linux-kernel - Re: [PATCH 2/3] dma-debug: simplify counting of preallocated requests

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Date:   Tue, 8 May 2018 10:50:06 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org
Cc:     linux-arch@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        Michal Simek <monstr@...str.eu>,
        Vincent Chen <deanbo422@...il.com>,
        linux-c6x-dev@...ux-c6x.org, linux-parisc@...r.kernel.org,
        linux-sh@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        openrisc@...ts.librecores.org, Greentime Hu <green.hu@...il.com>,
        linux-alpha@...r.kernel.org, sparclinux@...r.kernel.org,
        nios2-dev@...ts.rocketboards.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] dma-debug: simplify counting of preallocated requests

On 24/04/18 15:02, Christoph Hellwig wrote:
> Just keep a single variable with a descriptive name instead of two
> with confusing names.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   lib/dma-debug.c | 20 ++++----------------
>   1 file changed, 4 insertions(+), 16 deletions(-)
> 
> diff --git a/lib/dma-debug.c b/lib/dma-debug.c
> index 712a897174e4..075253cb613b 100644
> --- a/lib/dma-debug.c
> +++ b/lib/dma-debug.c
> @@ -132,7 +132,7 @@ static u32 min_free_entries;
>   static u32 nr_total_entries;
>   
>   /* number of preallocated entries requested by kernel cmdline */
> -static u32 req_entries;
> +static u32 nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
>   
>   /* debugfs dentry's for the stuff above */
>   static struct dentry *dma_debug_dent        __read_mostly;
> @@ -1011,7 +1011,6 @@ void dma_debug_add_bus(struct bus_type *bus)
>   
>   static int dma_debug_init(void)
>   {
> -	u32 num_entries;
>   	int i;
>   
>   	/* Do not use dma_debug_initialized here, since we really want to be
> @@ -1032,12 +1031,7 @@ static int dma_debug_init(void)
>   		return 0;
>   	}
>   
> -	if (req_entries)
> -		num_entries = req_entries;
> -	else
> -		num_entries = PREALLOC_DMA_DEBUG_ENTRIES;
> -
> -	if (prealloc_memory(num_entries) != 0) {
> +	if (prealloc_memory(nr_prealloc_entries) != 0) {
>   		pr_err("DMA-API: debugging out of memory error - disabled\n");
>   		global_disable = true;
>   
> @@ -1068,16 +1062,10 @@ static __init int dma_debug_cmdline(char *str)
>   
>   static __init int dma_debug_entries_cmdline(char *str)
>   {
> -	int res;
> -
>   	if (!str)
>   		return -EINVAL;
> -
> -	res = get_option(&str, &req_entries);
> -
> -	if (!res)
> -		req_entries = 0;
> -
> +	if (!get_option(&str, &nr_prealloc_entries))
> +		nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
>   	return 0;
>   }
>   
>