linux-kernel - Re: [PATCH 2/3] soc: qcom: rpmh-rsc: Loop over less bits in irq handler

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Date:   Thu, 23 Apr 2020 22:37:20 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Maulik Shah <mkshah@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH 2/3] soc: qcom: rpmh-rsc: Loop over less bits in irq
 handler

On Thu 23 Apr 21:54 PDT 2020, Stephen Boyd wrote:

> readl returns a u32, and BITS_PER_LONG is different on 32-bit vs. 64-bit
> architectures. Let's make the type we stash the readl into a u32 and
> then loop over the bits set in that type instead of potentially looping
> over more bits than we will ever need to.
> 
> Cc: Maulik Shah <mkshah@...eaurora.org>
> Cc: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/soc/qcom/rpmh-rsc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
> index 76e0294a672c..462dd267afef 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -365,13 +365,13 @@ static irqreturn_t tcs_tx_done(int irq, void *p)
>  {
>  	struct rsc_drv *drv = p;
>  	int i, j, err = 0;
> -	unsigned long irq_status;
> +	u32 irq_status;
>  	const struct tcs_request *req;
>  	struct tcs_cmd *cmd;
>  
>  	irq_status = readl_relaxed(drv->tcs_base + RSC_DRV_IRQ_STATUS);
>  
> -	for_each_set_bit(i, &irq_status, BITS_PER_LONG) {
> +	for_each_set_bit(i, &irq_status, BITS_PER_TYPE(u32)) {
>  		req = get_req_from_tcs(drv, i);
>  		if (!req) {
>  			WARN_ON(1);
> -- 
> Sent by a computer, using git, on the internet
>