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mm: introduce page_size() 

Patch series "Make working with compound pages easier", v2.

These three patches add three helpers and convert the appropriate
places to use them.

This patch (of 3):

It's unnecessarily hard to find out the size of a potentially huge page.
Replace 'PAGE_SIZE << compound_order(page)' with page_size(page).

Link: http://lkml.kernel.org/r/20190721104612.19120-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
alistair/sunxi64-5.4-dsi
Matthew Wilcox (Oracle) 2019-09-23 15:34:25 -07:00 committed by Linus Torvalds
parent 1f18b29669
commit a50b854e07
17 changed files with 35 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/mm/flush.c
View File

@ -204,8 +204,7 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page)
* coherent with the kernels mapping.
*/
if (!PageHighMem(page)) {
size_t page_size = PAGE_SIZE << compound_order(page);
__cpuc_flush_dcache_area(page_address(page), page_size);
__cpuc_flush_dcache_area(page_address(page), page_size(page));
} else {
unsigned long i;
if (cache_is_vipt_nonaliasing()) {

3
arch/arm64/mm/flush.c
View File

@ -56,8 +56,7 @@ void __sync_icache_dcache(pte_t pte)
struct page *page = pte_page(pte);
if (!test_and_set_bit(PG_dcache_clean, &page->flags))
sync_icache_aliases(page_address(page),
PAGE_SIZE << compound_order(page));
sync_icache_aliases(page_address(page), page_size(page));
}
EXPORT_SYMBOL_GPL(__sync_icache_dcache);

2
arch/ia64/mm/init.c
View File

@ -64,7 +64,7 @@ __ia64_sync_icache_dcache (pte_t pte)
if (test_bit(PG_arch_1, &page->flags))
return; /* i-cache is already coherent with d-cache */
flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page)));
flush_icache_range(addr, addr + page_size(page));
set_bit(PG_arch_1, &page->flags); /* mark page as clean */
}

5
drivers/crypto/chelsio/chtls/chtls_io.c
View File

@ -1078,7 +1078,7 @@ new_buf:
bool merge;
if (page)
pg_size <<= compound_order(page);
pg_size = page_size(page);
if (off < pg_size &&
skb_can_coalesce(skb, i, page, off)) {
merge = 1;
@ -1105,8 +1105,7 @@ new_buf:
__GFP_NORETRY,
order);
if (page)
pg_size <<=
compound_order(page);
pg_size <<= order;
}
if (!page) {
page = alloc_page(gfp);

4
drivers/staging/android/ion/ion_system_heap.c
View File

@ -120,7 +120,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
if (!page)
goto free_pages;
list_add_tail(&page->lru, &pages);
size_remaining -= PAGE_SIZE << compound_order(page);
size_remaining -= page_size(page);
max_order = compound_order(page);
i++;
}
@ -133,7 +133,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
sg = table->sgl;
list_for_each_entry_safe(page, tmp_page, &pages, lru) {
sg_set_page(sg, page, PAGE_SIZE << compound_order(page), 0);
sg_set_page(sg, page, page_size(page), 0);
sg = sg_next(sg);
list_del(&page->lru);
}

3
drivers/target/tcm_fc/tfc_io.c
View File

@ -136,8 +136,7 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
page, off_in_page, tlen);
fr_len(fp) += tlen;
fp_skb(fp)->data_len += tlen;
fp_skb(fp)->truesize +=
PAGE_SIZE << compound_order(page);
fp_skb(fp)->truesize += page_size(page);
} else {
BUG_ON(!page);
from = kmap_atomic(page + (mem_off >> PAGE_SHIFT));

2
fs/io_uring.c
View File

@ -3319,7 +3319,7 @@ static int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
}
page = virt_to_head_page(ptr);
if (sz > (PAGE_SIZE << compound_order(page)))
if (sz > page_size(page))
return -EINVAL;
pfn = virt_to_phys(ptr) >> PAGE_SHIFT;

2
include/linux/hugetlb.h
View File

@ -454,7 +454,7 @@ static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
static inline struct hstate *page_hstate(struct page *page)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
return size_to_hstate(PAGE_SIZE << compound_order(page));
return size_to_hstate(page_size(page));
}
static inline unsigned hstate_index_to_shift(unsigned index)

6
include/linux/mm.h
View File

@ -805,6 +805,12 @@ static inline void set_compound_order(struct page *page, unsigned int order)
page[1].compound_order = order;
}
/* Returns the number of bytes in this potentially compound page. */
static inline unsigned long page_size(struct page *page)
{
return PAGE_SIZE << compound_order(page);
}
void free_compound_page(struct page *page);
#ifdef CONFIG_MMU

2
lib/iov_iter.c
View File

@ -878,7 +878,7 @@ static inline bool page_copy_sane(struct page *page, size_t offset, size_t n)
head = compound_head(page);
v += (page - head) << PAGE_SHIFT;
if (likely(n <= v && v <= (PAGE_SIZE << compound_order(head))))
if (likely(n <= v && v <= (page_size(head))))
return true;
WARN_ON(1);
return false;

