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authorDan Williams <dan.j.williams@intel.com>2017-07-10 15:48:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-10 16:32:31 -0700
commit16981d763501c0e06e434cf6b59f964c520e0ccc (patch)
tree7a286e047280971e4eabb5812d5beca9da7d3f98 /include/linux/huge_mm.h
parent7ab0e50ad0831e714dcdc3de44a7fe3887732b7c (diff)
mm: improve readability of transparent_hugepage_enabled()
Turn the macro into a static inline and rewrite the condition checks for better readability in preparation for adding another condition. [ross.zwisler@linux.intel.com: fix logic to make conversion equivalent] [akpm@linux-foundation.org: resolve vs mm-make-pr_set_thp_disable-immediately-active.patch] [akpm@linux-foundation.org: include coredump.h for MMF_DISABLE_THP] Link: http://lkml.kernel.org/r/149739530612.20686.14760671150202647861.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Acked-by: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/huge_mm.h')
-rw-r--r--include/linux/huge_mm.h41
1 files changed, 29 insertions, 12 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 40d7b7dd2653..f4239d3c9c73 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -1,6 +1,8 @@
#ifndef _LINUX_HUGE_MM_H
#define _LINUX_HUGE_MM_H
+#include <linux/sched/coredump.h>
+
extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
@@ -85,15 +87,29 @@ extern struct kobj_attribute shmem_enabled_attr;
extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
-#define transparent_hugepage_enabled(__vma) \
- ((transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
- (transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
- ((__vma)->vm_flags & VM_HUGEPAGE))) && \
- !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
- !test_bit(MMF_DISABLE_THP, &(__vma)->vm_mm->flags) && \
- !is_vma_temporary_stack(__vma))
+extern unsigned long transparent_hugepage_flags;
+
+static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_NOHUGEPAGE)
+ return false;
+
+ if (is_vma_temporary_stack(vma))
+ return false;
+
+ if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
+ return false;
+
+ if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
+ return true;
+
+ if (transparent_hugepage_flags &
+ (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
+ return !!(vma->vm_flags & VM_HUGEPAGE);
+
+ return false;
+}
+
#define transparent_hugepage_use_zero_page() \
(transparent_hugepage_flags & \
(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
@@ -105,8 +121,6 @@ extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
#define transparent_hugepage_debug_cow() 0
#endif /* CONFIG_DEBUG_VM */
-extern unsigned long transparent_hugepage_flags;
-
extern unsigned long thp_get_unmapped_area(struct file *filp,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags);
@@ -225,7 +239,10 @@ void mm_put_huge_zero_page(struct mm_struct *mm);
#define hpage_nr_pages(x) 1
-#define transparent_hugepage_enabled(__vma) 0
+static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
+{
+ return false;
+}
static inline void prep_transhuge_page(struct page *page) {}