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hugetlbfs: hugetlb_fault_mutex_hash() cleanup

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commit 552546366a upstream.

A new clang diagnostic (-Wsizeof-array-div) warns about the calculation
to determine the number of u32's in an array of unsigned longs.
Suppress warning by adding parentheses.

While looking at the above issue, noticed that the 'address' parameter
to hugetlb_fault_mutex_hash is no longer used.  So, remove it from the
definition and all callers.

No functional change.

Link: http://lkml.kernel.org/r/20190919011847.18400-1-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Ilie Halip <ilie.halip@gmail.com>
Cc: David Bolvansky <david.bolvansky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Kravetz 2019-11-30 17:56:30 -08:00 committed by Greg Kroah-Hartman
parent 84a9886356
commit a92212ef63
4 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/hugetlbfs/inode.c
View File

@ -426,7 +426,7 @@ 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(h, mapping, index);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
/*
@ -623,7 +623,7 @@ 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(h, mapping, index);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
/* See if already present in mapping to avoid alloc/free */

2
include/linux/hugetlb.h
View File

@ -124,7 +124,7 @@ 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);
pgoff_t idx);
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);

10
mm/hugetlb.c
View File

@ -3862,7 +3862,7 @@ retry:
* 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(h, mapping, idx);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
ret = handle_userfault(&vmf, VM_UFFD_MISSING);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
@ -3971,7 +3971,7 @@ backout_unlocked:
#ifdef CONFIG_SMP
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
pgoff_t idx, unsigned long address)
pgoff_t idx)
{
unsigned long key[2];
u32 hash;
@ -3979,7 +3979,7 @@ u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
key[0] = (unsigned long) mapping;
key[1] = idx;
hash = jhash2((u32 *)&key, sizeof(key)/sizeof(u32), 0);
hash = jhash2((u32 *)&key, sizeof(key)/(sizeof(u32)), 0);
return hash & (num_fault_mutexes - 1);
}
@ -3989,7 +3989,7 @@ u32 hugetlb_fault_mutex_hash(struct hstate *h, struct address_space *mapping,
* 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)
pgoff_t idx)
{
return 0;
}
@ -4033,7 +4033,7 @@ 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(h, mapping, idx);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
entry = huge_ptep_get(ptep);

2
mm/userfaultfd.c
View File

@ -271,7 +271,7 @@ retry:
*/
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(h, mapping, idx);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
err = -ENOMEM;