8
mm/kasan/common.c
View File

@ -338,8 +338,7 @@ void kasan_poison_slab(struct page *page)
for (i = 0; i < (1 << compound_order(page)); i++)
page_kasan_tag_reset(page + i);
kasan_poison_shadow(page_address(page),
PAGE_SIZE << compound_order(page),
kasan_poison_shadow(page_address(page), page_size(page),
KASAN_KMALLOC_REDZONE);
}
@ -542,7 +541,7 @@ void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
page = virt_to_page(ptr);
redzone_start = round_up((unsigned long)(ptr + size),
KASAN_SHADOW_SCALE_SIZE);
redzone_end = (unsigned long)ptr + (PAGE_SIZE << compound_order(page));
redzone_end = (unsigned long)ptr + page_size(page);
kasan_unpoison_shadow(ptr, size);
kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start,
@ -578,8 +577,7 @@ void kasan_poison_kfree(void *ptr, unsigned long ip)
kasan_report_invalid_free(ptr, ip);
return;
}
kasan_poison_shadow(ptr, PAGE_SIZE << compound_order(page),
KASAN_FREE_PAGE);
kasan_poison_shadow(ptr, page_size(page), KASAN_FREE_PAGE);
} else {
__kasan_slab_free(page->slab_cache, ptr, ip, false);
}

2
mm/nommu.c
View File

@ -108,7 +108,7 @@ unsigned int kobjsize(const void *objp)
* The ksize() function is only guaranteed to work for pointers
* returned by kmalloc(). So handle arbitrary pointers here.
*/
return PAGE_SIZE << compound_order(page);
return page_size(page);
}
/**

3
mm/page_vma_mapped.c
View File

@ -153,8 +153,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
if (unlikely(PageHuge(pvmw->page))) {
/* when pud is not present, pte will be NULL */
pvmw->pte = huge_pte_offset(mm, pvmw->address,
PAGE_SIZE << compound_order(page));
pvmw->pte = huge_pte_offset(mm, pvmw->address, page_size(page));
if (!pvmw->pte)
return false;

6
mm/rmap.c
View File

@ -898,8 +898,7 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
*/
mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE,
0, vma, vma->vm_mm, address,
min(vma->vm_end, address +
(PAGE_SIZE << compound_order(page))));
min(vma->vm_end, address + page_size(page)));
mmu_notifier_invalidate_range_start(&range);
while (page_vma_mapped_walk(&pvmw)) {
@ -1372,8 +1371,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
*/
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
address,
min(vma->vm_end, address +
(PAGE_SIZE << compound_order(page))));
min(vma->vm_end, address + page_size(page)));
if (PageHuge(page)) {
/*
* If sharing is possible, start and end will be adjusted

2
mm/slob.c
View File

@ -539,7 +539,7 @@ size_t __ksize(const void *block)
sp = virt_to_page(block);
if (unlikely(!PageSlab(sp)))
return PAGE_SIZE << compound_order(sp);
return page_size(sp);
align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
m = (unsigned int *)(block - align);

18
mm/slub.c
View File

@ -829,7 +829,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
return 1;
start = page_address(page);
length = PAGE_SIZE << compound_order(page);
length = page_size(page);
end = start + length;
remainder = length % s->size;
if (!remainder)
@ -1074,13 +1074,14 @@ static void setup_object_debug(struct kmem_cache *s, struct page *page,
init_tracking(s, object);
}
static void setup_page_debug(struct kmem_cache *s, void *addr, int order)
static
void setup_page_debug(struct kmem_cache *s, struct page *page, void *addr)
{
if (!(s->flags & SLAB_POISON))
return;
metadata_access_enable();
memset(addr, POISON_INUSE, PAGE_SIZE << order);
memset(addr, POISON_INUSE, page_size(page));
metadata_access_disable();
}
@ -1340,8 +1341,8 @@ slab_flags_t kmem_cache_flags(unsigned int object_size,
#else /* !CONFIG_SLUB_DEBUG */
static inline void setup_object_debug(struct kmem_cache *s,
struct page *page, void *object) {}
static inline void setup_page_debug(struct kmem_cache *s,
void *addr, int order) {}
static inline
void setup_page_debug(struct kmem_cache *s, struct page *page, void *addr) {}
static inline int alloc_debug_processing(struct kmem_cache *s,
struct page *page, void *object, unsigned long addr) { return 0; }
@ -1639,7 +1640,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
struct kmem_cache_order_objects oo = s->oo;
gfp_t alloc_gfp;
void *start, *p, *next;
int idx, order;
int idx;
bool shuffle;
flags &= gfp_allowed_mask;
@ -1673,7 +1674,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
page->objects = oo_objects(oo);
order = compound_order(page);
page->slab_cache = s;
__SetPageSlab(page);
if (page_is_pfmemalloc(page))
@ -1683,7 +1683,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
start = page_address(page);
setup_page_debug(s, start, order);
setup_page_debug(s, page, start);
shuffle = shuffle_freelist(s, page);
@ -3932,7 +3932,7 @@ size_t __ksize(const void *object)
if (unlikely(!PageSlab(page))) {
WARN_ON(!PageCompound(page));
return PAGE_SIZE << compound_order(page);
return page_size(page);
}
return slab_ksize(page->slab_cache);

2
net/xdp/xsk.c
View File

@ -977,7 +977,7 @@ static int xsk_mmap(struct file *file, struct socket *sock,
/* Matches the smp_wmb() in xsk_init_queue */
smp_rmb();
qpg = virt_to_head_page(q->ring);
if (size > (PAGE_SIZE << compound_order(qpg)))
if (size > page_size(qpg))
return -EINVAL;
pfn = virt_to_phys(q->ring) >> PAGE_SHIFT;