linux-kernel - Re: [PATCH v2 1/5] soc: qcom: smem: Use le32_to

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Date:   Fri, 15 Sep 2017 11:39:07 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Chris Lew <clew@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, andy.gross@...aro.org,
        david.brown@...aro.org, aneela@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] soc: qcom: smem: Use le32_to_cpu for partition
 size comparison

On 09/14, Chris Lew wrote:
> Endianness can vary in the system, add le32_to_cpu when comparing
> size values from smem.
> 
> Signed-off-by: Chris Lew <clew@...eaurora.org>
> ---
> 
> Changes since v1:
> - New change
> 
>  drivers/soc/qcom/smem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index c28275be0038..db04c45d4132 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -698,7 +698,7 @@ static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
>  			return -EINVAL;
>  		}
>  
> -		if (header->size != entry->size) {
> +		if (le32_to_cpu(header->size) != le32_to_cpu(entry->size)) {

Also, it doesn't really matter. We're comparing two numbers with
the same endianness, so comparing them for equality before or
after swapping makes no difference. Sparse also (correctly)
doesn't complain here, because adding the conversion is not
necessary. Drop this patch?

-- 
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