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mm, vmalloc: use __GFP_HIGHMEM implicitly

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__vmalloc* allows users to provide gfp flags for the underlying
allocation.  This API is quite popular

  $ git grep "=[[:space:]]__vmalloc\|return[[:space:]]*__vmalloc" | wc -l
  77

The only problem is that many people are not aware that they really want
to give __GFP_HIGHMEM along with other flags because there is really no
reason to consume precious lowmemory on CONFIG_HIGHMEM systems for pages
which are mapped to the kernel vmalloc space.  About half of users don't
use this flag, though.  This signals that we make the API unnecessarily
too complex.

This patch simply uses __GFP_HIGHMEM implicitly when allocating pages to
be mapped to the vmalloc space.  Current users which add __GFP_HIGHMEM
are simplified and drop the flag.

Link: http://lkml.kernel.org/r/20170307141020.29107-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Cristopher Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2017-05-08 15:57:44 -07:00 committed by Linus Torvalds
parent 54f180d3c1
commit 19809c2da2
20 changed files with 31 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/parisc/kernel/module.c
View File

@ -218,7 +218,7 @@ void *module_alloc(unsigned long size)
* easier than trying to map the text, data, init_text and
* init_data correctly */
return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
GFP_KERNEL | __GFP_HIGHMEM,
GFP_KERNEL,
PAGE_KERNEL_RWX, 0, NUMA_NO_NODE,
__builtin_return_address(0));
}

2
arch/x86/kernel/module.c
View File

@ -85,7 +85,7 @@ void *module_alloc(unsigned long size)
p = __vmalloc_node_range(size, MODULE_ALIGN,
MODULES_VADDR + get_module_load_offset(),
MODULES_END, GFP_KERNEL | __GFP_HIGHMEM,
MODULES_END, GFP_KERNEL,
PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
__builtin_return_address(0));
if (p && (kasan_module_alloc(p, size) < 0)) {

2
drivers/block/drbd/drbd_bitmap.c
View File

@ -409,7 +409,7 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
new_pages = kzalloc(bytes, GFP_NOIO | __GFP_NOWARN);
if (!new_pages) {
new_pages = __vmalloc(bytes,
GFP_NOIO | __GFP_HIGHMEM | __GFP_ZERO,
GFP_NOIO | __GFP_ZERO,
PAGE_KERNEL);
if (!new_pages)
return NULL;

4
drivers/gpu/drm/etnaviv/etnaviv_dump.c
View File

@ -161,8 +161,8 @@ void etnaviv_core_dump(struct etnaviv_gpu *gpu)
file_size += sizeof(*iter.hdr) * n_obj;
/* Allocate the file in vmalloc memory, it's likely to be big */
iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_HIGHMEM |
__GFP_NOWARN | __GFP_NORETRY, PAGE_KERNEL);
iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY,
PAGE_KERNEL);
if (!iter.start) {
dev_warn(gpu->dev, "failed to allocate devcoredump file\n");
return;

2
drivers/md/dm-bufio.c
View File

@ -406,7 +406,7 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,
if (gfp_mask & __GFP_NORETRY)
noio_flag = memalloc_noio_save();
ptr = __vmalloc(c->block_size, gfp_mask | __GFP_HIGHMEM, PAGE_KERNEL);
ptr = __vmalloc(c->block_size, gfp_mask, PAGE_KERNEL);
if (gfp_mask & __GFP_NORETRY)
memalloc_noio_restore(noio_flag);

3
fs/btrfs/free-space-tree.c
View File

@ -167,8 +167,7 @@ static u8 *alloc_bitmap(u32 bitmap_size)
if (mem)
return mem;
return __vmalloc(bitmap_size, GFP_NOFS | __GFP_HIGHMEM | __GFP_ZERO,
PAGE_KERNEL);
return __vmalloc(bitmap_size, GFP_NOFS | __GFP_ZERO, PAGE_KERNEL);
}
int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,

