From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75507EB64DD for ; Thu, 13 Jul 2023 10:07:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234475AbjGMKHa (ORCPT ); Thu, 13 Jul 2023 06:07:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234623AbjGMKGn (ORCPT ); Thu, 13 Jul 2023 06:06:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DFBE212B; Thu, 13 Jul 2023 03:06:34 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 04D7760ADC; Thu, 13 Jul 2023 10:06:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34C10C433D9; Thu, 13 Jul 2023 10:06:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689242793; bh=+Df4cQ3XZPwLfFxJgIqPrDY4l9UAdwCjr9DGoW3/ojk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=j+ukf52dvZ+nUEPwpL9/EYruyhEbJbg7d1yjKDMcd3GOYxX7RclutpFcH5UUHlkpI fnIEho3ycJz28JfRAPfizI9cf3F0lqh4jC9ZF+UZUl5JTb6HfdwpWlIJ9bsmZ0DsOQ PAjBHJokUk/yF6GqX5PHCHsaDKT13j+MVST75N+zeiC2em3PJTUKrCtRR1KKmsmMCX MYnQq0YQbswQU++9LLW3pgHXNsdqcZtbb04btB9J/lGIIF9SRPTFcmVmql2ih2n6bH BAMadKjZaQhxN2qUstf+rs137LSKZ/kMx1juo/8V60a80JJWvq1eqYcfgXe/BuR2sH +vKmJxA1p+x+A== From: Christian Brauner Date: Thu, 13 Jul 2023 12:05:38 +0200 Subject: [PATCH 2/2] eventfd: simplify eventfd_signal_mask() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20230713-vfs-eventfd-signal-v1-2-7fda6c5d212b@kernel.org> References: <20230713-vfs-eventfd-signal-v1-0-7fda6c5d212b@kernel.org> In-Reply-To: <20230713-vfs-eventfd-signal-v1-0-7fda6c5d212b@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: 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-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=4338; i=brauner@kernel.org; h=from:subject:message-id; bh=+Df4cQ3XZPwLfFxJgIqPrDY4l9UAdwCjr9DGoW3/ojk=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMaSsP1NbdfmkaWaxQvZah7/MWs/ufCrO2q82U2T1DIWDSy0u LwzX6ChhYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZiIshkjww4t2ytlzT8ElQsqm7Su/N b3T10XyfCvYZ2XvvOJclnpCIbvvh+/WjLaTozOzj3stenvds+qri//VkTNPGGwWHTi+Uc8AA== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org 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 --- drivers/gpu/drm/i915/gvt/interrupt.c | 2 +- fs/eventfd.c | 9 +++++---- include/linux/eventfd.h | 9 ++++----- io_uring/io_uring.c | 4 ++-- 4 files changed, 12 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c index 3d9e09c2add4..31aff6f733d4 100644 --- a/drivers/gpu/drm/i915/gvt/interrupt.c +++ b/drivers/gpu/drm/i915/gvt/interrupt.c @@ -435,7 +435,7 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu) */ if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status)) return -ESRCH; - if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger) != 1) + if (vgpu->msi_trigger && !eventfd_signal(vgpu->msi_trigger)) return -EFAULT; return 0; } diff --git a/fs/eventfd.c b/fs/eventfd.c index dc9e01053235..077be5da72bd 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) +bool 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; } /** @@ -82,9 +83,9 @@ __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask) * * Returns the amount by which the counter was incremented. */ -__u64 eventfd_signal(struct eventfd_ctx *ctx) +bool 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..0155ee25f7c8 100644 --- a/include/linux/eventfd.h +++ b/include/linux/eventfd.h @@ -35,8 +35,8 @@ void eventfd_ctx_put(struct eventfd_ctx *ctx); 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); +bool eventfd_signal(struct eventfd_ctx *ctx); +bool 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); @@ -58,13 +58,12 @@ static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd) return ERR_PTR(-ENOSYS); } -static inline int eventfd_signal(struct eventfd_ctx *ctx) +static inline bool eventfd_signal(struct eventfd_ctx *ctx) { return -ENOSYS; } -static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, - unsigned mask) +static inline bool 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 e8096d502a7c..a9359ef73935 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -537,7 +537,7 @@ 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 @@ -573,7 +573,7 @@ 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)) -- 2.34.1