linux-kernel - Re: [PATCH] drm/amd/amdkfd: Fix large framesize for kfd_smi_ev

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Date:   Thu, 21 May 2020 09:06:37 -0400
From:   Aurabindo Pillai <aurabindo.pillai@....com>
To:     Felix Kuehling <felix.kuehling@....com>
Cc:     alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Amber Lin <Amber.Lin@....com>
Subject: Re: [PATCH] drm/amd/amdkfd: Fix large framesize for kfd_smi_ev_read()

On 05/20, Felix Kuehling wrote:
> Am 2020-05-20 um 9:53 a.m. schrieb Aurabindo Pillai:
> > The buffer allocated is of 1024 bytes. Allocate this from
> > heap instead of stack.
> >
> > Also remove check for stack size since we're allocating from heap
> >
> > Signed-off-by: Aurabindo Pillai <aurabindo.pillai@....com>
> > Tested-by: Amber Lin <Amber.Lin@....com>
> 
> See one comment inline. With that fixed, the patch is
> 
> Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
> 
> 
> > ---
> >  drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 26 +++++++++++++++------
> >  1 file changed, 19 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
> > index f5fd18eacf0d..5aebe169f8c6 100644
> > --- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
> > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
> > @@ -77,9 +77,11 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
> >  	int ret;
> >  	size_t to_copy;
> >  	struct kfd_smi_client *client = filep->private_data;
> > -	unsigned char buf[MAX_KFIFO_SIZE];
> > +	unsigned char *buf;
> >  
> > -	BUILD_BUG_ON(MAX_KFIFO_SIZE > 1024);
> > +	buf = kzalloc(MAX_KFIFO_SIZE * sizeof(*buf), GFP_KERNEL);
> 
> kzalloc is not necessary here, you could use kmalloc. The part of that
> allocation that matters will be overwritten by kfifo_out.
> 
> Regards,
>   Felix
> 
>

Thank you Felix, Alex for the review. I shall make that change and submit it.


Thanks & Regards,
Aurabindo

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