2
fs/file.c
View File

@ -42,7 +42,7 @@ static void *alloc_fdmem(size_t size)
if (data != NULL)
return data;
}
return __vmalloc(size, GFP_KERNEL_ACCOUNT | __GFP_HIGHMEM, PAGE_KERNEL);
return __vmalloc(size, GFP_KERNEL_ACCOUNT, PAGE_KERNEL);
}
static void __free_fdtable(struct fdtable *fdt)

2
fs/xfs/kmem.c
View File

@ -67,7 +67,7 @@ kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
nofs_flag = memalloc_nofs_save();
lflags = kmem_flags_convert(flags);
ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
ptr = __vmalloc(size, lflags | __GFP_ZERO, PAGE_KERNEL);
if (flags & KM_NOFS)
memalloc_nofs_restore(nofs_flag);

9
include/drm/drm_mem_util.h
View File

@ -37,8 +37,7 @@ static __inline__ void *drm_calloc_large(size_t nmemb, size_t size)
if (size * nmemb <= PAGE_SIZE)
return kcalloc(nmemb, size, GFP_KERNEL);
return __vmalloc(size * nmemb,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
return vzalloc(size * nmemb);
}
/* Modeled after cairo's malloc_ab, it's like calloc but without the zeroing. */
@ -50,8 +49,7 @@ static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size)
if (size * nmemb <= PAGE_SIZE)
return kmalloc(nmemb * size, GFP_KERNEL);
return __vmalloc(size * nmemb,
GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
return vmalloc(size * nmemb);
}
static __inline__ void *drm_malloc_gfp(size_t nmemb, size_t size, gfp_t gfp)
@ -69,8 +67,7 @@ static __inline__ void *drm_malloc_gfp(size_t nmemb, size_t size, gfp_t gfp)
return ptr;
}
return __vmalloc(size * nmemb,
gfp | __GFP_HIGHMEM, PAGE_KERNEL);
return __vmalloc(size * nmemb, gfp, PAGE_KERNEL);
}
static __inline void drm_free_large(void *ptr)

9
kernel/bpf/core.c
View File

@ -76,8 +76,7 @@ void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, uns
struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags)
{
gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO |
gfp_extra_flags;
gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
struct bpf_prog_aux *aux;
struct bpf_prog *fp;
@ -107,8 +106,7 @@ EXPORT_SYMBOL_GPL(bpf_prog_alloc);
struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
gfp_t gfp_extra_flags)
{
gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO |
gfp_extra_flags;
gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
struct bpf_prog *fp;
u32 pages, delta;
int ret;
@ -655,8 +653,7 @@ out:
static struct bpf_prog *bpf_prog_clone_create(struct bpf_prog *fp_other,
gfp_t gfp_extra_flags)
{
gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO |
gfp_extra_flags;
gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
struct bpf_prog *fp;
fp = __vmalloc(fp_other->pages * PAGE_SIZE, gfp_flags, PAGE_KERNEL);

3
kernel/bpf/syscall.c
View File

@ -67,8 +67,7 @@ void *bpf_map_area_alloc(size_t size)
return area;
}
return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | flags,
PAGE_KERNEL);
return __vmalloc(size, GFP_KERNEL | flags, PAGE_KERNEL);
}
void bpf_map_area_free(void *area)

2
kernel/fork.c
View File

@ -221,7 +221,7 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
stack = __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
VMALLOC_START, VMALLOC_END,
THREADINFO_GFP | __GFP_HIGHMEM,
THREADINFO_GFP,
PAGE_KERNEL,
0, node, __builtin_return_address(0));

2
kernel/groups.c
View File

@ -18,7 +18,7 @@ struct group_info *groups_alloc(int gidsetsize)
len = sizeof(struct group_info) + sizeof(kgid_t) * gidsetsize;
gi = kmalloc(len, GFP_KERNEL_ACCOUNT|__GFP_NOWARN|__GFP_NORETRY);
if (!gi)
gi = __vmalloc(len, GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM, PAGE_KERNEL);
gi = __vmalloc(len, GFP_KERNEL_ACCOUNT, PAGE_KERNEL);
if (!gi)
return NULL;

