Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) client-ip=2620:137:e000::3:2;
Date:   Wed, 22 Nov 2023 16:05:08 +0100
From:   Jan Kara <jack@suse.cz>
To:     Christian Brauner <brauner@kernel.org>
Cc:     linux-fsdevel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
        Jan Kara <jack@suse.cz>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        David Woodhouse <dwmw2@infradead.org>,
        Paul Durrant <paul@xen.org>, Oded Gabbay <ogabbay@kernel.org>,
        Wu Hao <hao.wu@intel.com>, Tom Rix <trix@redhat.com>,
        Moritz Fischer <mdf@kernel.org>, Xu Yilun <yilun.xu@intel.com>,
        Zhenyu Wang <zhenyuw@linux.intel.com>,
        Zhi Wang <zhi.a.wang@intel.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Leon Romanovsky <leon@kernel.org>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Frederic Barrat <fbarrat@linux.ibm.com>,
        Andrew Donnellan <ajd@linux.ibm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Eric Farman <farman@linux.ibm.com>,
        Matthew Rosato <mjrosato@linux.ibm.com>,
        Halil Pasic <pasic@linux.ibm.com>,
        Vineeth Vijayan <vneethv@linux.ibm.com>,
        Peter Oberparleiter <oberpar@linux.ibm.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Christian Borntraeger <borntraeger@linux.ibm.com>,
        Sven Schnelle <svens@linux.ibm.com>,
        Tony Krowiak <akrowiak@linux.ibm.com>,
        Jason Herne <jjherne@linux.ibm.com>,
        Harald Freudenberger <freude@linux.ibm.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
        Diana Craciun <diana.craciun@oss.nxp.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Eric Auger <eric.auger@redhat.com>, Fei Li <fei1.li@intel.com>,
        Benjamin LaHaise <bcrl@kvack.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Shakeel Butt <shakeelb@google.com>,
        Muchun Song <muchun.song@linux.dev>,
        Kirti Wankhede <kwankhede@nvidia.com>, 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 <axboe@kernel.dk>,
        Pavel Begunkov <asml.silence@gmail.com>,
        io-uring@vger.kernel.org
Subject: Re: [PATCH v2 1/4] i915: make inject_virtual_interrupt() void
Message-ID: <20231122150508.bdkhrdrhlyva7biz@quack3>
References: <20231122-vfs-eventfd-signal-v2-0-bd549b14ce0c@kernel.org>
 <20231122-vfs-eventfd-signal-v2-1-bd549b14ce0c@kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20231122-vfs-eventfd-signal-v2-1-bd549b14ce0c@kernel.org>
Precedence: bulk

On Wed 22-11-23 13:48:22, Christian Brauner wrote:
> The single caller of inject_virtual_interrupt() ignores the return value
> anyway. This allows us to simplify eventfd_signal() in follow-up
> patches.
> 
> Signed-off-by: Christian Brauner <brauner@kernel.org>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  drivers/gpu/drm/i915/gvt/interrupt.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
> index de3f5903d1a7..9665876b4b13 100644
> --- a/drivers/gpu/drm/i915/gvt/interrupt.c
> +++ b/drivers/gpu/drm/i915/gvt/interrupt.c
> @@ -422,7 +422,7 @@ static void init_irq_map(struct intel_gvt_irq *irq)
>  #define MSI_CAP_DATA(offset) (offset + 8)
>  #define MSI_CAP_EN 0x1
>  
> -static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
> +static void inject_virtual_interrupt(struct intel_vgpu *vgpu)
>  {
>  	unsigned long offset = vgpu->gvt->device_info.msi_cap_offset;
>  	u16 control, data;
> @@ -434,10 +434,10 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
>  
>  	/* Do not generate MSI if MSIEN is disabled */
>  	if (!(control & MSI_CAP_EN))
> -		return 0;
> +		return;
>  
>  	if (WARN(control & GENMASK(15, 1), "only support one MSI format\n"))
> -		return -EINVAL;
> +		return;
>  
>  	trace_inject_msi(vgpu->id, addr, data);
>  
> @@ -451,10 +451,10 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
>  	 * returned and don't inject interrupt into guest.
>  	 */
>  	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
> -		return -ESRCH;
> -	if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger, 1) != 1)
> -		return -EFAULT;
> -	return 0;
> +		return;
> +	if (!vgpu->msi_trigger)
> +		return;
> +	eventfd_signal(vgpu->msi_trigger, 1);
>  }
>  
>  static void propagate_event(struct intel_gvt_irq *irq,
> 
> -- 
> 2.42.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR