Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1662260 > unrolled thread

[PATCH] mm: hugetlb: replace some macros with inline functions

Back to article view | Back to linux.kernel

Contents

  [PATCH] mm: hugetlb: replace some macros with inline functions Arnd Bergmann <arnd@arndb.de> - 2017-06-09 12:30 +0200
    Re: [PATCH] mm: hugetlb: replace some macros with inline functions Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-06-12 02:00 +0200

#1662260 — [PATCH] mm: hugetlb: replace some macros with inline functions

All users of dissolve_free_huge_page() that ignore the result cause a warning
when CONFIG_HUGETLB_PAGE is disabled:

mm/memory-failure.c: In function 'me_huge_page':
include/linux/hugetlb.h:556:36: error: statement with no effect [-Werror=unused-value]
 #define dissolve_free_huge_page(p) 0

We can avoid this by using an inline function instead of the macro, and I
decided to do the same change for the related helpers as well.

Fixes: mmotm ("mm: hugetlb: soft-offline: dissolve source hugepage after successful migration")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 include/linux/hugetlb.h | 31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index dbb118c566cd..57f700ac127e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -546,16 +546,37 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
 {
 	return 1;
 }
-#define hstate_index_to_shift(index) 0
-#define hstate_index(h) 0
+
+static inline unsigned hstate_index_to_shift(unsigned index)
+{
+	return 0;
+}
+
+static inline int hstate_index(struct hstate *h)
+{
+	return 0;
+}
 
 static inline pgoff_t basepage_index(struct page *page)
 {
 	return page->index;
 }
-#define dissolve_free_huge_page(p)	0
-#define dissolve_free_huge_pages(s, e)	0
-#define hugepage_migration_supported(h)	false
+
+static inline int dissolve_free_huge_page(struct page *page)
+{
+	return 0;
+}
+
+static inline int dissolve_free_huge_pages(unsigned long start_pfn,
+					   unsigned long end_pfn)
+{
+	return 0;
+}
+
+static inline bool hugepage_migration_supported(struct hstate *h)
+{
+	return false;
+}
 
 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 					   struct mm_struct *mm, pte_t *pte)
-- 
2.9.0

[toc] | [next] | [standalone]

#1663166

On Fri, Jun 09, 2017 at 12:25:05PM +0200, Arnd Bergmann wrote:
> All users of dissolve_free_huge_page() that ignore the result cause a warning
> when CONFIG_HUGETLB_PAGE is disabled:
> 
> mm/memory-failure.c: In function 'me_huge_page':
> include/linux/hugetlb.h:556:36: error: statement with no effect [-Werror=unused-value]
>  #define dissolve_free_huge_page(p) 0
> 
> We can avoid this by using an inline function instead of the macro, and I
> decided to do the same change for the related helpers as well.
> 
> Fixes: mmotm ("mm: hugetlb: soft-offline: dissolve source hugepage after successful migration")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Right, thank you for catching this.

Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>

> ---
>  include/linux/hugetlb.h | 31 ++++++++++++++++++++++++++-----
>  1 file changed, 26 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index dbb118c566cd..57f700ac127e 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -546,16 +546,37 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
>  {
>  	return 1;
>  }
> -#define hstate_index_to_shift(index) 0
> -#define hstate_index(h) 0
> +
> +static inline unsigned hstate_index_to_shift(unsigned index)
> +{
> +	return 0;
> +}
> +
> +static inline int hstate_index(struct hstate *h)
> +{
> +	return 0;
> +}
>  
>  static inline pgoff_t basepage_index(struct page *page)
>  {
>  	return page->index;
>  }
> -#define dissolve_free_huge_page(p)	0
> -#define dissolve_free_huge_pages(s, e)	0
> -#define hugepage_migration_supported(h)	false
> +
> +static inline int dissolve_free_huge_page(struct page *page)
> +{
> +	return 0;
> +}
> +
> +static inline int dissolve_free_huge_pages(unsigned long start_pfn,
> +					   unsigned long end_pfn)
> +{
> +	return 0;
> +}
> +
> +static inline bool hugepage_migration_supported(struct hstate *h)
> +{
> +	return false;
> +}
>  
>  static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
>  					   struct mm_struct *mm, pte_t *pte)
> -- 
> 2.9.0
> 
> 

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web