2
kernel/module.c
View File

@ -2864,7 +2864,7 @@ static int copy_module_from_user(const void __user *umod, unsigned long len,
/* Suck in entire file: we'll want most of it. */
info->hdr = __vmalloc(info->len,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL);
GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL);
if (!info->hdr)
return -ENOMEM;

2
mm/kasan/kasan.c
View File

@ -691,7 +691,7 @@ int kasan_module_alloc(void *addr, size_t size)
ret = __vmalloc_node_range(shadow_size, 1, shadow_start,
shadow_start + shadow_size,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
GFP_KERNEL | __GFP_ZERO,
PAGE_KERNEL, VM_NO_GUARD, NUMA_NO_NODE,
__builtin_return_address(0));

3
mm/nommu.c
View File

@ -246,8 +246,7 @@ void *vmalloc_user(unsigned long size)
{
void *ret;
ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
PAGE_KERNEL);
ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
if (ret) {
struct vm_area_struct *vma;

2
mm/util.c
View File

@ -382,7 +382,7 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
if (ret || size <= PAGE_SIZE)
return ret;
return __vmalloc_node_flags(size, node, flags | __GFP_HIGHMEM);
return __vmalloc_node_flags(size, node, flags);
}
EXPORT_SYMBOL(kvmalloc_node);

14
mm/vmalloc.c
View File

@ -1655,7 +1655,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
struct page **pages;
unsigned int nr_pages, array_size, i;
const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
const gfp_t alloc_mask = gfp_mask | __GFP_HIGHMEM | __GFP_NOWARN;
nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
array_size = (nr_pages * sizeof(struct page *));
@ -1818,7 +1818,7 @@ EXPORT_SYMBOL(__vmalloc);
void *vmalloc(unsigned long size)
{
return __vmalloc_node_flags(size, NUMA_NO_NODE,
GFP_KERNEL | __GFP_HIGHMEM);
GFP_KERNEL);
}
EXPORT_SYMBOL(vmalloc);
@ -1835,7 +1835,7 @@ EXPORT_SYMBOL(vmalloc);
void *vzalloc(unsigned long size)
{
return __vmalloc_node_flags(size, NUMA_NO_NODE,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
GFP_KERNEL | __GFP_ZERO);
}
EXPORT_SYMBOL(vzalloc);
@ -1852,7 +1852,7 @@ void *vmalloc_user(unsigned long size)
void *ret;
ret = __vmalloc_node(size, SHMLBA,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
GFP_KERNEL | __GFP_ZERO,
PAGE_KERNEL, NUMA_NO_NODE,
__builtin_return_address(0));
if (ret) {
@ -1876,7 +1876,7 @@ EXPORT_SYMBOL(vmalloc_user);
*/
void *vmalloc_node(unsigned long size, int node)
{
return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL,
return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL,
node, __builtin_return_address(0));
}
EXPORT_SYMBOL(vmalloc_node);
@ -1896,7 +1896,7 @@ EXPORT_SYMBOL(vmalloc_node);
void *vzalloc_node(unsigned long size, int node)
{
return __vmalloc_node_flags(size, node,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
GFP_KERNEL | __GFP_ZERO);
}
EXPORT_SYMBOL(vzalloc_node);
@ -1918,7 +1918,7 @@ EXPORT_SYMBOL(vzalloc_node);
void *vmalloc_exec(unsigned long size)
{
return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC,
return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL_EXEC,
NUMA_NO_NODE, __builtin_return_address(0));
}

2
net/ceph/ceph_common.c
View File

@ -187,7 +187,7 @@ void *ceph_kvmalloc(size_t size, gfp_t flags)
return ptr;
}
return __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
return __vmalloc(size, flags, PAGE_KERNEL);
}

3
net/netfilter/x_tables.c
View File

@ -998,8 +998,7 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
info = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
if (!info) {
info = __vmalloc(sz, GFP_KERNEL | __GFP_NOWARN |
__GFP_NORETRY | __GFP_HIGHMEM,
info = __vmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY,
PAGE_KERNEL);
if (!info)
return NULL;