Commit 4958e4d8 authored by Yang Shi's avatar Yang Shi Committed by Linus Torvalds
Browse files

mm: thp: remove debug_cow switch 



Since commit 3917c802 ("thp: change CoW semantics for
anon-THP"), the CoW page fault of THP has been rewritten, debug_cow is not
used anymore.  So, just remove it.

Signed-off-by: default avatarYang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: http://lkml.kernel.org/r/1592270980-116062-1-git-send-email-yang.shi@linux.alibaba.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b0fc0f3f

include/linux/huge_mm.h

+0 −7
Original line number Diff line number Diff line
@@ -181,13 +181,6 @@ static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, 
#define transparent_hugepage_use_zero_page()				\

	(transparent_hugepage_flags &					\

	 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))

#ifdef CONFIG_DEBUG_VM

#define transparent_hugepage_debug_cow()				\

	(transparent_hugepage_flags &					\

	 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))

#else /* CONFIG_DEBUG_VM */

#define transparent_hugepage_debug_cow() 0

#endif /* CONFIG_DEBUG_VM */



extern unsigned long thp_get_unmapped_area(struct file *filp,

		unsigned long addr, unsigned long len, unsigned long pgoff,

mm/huge_memory.c

+0 −21
Original line number Diff line number Diff line
@@ -303,24 +303,6 @@ static ssize_t hpage_pmd_size_show(struct kobject *kobj, 
static struct kobj_attribute hpage_pmd_size_attr =

	__ATTR_RO(hpage_pmd_size);



#ifdef CONFIG_DEBUG_VM

static ssize_t debug_cow_show(struct kobject *kobj,

				struct kobj_attribute *attr, char *buf)

{

	return single_hugepage_flag_show(kobj, attr, buf,

				TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG);

}

static ssize_t debug_cow_store(struct kobject *kobj,

			       struct kobj_attribute *attr,

			       const char *buf, size_t count)

{

	return single_hugepage_flag_store(kobj, attr, buf, count,

				 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG);

}

static struct kobj_attribute debug_cow_attr =

	__ATTR(debug_cow, 0644, debug_cow_show, debug_cow_store);

#endif /* CONFIG_DEBUG_VM */



static struct attribute *hugepage_attr[] = {

	&enabled_attr.attr,

	&defrag_attr.attr,
@@ -328,9 +310,6 @@ static struct attribute *hugepage_attr[] = { 
	&hpage_pmd_size_attr.attr,

#ifdef CONFIG_SHMEM

	&shmem_enabled_attr.attr,

#endif

#ifdef CONFIG_DEBUG_VM

	&debug_cow_attr.attr,

#endif

	NULL,

};