linux-kernel - Re: [PATCH] media: atomisp: Use clamp_t() in ia_css_eed1_8_vmem

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Message-ID: <20240906081542.5cb0c142@foz.lan>
Date: Fri, 6 Sep 2024 08:15:42 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>, Hans de Goede
 <hdegoede@...hat.com>
Cc: David.Laight@...LAB.COM, Mauro Carvalho Chehab <mchehab@...nel.org>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org, linux-media@...r.kernel.org,
 linux-staging@...ts.linux.dev
Subject: Re: [PATCH] media: atomisp: Use clamp_t() in
 ia_css_eed1_8_vmem_encode()

Em Sat, 27 Jul 2024 14:51:56 +0200
Christophe JAILLET <christophe.jaillet@...adoo.fr> escreveu:

> Using clamp_t() instead of min_t(max_t()) is easier to read.
> 
> It also reduces the size of the preprocessed files by ~ 193 ko.
> (see [1] for a discussion about it)
> 
> $ ls -l ia_css_eed1_8.host*.i
>  4829993 27 juil. 14:36 ia_css_eed1_8.host.old.i
>  4636649 27 juil. 14:42 ia_css_eed1_8.host.new.i
> 
> [1]: https://lore.kernel.org/all/23bdb6fc8d884ceebeb6e8b8653b8cfe@AcuMS.aculab.com/
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  .../isp/kernels/eed1_8/ia_css_eed1_8.host.c   | 24 +++++++++----------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c b/drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c
> index e4fc90f88e24..96c13ebc4331 100644
> --- a/drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c
> +++ b/drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c
> @@ -172,25 +172,25 @@ ia_css_eed1_8_vmem_encode(
>  		base = shuffle_block * i;
>  
>  		for (j = 0; j < IA_CSS_NUMBER_OF_DEW_ENHANCE_SEGMENTS; j++) {
> -			to->e_dew_enh_x[0][base + j] = min_t(int, max_t(int,
> -							     from->dew_enhance_seg_x[j], 0),
> -							     8191);
> -			to->e_dew_enh_y[0][base + j] = min_t(int, max_t(int,
> -							     from->dew_enhance_seg_y[j], -8192),
> -							     8191);
> +			to->e_dew_enh_x[0][base + j] = clamp_t(int,
> +							       from->dew_enhance_seg_x[j],
> +							       0, 8191);
> +			to->e_dew_enh_y[0][base + j] = clamp_t(int,
> +							       from->dew_enhance_seg_y[j],
> +							       -8192, 8191);

Such change introduces two warnings on smatch:

drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c: drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c:177 ia_css_eed1_8_vmem_encode() warn: assigning (-8192) to unsigned variable 'to->e_dew_enh_y[0][base + j]'
drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c: drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/ia_css_eed1_8.host.c:182 ia_css_eed1_8_vmem_encode() warn: assigning (-8192) to unsigned variable 'to->e_dew_enh_a[0][base + j]'

Should dew_enhance_seg_x and dew_enhance_seg_y be converted to signed?


Thanks,
Mauro