From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 44ACF43ABE; Wed, 22 Nov 2023 12:49:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sH8Tm1wP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 917EAC433D9; Wed, 22 Nov 2023 12:49:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700657391; bh=hkU4HuuqkNDsQyioSQIrRKs3Tgv1T8STkBb7WyDQZe8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=sH8Tm1wP4EJijR7jWPvNmVl3mBtGkN3wNNGbSdSvEFuMdvkY1E+QcVQvJITT2RIsW PEZ3zcrNhYwSEpVPHfg4a4zhavH8mDv02NXVgiIbz8f69fdg4BB2d9Zli1lRzYSb6z EhsClQyaa8F9yvudTBUtM4my+Rx0dMR0LAc+gsTxCigYWjUsjR3qlZZqilJVkyWppo yGn3YPu1G4hIzrWGGgQSL4WErzUbY4QLyvvdHlzbxEk04+A1PVD2meTrRkiqNGZrYf zKCJTM3AbkjVz3eM9Q0Xi3c64W42/3N1VaWB+hvIpTkCgb37ZYi4HaREDHPLbxjZgc W9uhC2VfgcM3w== From: Christian Brauner Date: Wed, 22 Nov 2023 13:48:24 +0100 Subject: [PATCH v2 3/4] eventfd: simplify eventfd_signal_mask() Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20231122-vfs-eventfd-signal-v2-3-bd549b14ce0c@kernel.org> References: <20231122-vfs-eventfd-signal-v2-0-bd549b14ce0c@kernel.org> In-Reply-To: <20231122-vfs-eventfd-signal-v2-0-bd549b14ce0c@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Christoph Hellwig , Jan Kara , Vitaly Kuznetsov , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, David Woodhouse , Paul Durrant , Oded Gabbay , Wu Hao , Tom Rix , Moritz Fischer , Xu Yilun , Zhenyu Wang , Zhi Wang , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter , Leon Romanovsky , Jason Gunthorpe , Frederic Barrat , Andrew Donnellan , Arnd Bergmann , Greg Kroah-Hartman , Eric Farman , Matthew Rosato , Halil Pasic , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Tony Krowiak , Jason Herne , Harald Freudenberger , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Diana Craciun , Alex Williamson , Eric Auger , Fei Li , Benjamin LaHaise , Christian Brauner , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Kirti Wankhede , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fpga@vger.kernel.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-rdma@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-usb@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-aio@kvack.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Jens Axboe , Pavel Begunkov , io-uring@vger.kernel.org X-Mailer: b4 0.13-dev-26615 X-Developer-Signature: v=1; a=openpgp-sha256; l=3315; i=brauner@kernel.org; h=from:subject:message-id; bh=hkU4HuuqkNDsQyioSQIrRKs3Tgv1T8STkBb7WyDQZe8=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMaTG/liTnx+1a0vsCaGMN23r18xIsnV/pBwn1ZPp37Mqs 7FRsi+uo5SFQYyLQVZMkcWh3SRcbjlPxWajTA2YOaxMIEMYuDgFYCLd4YwMmxu+PXlzuflnQNcx jdSWzQFP5u+/ce54mkHTWs4J/1MYfRgZVub+qv3K3/m32t58z12JNyZxGoI5uyT1mLNNT0rt0T7 KCQA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 The eventfd_signal_mask() helper was introduced for io_uring and similar to eventfd_signal() it always passed 1 for @n. So don't bother with that argument at all. Signed-off-by: Christian Brauner --- fs/eventfd.c | 7 ++++--- include/linux/eventfd.h | 5 ++--- io_uring/io_uring.c | 4 ++-- 3 files changed, 8 insertions(+), 8 deletions(-) diff --git a/fs/eventfd.c b/fs/eventfd.c index dc9e01053235..a9a6de920fb4 100644 --- a/fs/eventfd.c +++ b/fs/eventfd.c @@ -43,9 +43,10 @@ struct eventfd_ctx { int id; }; -__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask) +__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask) { unsigned long flags; + __u64 n = 1; /* * Deadlock or stack overflow issues can happen if we recurse here @@ -68,7 +69,7 @@ __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask) current->in_eventfd = 0; spin_unlock_irqrestore(&ctx->wqh.lock, flags); - return n; + return n == 1; } /** @@ -84,7 +85,7 @@ __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask) */ __u64 eventfd_signal(struct eventfd_ctx *ctx) { - return eventfd_signal_mask(ctx, 1, 0); + return eventfd_signal_mask(ctx, 0); } EXPORT_SYMBOL_GPL(eventfd_signal); diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h index 562089431551..4f8aac7eb62a 100644 --- a/include/linux/eventfd.h +++ b/include/linux/eventfd.h @@ -36,7 +36,7 @@ struct file *eventfd_fget(int fd); struct eventfd_ctx *eventfd_ctx_fdget(int fd); struct eventfd_ctx *eventfd_ctx_fileget(struct file *file); __u64 eventfd_signal(struct eventfd_ctx *ctx); -__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask); +__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask); int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait, __u64 *cnt); void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt); @@ -63,8 +63,7 @@ static inline int eventfd_signal(struct eventfd_ctx *ctx) return -ENOSYS; } -static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, - unsigned mask) +static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, unsigned mask) { return -ENOSYS; } diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index ed254076c723..70170a41eac4 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -558,7 +558,7 @@ static void io_eventfd_ops(struct rcu_head *rcu) int ops = atomic_xchg(&ev_fd->ops, 0); if (ops & BIT(IO_EVENTFD_OP_SIGNAL_BIT)) - eventfd_signal_mask(ev_fd->cq_ev_fd, 1, EPOLL_URING_WAKE); + eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE); /* IO_EVENTFD_OP_FREE_BIT may not be set here depending on callback * ordering in a race but if references are 0 we know we have to free @@ -594,7 +594,7 @@ static void io_eventfd_signal(struct io_ring_ctx *ctx) goto out; if (likely(eventfd_signal_allowed())) { - eventfd_signal_mask(ev_fd->cq_ev_fd, 1, EPOLL_URING_WAKE); + eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE); } else { atomic_inc(&ev_fd->refs); if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_SIGNAL_BIT), &ev_fd->ops)) -- 2.42.0