Re: [PATCH] soc: qcom: smp2p: fix __iomem annotation on entry->value pointer

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 6/23/26 10:59 AM, Ben Dooks wrote:
> The entry->value is passed to readl() so should be marked __iomem
> so remove these sparse warnings by marking it __iomem and do the
> relevant casting to ensure no further warnings:
> 
> drivers/soc/qcom/smp2p.c:280:64: warning: incorrect type in argument 1 (different address spaces)
> drivers/soc/qcom/smp2p.c:280:64:    expected void const volatile [noderef] __iomem *addr
> drivers/soc/qcom/smp2p.c:280:64:    got unsigned int [usertype] *value
> drivers/soc/qcom/smp2p.c:318:34: warning: incorrect type in argument 1 (different address spaces)
> drivers/soc/qcom/smp2p.c:318:34:    expected void const volatile [noderef] __iomem *addr
> drivers/soc/qcom/smp2p.c:318:34:    got unsigned int [usertype] *value
> drivers/soc/qcom/smp2p.c:446:26: warning: incorrect type in argument 1 (different address spaces)
> drivers/soc/qcom/smp2p.c:446:26:    expected void const volatile [noderef] __iomem *addr
> drivers/soc/qcom/smp2p.c:446:26:    got unsigned int [usertype] *value
> drivers/soc/qcom/smp2p.c:501:33: warning: incorrect type in argument 1 (different address spaces)
> drivers/soc/qcom/smp2p.c:501:33:    expected void const volatile [noderef] __iomem *addr
> drivers/soc/qcom/smp2p.c:501:33:    got unsigned int [usertype] *value
> drivers/soc/qcom/smp2p.c:504:26: warning: incorrect type in argument 2 (different address spaces)
> drivers/soc/qcom/smp2p.c:504:26:    expected void volatile [noderef] __iomem *addr
> drivers/soc/qcom/smp2p.c:504:26:    got unsigned int [usertype] *value
> 
> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
> ---

+Chris, is this actually iomem, or should this be treated as normal
memory (since this is just coming from SMEM, perhaps just memmap()?)

Konrad

>  drivers/soc/qcom/smp2p.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
> index af0ceeaf6e07..fef6f17c3257 100644
> --- a/drivers/soc/qcom/smp2p.c
> +++ b/drivers/soc/qcom/smp2p.c
> @@ -102,7 +102,7 @@ struct smp2p_entry {
>  	struct qcom_smp2p *smp2p;
>  
>  	const char *name;
> -	u32 *value;
> +	u32 __iomem *value;
>  	u32 last_value;
>  
>  	struct irq_domain *domain;
> @@ -276,7 +276,7 @@ static void qcom_smp2p_start_in(struct qcom_smp2p *smp2p)
>  		list_for_each_entry(entry, &smp2p->inbound, node) {
>  			memcpy(buf, in->entries[i].name, sizeof(buf));
>  			if (!strcmp(buf, entry->name)) {
> -				entry->value = &in->entries[i].value;
> +				entry->value = (u32 __iomem *)&in->entries[i].value;
>  				entry->last_value = readl(entry->value);
>  				break;
>  			}
> @@ -302,7 +302,7 @@ static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p)
>  		list_for_each_entry(entry, &smp2p->inbound, node) {
>  			memcpy(buf, in->entries[i].name, sizeof(buf));
>  			if (!strcmp(buf, entry->name)) {
> -				entry->value = &in->entries[i].value;
> +				entry->value = (u32 __iomem *)&in->entries[i].value;
>  				break;
>  			}
>  		}
> @@ -528,7 +528,7 @@ static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p,
>  	memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME);
>  
>  	/* Make the logical entry reference the physical value */
> -	entry->value = &out->entries[out->valid_entries].value;
> +	entry->value = (u32 __iomem *)&out->entries[out->valid_entries].value;
>  
>  	out->valid_entries++;
>