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Subject[PATCH] hugetlb: remove unused hstate in hugetlb_fault_mutex_hash()
Date
The first parameter hstate in function hugetlb_fault_mutex_hash() is not
used anymore.

This patch removes it.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/hugetlbfs/inode.c | 4 ++--
include/linux/hugetlb.h | 4 ++--
mm/hugetlb.c | 12 ++++++------
mm/userfaultfd.c | 5 +----
4 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index a478df035651..715db1e34174 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -440,7 +440,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
u32 hash;

index = page->index;
- hash = hugetlb_fault_mutex_hash(h, mapping, index, 0);
+ hash = hugetlb_fault_mutex_hash(mapping, index, 0);
mutex_lock(&hugetlb_fault_mutex_table[hash]);

/*
@@ -644,7 +644,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
addr = index * hpage_size;

/* mutex taken here, fault path and hole punch */
- hash = hugetlb_fault_mutex_hash(h, mapping, index, addr);
+ hash = hugetlb_fault_mutex_hash(mapping, index, addr);
mutex_lock(&hugetlb_fault_mutex_table[hash]);

/* See if already present in mapping to avoid alloc/free */
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 53fc34f930d0..40e9e3fad1cf 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -105,8 +105,8 @@ void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
void free_huge_page(struct page *page);
void hugetlb_fix_reserve_counts(struct inode *inode);
extern struct mutex *hugetlb_fault_mutex_table;
-u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
- pgoff_t idx, unsigned long address);
+u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx,
+ unsigned long address);

pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ef37c85423a5..e0f033baac9d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3916,7 +3916,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
* handling userfault. Reacquire after handling
* fault to make calling code simpler.
*/
- hash = hugetlb_fault_mutex_hash(h, mapping, idx, haddr);
+ hash = hugetlb_fault_mutex_hash(mapping, idx, haddr);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
ret = handle_userfault(&vmf, VM_UFFD_MISSING);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
@@ -4043,8 +4043,8 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
}

#ifdef CONFIG_SMP
-u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
- pgoff_t idx, unsigned long address)
+u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx,
+ unsigned long address)
{
unsigned long key[2];
u32 hash;
@@ -4061,8 +4061,8 @@ u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
* For uniprocesor systems we always use a single mutex, so just
* return 0 and avoid the hashing overhead.
*/
-u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
- pgoff_t idx, unsigned long address)
+u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx,
+ unsigned long address)
{
return 0;
}
@@ -4106,7 +4106,7 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* get spurious allocation failures if two CPUs race to instantiate
* the same page in the page cache.
*/
- hash = hugetlb_fault_mutex_hash(h, mapping, idx, haddr);
+ hash = hugetlb_fault_mutex_hash(mapping, idx, haddr);
mutex_lock(&hugetlb_fault_mutex_table[hash]);

entry = huge_ptep_get(ptep);
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 0a40746a5b1e..5c0a80626cf0 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -214,7 +214,6 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
unsigned long src_addr, dst_addr;
long copied;
struct page *page;
- struct hstate *h;
unsigned long vma_hpagesize;
pgoff_t idx;
u32 hash;
@@ -271,8 +270,6 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
goto out_unlock;
}

- h = hstate_vma(dst_vma);
-
while (src_addr < src_start + len) {
pte_t dst_pteval;

@@ -283,7 +280,7 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
*/
idx = linear_page_index(dst_vma, dst_addr);
mapping = dst_vma->vm_file->f_mapping;
- hash = hugetlb_fault_mutex_hash(h, mapping, idx, dst_addr);
+ hash = hugetlb_fault_mutex_hash(mapping, idx, dst_addr);
mutex_lock(&hugetlb_fault_mutex_table[hash]);

err = -ENOMEM;
--
2.17.1
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