diff mbox

[RESEND,2/2] arm64: make WANT_HUGE_PMD_SHARE depends on HUGETLB_PAGE

Message ID 1481725151-20549-3-git-send-email-zhongjiang@huawei.com (mailing list archive)
State New, archived
Headers show

Commit Message

zhong jiang Dec. 14, 2016, 2:19 p.m. UTC 
From: zhong jiang <zhongjiang@huawei.com>

when HUGETLB_PAGE is disable, WANT_HUGE_PMD_SHARE contains the
fuctions should not be use. therefore, we add the dependency.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

Comments

zhong jiang Dec. 16, 2016, 9:10 a.m. UTC | #1 
On 2016/12/14 22:19, zhongjiang wrote:
> From: zhong jiang <zhongjiang@huawei.com>
>
> when HUGETLB_PAGE is disable, WANT_HUGE_PMD_SHARE contains the
> fuctions should not be use. therefore, we add the dependency.
>
> Signed-off-by: zhong jiang <zhongjiang@huawei.com>
> ---
>  arch/arm64/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 969ef88..694ca73 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -640,6 +640,7 @@ config SYS_SUPPORTS_HUGETLBFS
>  
>  config ARCH_WANT_HUGE_PMD_SHARE
>  	def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
> +	depends on HUGETLB_PAGE
>  
>  config ARCH_HAS_CACHE_LINE_SIZE
>  	def_bool y
Hi,
      I still think it is a issue. Perhaps above changelog is unclear.  Further explain is as follows.
 when hugetlb_pages is disable and arch_want_huge_pmd_share is enable,   we maybe call
 huge_pmd_sahre in hugetlbpage.c, but the function actually is not definition as it is not
 exported.  is it right ??

Thanks
zhongjiang
Will Deacon Dec. 16, 2016, 12:35 p.m. UTC | #2 
On Fri, Dec 16, 2016 at 05:10:05PM +0800, zhong jiang wrote:
> On 2016/12/14 22:19, zhongjiang wrote:
> > From: zhong jiang <zhongjiang@huawei.com>
> >
> > when HUGETLB_PAGE is disable, WANT_HUGE_PMD_SHARE contains the
> > fuctions should not be use. therefore, we add the dependency.
> >
> > Signed-off-by: zhong jiang <zhongjiang@huawei.com>
> > ---
> >  arch/arm64/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index 969ef88..694ca73 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -640,6 +640,7 @@ config SYS_SUPPORTS_HUGETLBFS
> >  
> >  config ARCH_WANT_HUGE_PMD_SHARE
> >  	def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
> > +	depends on HUGETLB_PAGE
> >  
> >  config ARCH_HAS_CACHE_LINE_SIZE
> >  	def_bool y
> Hi,
>       I still think it is a issue. Perhaps above changelog is unclear.  Further explain is as follows.
>  when hugetlb_pages is disable and arch_want_huge_pmd_share is enable,   we maybe call
>  huge_pmd_sahre in hugetlbpage.c, but the function actually is not definition as it is not
>  exported.  is it right ??

The only users of ARCH_WANT_HUGE_PMD_SHARE on arm64 are:

arch/arm64/mm/hugetlbpage.c:            if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
mm/hugetlb.c:#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
mm/hugetlb.c:#else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
mm/hugetlb.c:#endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */

and neither of those files are compiled if !HUGETLB_PAGE.

Are you actually seeing a problem here?

