On Thu, Feb 20, 2020 at 10:48:33AM +0100, Jiri Slaby wrote:

On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:

quoted

The ioreadX() helpers have inconsistent interface.  On some architectures
void *__iomem address argument is a pointer to const, on some not.

Implementations of ioreadX() do not modify the memory under the address
so they can be converted to a "const" version for const-safety and
consistency among architectures.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Kalle Valo <redacted>
---
 drivers/net/wireless/ath/ath5k/ahb.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath5k/ahb.c b/drivers/net/wireless/ath/ath5k/ahb.c
index 2c9cec8b53d9..8bd01df369fb 100644
--- a/drivers/net/wireless/ath/ath5k/ahb.c
+++ b/drivers/net/wireless/ath/ath5k/ahb.c

@@ -138,18 +138,18 @@ static int ath_ahb_probe(struct platform_device *pdev)
 
 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 		/* Enable WMAC AHB arbitration */
-		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+		reg = ioread32((const void __iomem *) AR5K_AR2315_AHB_ARB_CTL);

While I understand why the parameter of ioread32 should be const, I
don't see a reason for these casts on the users' side. What does it
bring except longer code to read?

Because the argument is an int:

drivers/net/wireless/ath/ath5k/ahb.c: In function ‘ath_ahb_probe’:
drivers/net/wireless/ath/ath5k/ahb.c:141:18: warning: passing argument 1 of ‘ioread32’ makes pointer from integer without a cast [-Wint-conversion]
   reg = ioread32(AR5K_AR2315_AHB_ARB_CTL);

Best regards,
Krzysztof