[PATCH v2 0/3] of: Make of_match_node() an inline stub for CONFIG_OF=n

[PATCH v2 0/3] of: Make of_match_node() an inline stub for CONFIG_OF=n

[Florian Fainelli]

Hi all,

This patch series makes of_match_node() an inline stub for CONFIG_OF=n. kbuild
reported two build errors which are fixed as preriquisite patches.

This is based on Linus' master, not sure which tree would merge this, Frank's?

Thanks!

Florian Fainelli (3):
  mfd: max8998: Remove CONFIG_OF around max8998_dt_match
  net: macb: Remove CONFIG_OF around DT match table
  of: Make of_match_node() an inline stub for CONFIG_OF=n

 drivers/mfd/max8998.c               | 2 --
 drivers/net/ethernet/cadence/macb.c | 2 --
 include/linux/of.h                  | 6 +++++-
 3 files changed, 5 insertions(+), 5 deletions(-)

-- 
2.9.3

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[PATCH v2 1/3] mfd: max8998: Remove CONFIG_OF around max8998_dt_match

[Florian Fainelli]

A subsequent patch is going to make of_match_node() an inline stub when
CONFIG_OF is disabled which will properly take care of having the compiler
eliminate the variable. To avoid more #ifdef/#else, just always make the match
table available.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/mfd/max8998.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
index 4c33b8063bc3..372f681ec1bb 100644
--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -129,14 +129,12 @@ int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 }
 EXPORT_SYMBOL(max8998_update_reg);
 
-#ifdef CONFIG_OF
 static const struct of_device_id max8998_dt_match[] = {
 	{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
 	{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
 	{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
 	{},
 };
-#endif
 
 /*
  * Only the common platform data elements for max8998 are parsed here from the
-- 
2.9.3

Re: [PATCH v2 1/3] mfd: max8998: Remove CONFIG_OF around max8998_dt_match

[Lee Jones]

On Tue, 11 Apr 2017, Florian Fainelli wrote:

> A subsequent patch is going to make of_match_node() an inline stub when
> CONFIG_OF is disabled which will properly take care of having the compiler
> eliminate the variable. To avoid more #ifdef/#else, just always make the match
> table available.
> 
> Signed-off-by: Florian Fainelli <f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/mfd/max8998.c | 2 --
>  1 file changed, 2 deletions(-)

If it works, great!

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
  
> diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
> index 4c33b8063bc3..372f681ec1bb 100644
> --- a/drivers/mfd/max8998.c
> +++ b/drivers/mfd/max8998.c
> @@ -129,14 +129,12 @@ int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
>  }
>  EXPORT_SYMBOL(max8998_update_reg);
>  
> -#ifdef CONFIG_OF
>  static const struct of_device_id max8998_dt_match[] = {
>  	{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
>  	{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
>  	{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
>  	{},
>  };
> -#endif
>  
>  /*
>   * Only the common platform data elements for max8998 are parsed here from the

-- 
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Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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[PATCH v2 2/3] net: macb: Remove CONFIG_OF around DT match table

[Florian Fainelli]

A subsequent patch is going to make of_match_node() an inline stub when
CONFIG_OF is disabled, which will let the compiler eliminate unused variables.
In order not to clutter the code more, remove the CONFIG_OF #ifdef such that
macb_dt_ids and what it references are always defined.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/ethernet/cadence/macb.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 30606b11b128..01016e9525ee 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -2811,7 +2811,6 @@ static int macb_init(struct platform_device *pdev)
 	return 0;
 }
 
-#if defined(CONFIG_OF)
 /* 1518 rounded up */
 #define AT91ETHER_MAX_RBUFF_SZ	0x600
 /* max number of receive buffers */
@@ -3215,7 +3214,6 @@ static const struct of_device_id macb_dt_ids[] = {
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, macb_dt_ids);
-#endif /* CONFIG_OF */
 
 static const struct macb_config default_gem_config = {
 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
-- 
2.9.3

Re: [PATCH v2 2/3] net: macb: Remove CONFIG_OF around DT match table

[Rob Herring]