Will
zhong jiang Dec. 16, 2016, 12:56 p.m. UTC | #3 
On 2016/12/16 20:35, Will Deacon wrote:
> On Fri, Dec 16, 2016 at 05:10:05PM +0800, zhong jiang wrote:
>> On 2016/12/14 22:19, zhongjiang wrote:
>>> From: zhong jiang <zhongjiang@huawei.com>
>>>
>>> when HUGETLB_PAGE is disable, WANT_HUGE_PMD_SHARE contains the
>>> fuctions should not be use. therefore, we add the dependency.
>>>
>>> Signed-off-by: zhong jiang <zhongjiang@huawei.com>
>>> ---
>>>  arch/arm64/Kconfig | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>>> index 969ef88..694ca73 100644
>>> --- a/arch/arm64/Kconfig
>>> +++ b/arch/arm64/Kconfig
>>> @@ -640,6 +640,7 @@ config SYS_SUPPORTS_HUGETLBFS
>>>  
>>>  config ARCH_WANT_HUGE_PMD_SHARE
>>>  	def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
>>> +	depends on HUGETLB_PAGE
>>>  
>>>  config ARCH_HAS_CACHE_LINE_SIZE
>>>  	def_bool y
>> Hi,
>>       I still think it is a issue. Perhaps above changelog is unclear.  Further explain is as follows.
>>  when hugetlb_pages is disable and arch_want_huge_pmd_share is enable,   we maybe call
>>  huge_pmd_sahre in hugetlbpage.c, but the function actually is not definition as it is not
>>  exported.  is it right ??
> The only users of ARCH_WANT_HUGE_PMD_SHARE on arm64 are:
>
> arch/arm64/mm/hugetlbpage.c:            if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
  yes
> mm/hugetlb.c:#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
> mm/hugetlb.c:#else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
> mm/hugetlb.c:#endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
>
> and neither of those files are compiled if !HUGETLB_PAGE.
  Indeed, but  The only users maybe use it  if !HUGETLB_PAGE. 
  because  include/linux/hugetlb.h  can not export the reference if !HUGETLB_PAGE.
  IOW,  the function is not definition.  

  is it right ? or I miss the key point.
> Are you actually seeing a problem here?
  I review the code and find the issue.

 Thanks
 zhongjiang
> Will
>
> .
>
zhong jiang Dec. 16, 2016, 2:08 p.m. UTC | #4 
On 2016/12/16 20:35, Will Deacon wrote:
> On Fri, Dec 16, 2016 at 05:10:05PM +0800, zhong jiang wrote:
>> On 2016/12/14 22:19, zhongjiang wrote:
>>> From: zhong jiang <zhongjiang@huawei.com>
>>>
>>> when HUGETLB_PAGE is disable, WANT_HUGE_PMD_SHARE contains the
>>> fuctions should not be use. therefore, we add the dependency.
>>>
>>> Signed-off-by: zhong jiang <zhongjiang@huawei.com>
>>> ---
>>>  arch/arm64/Kconfig | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>>> index 969ef88..694ca73 100644
>>> --- a/arch/arm64/Kconfig
>>> +++ b/arch/arm64/Kconfig
>>> @@ -640,6 +640,7 @@ config SYS_SUPPORTS_HUGETLBFS
>>>  
>>>  config ARCH_WANT_HUGE_PMD_SHARE
>>>  	def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
>>> +	depends on HUGETLB_PAGE
>>>  
>>>  config ARCH_HAS_CACHE_LINE_SIZE
>>>  	def_bool y
>> Hi,
>>       I still think it is a issue. Perhaps above changelog is unclear.  Further explain is as follows.
>>  when hugetlb_pages is disable and arch_want_huge_pmd_share is enable,   we maybe call
>>  huge_pmd_sahre in hugetlbpage.c, but the function actually is not definition as it is not
>>  exported.  is it right ??
> The only users of ARCH_WANT_HUGE_PMD_SHARE on arm64 are:
>
> arch/arm64/mm/hugetlbpage.c:            if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
> mm/hugetlb.c:#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
> mm/hugetlb.c:#else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
> mm/hugetlb.c:#endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
>
> and neither of those files are compiled if !HUGETLB_PAGE.
>
> Are you actually seeing a problem here?
>
> Will
>
> .
>
  I got it.  Please forget the  stupid patch and my stupid comments.
 
 but the first patch look reasonable.  Is it accepted  ?

 Thanks
 zhongjiang
diff mbox

Patch

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 969ef88..694ca73 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -640,6 +640,7 @@  config SYS_SUPPORTS_HUGETLBFS
 
 config ARCH_WANT_HUGE_PMD_SHARE
 	def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
+	depends on HUGETLB_PAGE
 
 config ARCH_HAS_CACHE_LINE_SIZE
 	def_bool y