[PATCH] mm/hugetlb: remove unused argument of follow_huge_(pmd|pud)

From: Naoya Horiguchi
Date: Mon Aug 04 2014 - 11:50:24 EST

On Fri, Aug 01, 2014 at 05:58:45PM -0400, Naoya Horiguchi wrote:
...
> > I can't find an implementation of follow_huge_pmd() which actually uses
> > the fourth argument "write". Zap?
>
> OK, I'll post it later.

Here is the patch.

Thanks,
Naoya Horiguchi
---
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Date: Mon, 4 Aug 2014 11:30:00 -0400
Subject: [PATCH] mm/hugetlb: remove unused argument of follow_huge_(pmd|pud)

There is no implementation of follow_huge_pmd() which actually uses
the fourth argument "write". So let's zap it.

Suggested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
arch/ia64/mm/hugetlbpage.c | 2 +-
arch/metag/mm/hugetlbpage.c | 2 +-
arch/mips/mm/hugetlbpage.c | 2 +-
arch/powerpc/mm/hugetlbpage.c | 2 +-
arch/s390/mm/hugetlbpage.c | 2 +-
arch/sh/mm/hugetlbpage.c | 2 +-
arch/sparc/mm/hugetlbpage.c | 2 +-
arch/tile/mm/hugetlbpage.c | 4 ++--
arch/x86/mm/hugetlbpage.c | 2 +-
include/linux/hugetlb.h | 8 ++++----
mm/gup.c | 2 +-
mm/hugetlb.c | 11 ++++-------
12 files changed, 19 insertions(+), 22 deletions(-)

diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index 76069c18ee42..d14ae6804106 100644
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -115,7 +115,7 @@ int pud_huge(pud_t pud)
}

struct page *
-follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write)
+follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd)
{
return NULL;
}
diff --git a/arch/metag/mm/hugetlbpage.c b/arch/metag/mm/hugetlbpage.c
index 3c52fa6d0f8e..e2559b12f6aa 100644
--- a/arch/metag/mm/hugetlbpage.c
+++ b/arch/metag/mm/hugetlbpage.c
@@ -111,7 +111,7 @@ int pud_huge(pud_t pud)
}

struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
return NULL;
}
diff --git a/arch/mips/mm/hugetlbpage.c b/arch/mips/mm/hugetlbpage.c
index 4ec8ee10d371..690749184d0f 100644
--- a/arch/mips/mm/hugetlbpage.c
+++ b/arch/mips/mm/hugetlbpage.c
@@ -86,7 +86,7 @@ int pud_huge(pud_t pud)

struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
struct page *page;

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 7e70ae968e5f..8339978033ad 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -700,7 +700,7 @@ follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)

struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
BUG();
return NULL;
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 0ff66a7e29bb..abbdee629790 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -221,7 +221,7 @@ int pud_huge(pud_t pud)
}

struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmdp, int write)
+ pmd_t *pmdp)
{
struct page *page;

diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index d7762349ea48..1f636ed3ffcd 100644
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -84,7 +84,7 @@ int pud_huge(pud_t pud)
}

struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
return NULL;
}
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index d329537739c6..4cb2b4820bd5 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -232,7 +232,7 @@ int pud_huge(pud_t pud)
}

struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
return NULL;
}
diff --git a/arch/tile/mm/hugetlbpage.c b/arch/tile/mm/hugetlbpage.c
index e514899e1100..3c07a555b9b9 100644
--- a/arch/tile/mm/hugetlbpage.c
+++ b/arch/tile/mm/hugetlbpage.c
@@ -167,7 +167,7 @@ int pud_huge(pud_t pud)
}

struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
struct page *page;

@@ -178,7 +178,7 @@ struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
}

struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
- pud_t *pud, int write)
+ pud_t *pud)
{
struct page *page;

diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 8b977ebf9388..fc72bb59141c 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -54,7 +54,7 @@ int pud_huge(pud_t pud)

struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+ pmd_t *pmd)
{
return NULL;
}
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 194834853d6f..3a8b338ff84a 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -98,9 +98,9 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write);
+ pmd_t *pmd);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
- pud_t *pud, int write);
+ pud_t *pud);
struct page *follow_huge_pmd_lock(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmd, int flags);
int pmd_huge(pmd_t pmd);
@@ -134,8 +134,8 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
static inline void hugetlb_show_meminfo(void)
{
}
-#define follow_huge_pmd(mm, addr, pmd, write) NULL
-#define follow_huge_pud(mm, addr, pud, write) NULL
+#define follow_huge_pmd(mm, addr, pmd) NULL
+#define follow_huge_pud(mm, addr, pud) NULL
#define follow_huge_pmd_lock(vma, addr, pmd, flags) NULL
#define prepare_hugepage_range(file, addr, len) (-EINVAL)
#define pmd_huge(x) 0
diff --git a/mm/gup.c b/mm/gup.c
index e4bd59efe686..57e394e33e66 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -165,7 +165,7 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
if (pud_huge(*pud) && vma->vm_flags & VM_HUGETLB) {
if (flags & FOLL_GET)
return NULL;
- page = follow_huge_pud(mm, address, pud, flags & FOLL_WRITE);
+ page = follow_huge_pud(mm, address, pud);
return page;
}
if (unlikely(pud_bad(*pud)))
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 923465c0b47f..4f6d1a4f5339 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3657,8 +3657,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
}

struct page *
-follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
+follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd)
{
struct page *page;

@@ -3669,8 +3668,7 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
}

struct page *
-follow_huge_pud(struct mm_struct *mm, unsigned long address,
- pud_t *pud, int write)
+follow_huge_pud(struct mm_struct *mm, unsigned long address, pud_t *pud)
{
struct page *page;

@@ -3684,8 +3682,7 @@ follow_huge_pud(struct mm_struct *mm, unsigned long address,

/* Can be overriden by architectures */
struct page * __weak
-follow_huge_pud(struct mm_struct *mm, unsigned long address,
- pud_t *pud, int write)
+follow_huge_pud(struct mm_struct *mm, unsigned long address, pud_t *pud)
{
BUG();
return NULL;
@@ -3710,7 +3707,7 @@ struct page *follow_huge_pmd_lock(struct vm_area_struct *vma,
if (flags & FOLL_GET)
ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, (pte_t *)pmd);

- page = follow_huge_pmd(vma->vm_mm, address, pmd, flags & FOLL_WRITE);
+ page = follow_huge_pmd(vma->vm_mm, address, pmd);

if (flags & FOLL_GET) {
/*
--
1.9.3

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