On Tue, Apr 11, 2017 at 11:41 PM, Florian Fainelli <f.fainelli@gmail.com> wrote:
> A subsequent patch is going to make of_match_node() an inline stub when
> CONFIG_OF is disabled, which will let the compiler eliminate unused variables.
> In order not to clutter the code more, remove the CONFIG_OF #ifdef such that
> macb_dt_ids and what it references are always defined.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  drivers/net/ethernet/cadence/macb.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 30606b11b128..01016e9525ee 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -2811,7 +2811,6 @@ static int macb_init(struct platform_device *pdev)
>         return 0;
>  }
>
> -#if defined(CONFIG_OF)
>  /* 1518 rounded up */
>  #define AT91ETHER_MAX_RBUFF_SZ 0x600
>  /* max number of receive buffers */
> @@ -3215,7 +3214,6 @@ static const struct of_device_id macb_dt_ids[] = {
>         { /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, macb_dt_ids);

Did you actually check that the compiler can eliminate things when
modules are enabled? Because it's not going to be able to eliminate
MODULE_DEVICE_TABLE entry AFAICT.

Rob

[PATCH v2 3/3] of: Make of_match_node() an inline stub for CONFIG_OF=n

[Florian Fainelli]

Make of_match_node() an inline function when CONFIG_OF=n which allows the
compiler to eliminate warnings about unused variables.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 include/linux/of.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/of.h b/include/linux/of.h
index 21e6323de0f3..2803a85e81ec 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -839,7 +839,11 @@ static inline void of_property_clear_flag(struct property *p, unsigned long flag
 }
 
 #define of_match_ptr(_ptr)	NULL
-#define of_match_node(_matches, _node)	NULL
+static inline const struct of_device_id *of_match_node(
+	const struct of_device_id *matches, const struct device_node *node)
+{
+	return NULL;
+}
 #endif /* CONFIG_OF */
 
 /* Default string compare functions, Allow arch asm/prom.h to override */
-- 
2.9.3

Re: [PATCH v2 3/3] of: Make of_match_node() an inline stub for CONFIG_OF=n

[kbuild test robot]

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Hi Florian,

[auto build test ERROR on ljones-mfd/for-mfd-next]
[also build test ERROR on v4.11-rc6 next-20170412]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Florian-Fainelli/of-Make-of_match_node-an-inline-stub-for-CONFIG_OF-n/20170412-160916
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: arm-s3c2410_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/i2c/busses/i2c-s3c2410.c: In function 's3c24xx_get_device_quirks':
>> drivers/i2c/busses/i2c-s3c2410.c:174:25: error: 's3c24xx_i2c_match' undeclared (first use in this function)
      match = of_match_node(s3c24xx_i2c_match, pdev->dev.of_node);
                            ^~~~~~~~~~~~~~~~~
   drivers/i2c/busses/i2c-s3c2410.c:174:25: note: each undeclared identifier is reported only once for each function it appears in
--
   drivers/watchdog/s3c2410_wdt.c: In function 's3c2410_get_wdt_drv_data':
>> drivers/watchdog/s3c2410_wdt.c:515:25: error: 's3c2410_wdt_match' undeclared (first use in this function)
      match = of_match_node(s3c2410_wdt_match, pdev->dev.of_node);
                            ^~~~~~~~~~~~~~~~~
   drivers/watchdog/s3c2410_wdt.c:515:25: note: each undeclared identifier is reported only once for each function it appears in

