[RESEND PATCH 2/2] arm64: make WANT_HUGE_PMD_SHARE depends on HUGETLB_PAGE
zhong jiang
zhongjiang at huawei.com
Fri Dec 16 06:08:53 PST 2016
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 at 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 at 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
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