linux-kernel - Re: [PATCH] [media] mtk-vcodec: fix type mismatches

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Date:	Wed, 13 Jul 2016 15:08:09 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	tiffany lin <tiffany.lin@...iatek.com>,
	linux-kernel@...r.kernel.org,
	Hans Verkuil <hans.verkuil@...co.com>,
	PoChun Lin <pochun.lin@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	linux-mediatek@...ts.infradead.org,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH] [media] mtk-vcodec: fix type mismatches

On Wednesday, July 13, 2016 5:56:26 PM CEST tiffany lin wrote:
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
> > index 6dcae0a0a1f2..0b25a8700877 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c
> > @@ -1028,15 +1028,15 @@ static void mtk_venc_worker(struct work_struct *work)
> >       bs_buf.size = (size_t)dst_buf->planes[0].length;
> >  
> >       mtk_v4l2_debug(2,
> > -                     "Framebuf VA=%p PA=%llx Size=0x%lx;VA=%p PA=0x%llx Size=0x%lx;VA=%p PA=0x%llx Size=%zu",
> > +                     "Framebuf VA=%p PA=%pad Size=0x%zx;VA=%p PA=%pad Size=0x%zx;VA=%p PA=%pad Size=0x%zx",
> >                       frm_buf.fb_addr[0].va,
> > -                     (u64)frm_buf.fb_addr[0].dma_addr,
> > +                     &frm_buf.fb_addr[0].dma_addr,
> >                       frm_buf.fb_addr[0].size,
> >                       frm_buf.fb_addr[1].va,
> > -                     (u64)frm_buf.fb_addr[1].dma_addr,
> > +                     &frm_buf.fb_addr[1].dma_addr,
> >                       frm_buf.fb_addr[1].size,
> >                       frm_buf.fb_addr[2].va,
> > -                     (u64)frm_buf.fb_addr[2].dma_addr,
> > +                     &frm_buf.fb_addr[2].dma_addr,
> >                       frm_buf.fb_addr[2].size);
> This change will make debug message dump address of dma_addr field but
> not the value of the dma_addr we want.
> How about change it from
> PA=%llx -> PA=%u
> (u64)frm_buf.fb_addr[0].dma_addr -> (u32)frm_buf.fb_addr[0].dma_addr,
> 

The %llx works fine with the cast to u64, the change above is mainly for the "%lx"
on a size_t causing a warning.

The change to %pad is done in order to use a consistent output for the
dma_addr_t, which had a leading "0x" in two cases but not in the first
one.

printk interprets %pad as a pointer to a dma_addr_t and prints the
address, not the pointer to it, see Documentation/printk-formats.txt,
which lets you avoid the type cast as well as the 0x.

	Arnd