linux-kernel - RE: [PATCH] thermal: int340x: Increase bitmap size

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Date:   Mon, 14 Mar 2022 15:28:57 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Srinivas Pandruvada' <srinivas.pandruvada@...ux.intel.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "amitk@...nel.org" <amitk@...nel.org>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "matthewgarrett@...gle.com" <matthewgarrett@...gle.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] thermal: int340x: Increase bitmap size

From: Srinivas Pandruvada
> Sent: 14 March 2022 14:50
> 
> The number of policies are 10, so can't be supported by the bitmap size
> of u8. Even though there are no platfoms with these many policies, but
> as correctness increase to u16.

You might as well just use 'unsigned int'.
May generate better code and there is still padding
in the structure.

	David

> 
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Fixes: 16fc8eca1975 ("thermal/int340x_thermal: Add additional UUIDs")
> Cc: stable@...r.kernel.org
> ---
>  drivers/thermal/intel/int340x_thermal/int3400_thermal.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index 72acb1f61849..c2d3df302214 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -53,7 +53,7 @@ struct int3400_thermal_priv {
>  	struct art *arts;
>  	int trt_count;
>  	struct trt *trts;
> -	u8 uuid_bitmap;
> +	u16 uuid_bitmap;
>  	int rel_misc_dev_res;
>  	int current_uuid_index;
>  	char *data_vault;
> --
> 2.31.1

-
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