linux-kernel - Re: [PATCH] coresight: Use devm_bitmap

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Date:   Sat, 23 Oct 2021 12:36:41 -0700
From:   Joe Perches <joe@...ches.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        mathieu.poirier@...aro.org, suzuki.poulose@....com,
        mike.leach@...aro.org, leo.yan@...aro.org,
        alexander.shishkin@...ux.intel.com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com
Cc:     coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] coresight: Use devm_bitmap_zalloc when applicable

On Sat, 2021-10-23 at 21:24 +0200, Christophe JAILLET wrote:
> 'drvdata->chs.guaranteed' is a bitmap. So use 'devm_bitmap_kzalloc()' to
> simplify code, improve the semantic and avoid some open-coded arithmetic
> in allocator arguments.
[]
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
[]
> @@ -862,7 +862,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>  	struct stm_drvdata *drvdata;
>  	struct resource *res = &adev->res;
>  	struct resource ch_res;
> -	size_t bitmap_size;
>  	struct coresight_desc desc = { 0 };
>  
>  	desc.name = coresight_alloc_device_name(&stm_devs, dev);
> @@ -904,9 +903,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>  	else
>  		drvdata->numsp = stm_num_stimulus_port(drvdata);
>  
> -	bitmap_size = BITS_TO_LONGS(drvdata->numsp) * sizeof(long);
> -
> -	guaranteed = devm_kzalloc(dev, bitmap_size, GFP_KERNEL);
> +	guaranteed = devm_bitmap_zalloc(dev, drvdata->numsp, GFP_KERNEL);
>  	if (!guaranteed)
>  		return -ENOMEM;
>  	drvdata->chs.guaranteed = guaranteed;

guaranteed is also pretty useless