409-658931 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: On Mon, Nov 15, 2021 at 10:59:07AM -0800, Minchan Kim wrote: > In preparation for converting bit_spin_lock to rwlock in zsmalloc > so that multiple writers of zspages can run at the same time but > those zspages are supposed to be different zspage instance. Thus, > it's not deadlock. This patch adds write_lock_nested to support > the case for LOCKDEP. > > Cc: Peter Zijlstra (Intel) > Signed-off-by: Minchan Kim > --- > include/linux/rwlock.h | 6 ++++++ > include/linux/rwlock_api_smp.h | 9 +++++++++ > include/linux/rwlock_rt.h | 6 ++++++ > include/linux/spinlock_api_up.h | 1 + > kernel/locking/spinlock.c | 6 ++++++ > kernel/locking/spinlock_rt.c | 12 ++++++++++++ > 6 files changed, 40 insertions(+) Acked-by: Peter Zijlstra (Intel)