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Message-ID: <ZV6buHrQy2+CJ7xX@debian-scheme>
Date: Thu, 23 Nov 2023 08:24:24 +0800
From: Zhenyu Wang <zhenyuw@...ux.intel.com>
To: Christian Brauner <brauner@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Jan Kara <jack@...e.cz>, Vitaly Kuznetsov <vkuznets@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	David Woodhouse <dwmw2@...radead.org>, Paul Durrant <paul@....org>,
	Oded Gabbay <ogabbay@...nel.org>, Wu Hao <hao.wu@...el.com>,
	Tom Rix <trix@...hat.com>, Moritz Fischer <mdf@...nel.org>,
	Xu Yilun <yilun.xu@...el.com>,
	Zhenyu Wang <zhenyuw@...ux.intel.com>,
	Zhi Wang <zhi.a.wang@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Leon Romanovsky <leon@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
	Frederic Barrat <fbarrat@...ux.ibm.com>,
	Andrew Donnellan <ajd@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Eric Farman <farman@...ux.ibm.com>,
	Matthew Rosato <mjrosato@...ux.ibm.com>,
	Halil Pasic <pasic@...ux.ibm.com>,
	Vineeth Vijayan <vneethv@...ux.ibm.com>,
	Peter Oberparleiter <oberpar@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Tony Krowiak <akrowiak@...ux.ibm.com>,
	Jason Herne <jjherne@...ux.ibm.com>,
	Harald Freudenberger <freude@...ux.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Diana Craciun <diana.craciun@....nxp.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Eric Auger <eric.auger@...hat.com>, Fei Li <fei1.li@...el.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeelb@...gle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Kirti Wankhede <kwankhede@...dia.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-fpga@...r.kernel.org, intel-gvt-dev@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-usb@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-aio@...ck.org, cgroups@...r.kernel.org, linux-mm@...ck.org,
	Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org
Subject: Re: [PATCH v2 1/4] i915: make inject_virtual_interrupt() void

On 2023.11.22 13:48:22 +0100, 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@...nel.org>
> ---
>  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);
>  }

I think it's a little simpler to write as
    if (vgpu->msi_trigger)
            eventfd_signal(vgpu->msi_trigger, 1);

Looks fine with me.

Reviewed-by: Zhenyu Wang <zhenyuw@...ux.intel.com>

Thanks!

>  
>  static void propagate_event(struct intel_gvt_irq *irq,
> 
> -- 
> 2.42.0
> 

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