Re: [RESEND PATCH v2 9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
On Mon, Feb 24, 2020 at 01:54:00PM +0100, Geert Uytterhoeven wrote:
> Hi Krzysztof,
>
> On Mon, Feb 24, 2020 at 1:47 PM Krzysztof Kozlowski wrote:
> > On Thu, Feb 20, 2020 at 10:48:33AM +0100, Jiri Slaby wrote:
> > > On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> > > > 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
> > > > Acked-by: Kalle Valo
> > > > ---
> > > > 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);
>
> That's an argument for keeping the cast to "void __iomem *", not for
> adding the "const", right?
Yes, correct. Maybe I misunderstood the question... The const on the
other hand does not have to be in the cast. It is merely for making it
consistent with interface. It is not required. I also mentioned it in
the cover letter:
"PAtches 5-9 are optional cleanup, without actual impact"
Feel free to ignore this one if it is not worth the effort.
Best regards,
Krzysztof
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RE: [RESEND PATCH v2 9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
From: Geert Uytterhoeven
> Sent: 24 February 2020 12:54
> To: Krzysztof Kozlowski
...
> > > > 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);
>
> That's an argument for keeping the cast to "void __iomem *", not for
> adding the "const", right?
Or more likely change the definitions to use a struct for the layout.
That also stops the constants being used in the wrong place.
David
-
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Re: [RESEND PATCH v2 9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
Hi Krzysztof,
On Mon, Feb 24, 2020 at 1:47 PM Krzysztof Kozlowski wrote:
> On Thu, Feb 20, 2020 at 10:48:33AM +0100, Jiri Slaby wrote:
> > On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> > > 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
> > > Acked-by: Kalle Valo
> > > ---
> > > 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);
That's an argument for keeping the cast to "void __iomem *", not for
adding the "const", right?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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Re: [RESEND PATCH v2 9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
On Thu, Feb 20, 2020 at 10:48:33AM +0100, Jiri Slaby wrote:
> On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> > 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
> > Acked-by: Kalle Valo
> > ---
> > 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
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Re: [RESEND PATCH v2 9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> 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
> Acked-by: Kalle Valo
> ---
> 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?
thanks,
--
js
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[RESEND PATCH v2 9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
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
Acked-by: Kalle Valo
---
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);
reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
/* Enable global WMAC swapping */
- reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
+ reg = ioread32((const void __iomem *) AR5K_AR2315_BYTESWAP);
reg |= AR5K_AR2315_BYTESWAP_WMAC;
iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
} else {
/* Enable WMAC DMA access (assuming 5312 or 231x*/
/* TODO: check other platforms */
- reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
+ reg = ioread32((const void __iomem *) AR5K_AR5312_ENABLE);
if (to_platform_device(ah->dev)->id == 0)
reg |= AR5K_AR5312_ENABLE_WLAN0;
else
@@ -202,12 +202,12 @@ static int ath_ahb_remove(struct platform_device *pdev)
if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
/* Disable WMAC AHB arbitration */
- reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+ reg = ioread32((const void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
} else {
/*Stop DMA access */
- reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
+ reg = ioread32((const void __iomem *) AR5K_AR5312_ENABLE);
if (to_platform_device(ah->dev)->id == 0)
reg &= ~AR5K_AR5312_ENABLE_WLAN0;
else
--
2.17.1
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