vim +/s3c24xx_i2c_match +174 drivers/i2c/busses/i2c-s3c2410.c

faf93ff6 Giridhar Maruthy    2013-01-24  158  	  .data = (void *)(QUIRK_S3C2440 | QUIRK_NO_GPIO) },
117053f7 Vasanth Ananthan    2013-11-11  159  	{ .compatible = "samsung,exynos5-sata-phy-i2c",
117053f7 Vasanth Ananthan    2013-11-11  160  	  .data = (void *)(QUIRK_S3C2440 | QUIRK_POLL | QUIRK_NO_GPIO) },
27452498 Karol Lewandowski   2012-04-23  161  	{},
27452498 Karol Lewandowski   2012-04-23  162  };
27452498 Karol Lewandowski   2012-04-23  163  MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
27452498 Karol Lewandowski   2012-04-23  164  #endif
^1da177e Linus Torvalds      2005-04-16  165  
ec7c34a4 Krzysztof Kozlowski 2016-04-21  166  /*
27452498 Karol Lewandowski   2012-04-23  167   * Get controller type either from device tree or platform device variant.
^1da177e Linus Torvalds      2005-04-16  168   */
5f1b1155 Pankaj Dubey        2014-01-15  169  static inline kernel_ulong_t s3c24xx_get_device_quirks(struct platform_device *pdev)
^1da177e Linus Torvalds      2005-04-16  170  {
27452498 Karol Lewandowski   2012-04-23  171  	if (pdev->dev.of_node) {
27452498 Karol Lewandowski   2012-04-23  172  		const struct of_device_id *match;
0915833b Krzysztof Kozlowski 2016-04-21  173  
b900ba4c Karol Lewandowski   2012-05-30 @174  		match = of_match_node(s3c24xx_i2c_match, pdev->dev.of_node);
5f1b1155 Pankaj Dubey        2014-01-15  175  		return (kernel_ulong_t)match->data;
27452498 Karol Lewandowski   2012-04-23  176  	}
5a5f5080 Thomas Abraham      2011-09-13  177  
27452498 Karol Lewandowski   2012-04-23  178  	return platform_get_device_id(pdev)->driver_data;
^1da177e Linus Torvalds      2005-04-16  179  }
^1da177e Linus Torvalds      2005-04-16  180  
ec7c34a4 Krzysztof Kozlowski 2016-04-21  181  /*
ec7c34a4 Krzysztof Kozlowski 2016-04-21  182   * Complete the message and wake up the caller, using the given return code,

:::::: The code at line 174 was first introduced by commit
:::::: b900ba4c1513a8c9a2fab8dca4cc6f50b17d6861 i2c: s3c2410: Fix pointer type passed to of_match_node()

:::::: TO: Karol Lewandowski <k.lewandowsk-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
:::::: CC: Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH v2 0/3] of: Make of_match_node() an inline stub for CONFIG_OF=n

[David Miller]

From: Florian Fainelli <f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Tue, 11 Apr 2017 21:41:53 -0700

> Hi all,
> 
> This patch series makes of_match_node() an inline stub for CONFIG_OF=n. kbuild
> reported two build errors which are fixed as preriquisite patches.
> 
> This is based on Linus' master, not sure which tree would merge this, Frank's?

I think Frank's would be best.  For the series:

Acked-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
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Re: [PATCH v2 0/3] of: Make of_match_node() an inline stub for CONFIG_OF=n

[Frank Rowand]

On 04/11/17 21:41, Florian Fainelli wrote:
> Hi all,
> 
> This patch series makes of_match_node() an inline stub for CONFIG_OF=n. kbuild
> reported two build errors which are fixed as preriquisite patches.
> 
> This is based on Linus' master, not sure which tree would merge this, Frank's?

It would come in via Rob.

I am not comfortable with patch 3/3 at this moment.

Version 1 of the patch resulted in two errors from the kbuild test robot.  This
version results in another error from the kbuild test robot.  I know it is a
lot of work, but please look at all of the callers of of_match_node() and
check whether any of the other callers will have the same type of error that
the kbuild test robot is catching.

-Frank

> 
> Thanks!
> 
> Florian Fainelli (3):
>   mfd: max8998: Remove CONFIG_OF around max8998_dt_match
>   net: macb: Remove CONFIG_OF around DT match table
>   of: Make of_match_node() an inline stub for CONFIG_OF=n
> 
>  drivers/mfd/max8998.c               | 2 --
>  drivers/net/ethernet/cadence/macb.c | 2 --
>  include/linux/of.h                  | 6 +++++-
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 

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