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mm: allow !GFP_KERNEL allocations for kvmalloc

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Support for GFP_NO{FS,IO} and __GFP_NOFAIL has been implemented by
previous patches so we can allow the support for kvmalloc.  This will
allow some external users to simplify or completely remove their
helpers.

GFP_NOWAIT semantic hasn't been supported so far but it hasn't been
explicitly documented so let's add a note about that.

ceph_kvmalloc is the first helper to be dropped and changed to kvmalloc.

Link: https://lkml.kernel.org/r/20211122153233.9924-5-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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 2022-01-14 14:07:07 -08:00 committed by Linus Torvalds
parent 30d3f01191
commit a421ef3030
8 changed files with 15 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/ceph/libceph.h
View File

@ -295,7 +295,6 @@ extern bool libceph_compatible(void *data);
extern const char *ceph_msg_type_name(int type);
extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
extern void *ceph_kvmalloc(size_t size, gfp_t flags);
struct fs_parameter;
struct fc_log;

15
mm/util.c
View File

@ -549,13 +549,10 @@ EXPORT_SYMBOL(vm_mmap);
* Uses kmalloc to get the memory but if the allocation fails then falls back
* to the vmalloc allocator. Use kvfree for freeing the memory.
*
* Reclaim modifiers - __GFP_NORETRY and __GFP_NOFAIL are not supported.
* GFP_NOWAIT and GFP_ATOMIC are not supported, neither is the __GFP_NORETRY modifier.
* __GFP_RETRY_MAYFAIL is supported, and it should be used only if kmalloc is
* preferable to the vmalloc fallback, due to visible performance drawbacks.
*
* Please note that any use of gfp flags outside of GFP_KERNEL is careful to not
* fall back to vmalloc.
*
* Return: pointer to the allocated memory of %NULL in case of failure
*/
void *kvmalloc_node(size_t size, gfp_t flags, int node)
@ -563,13 +560,6 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
gfp_t kmalloc_flags = flags;
void *ret;
/*
* vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
* so the given set of flags has to be compatible.
*/
if ((flags & GFP_KERNEL) != GFP_KERNEL)
return kmalloc_node(size, flags, node);
/*
* We want to attempt a large physically contiguous block first because
* it is less likely to fragment multiple larger blocks and therefore
@ -582,6 +572,9 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
if (!(kmalloc_flags & __GFP_RETRY_MAYFAIL))
kmalloc_flags |= __GFP_NORETRY;
/* nofail semantic is implemented by the vmalloc fallback */
kmalloc_flags &= ~__GFP_NOFAIL;
}
ret = kmalloc_node(size, kmalloc_flags, node);

4
net/ceph/buffer.c
View File

@ -7,7 +7,7 @@
#include <linux/ceph/buffer.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/libceph.h> /* for ceph_kvmalloc */
#include <linux/ceph/libceph.h> /* for kvmalloc */
struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
{
@ -17,7 +17,7 @@ struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
if (!b)
return NULL;
b->vec.iov_base = ceph_kvmalloc(len, gfp);
b->vec.iov_base = kvmalloc(len, gfp);
if (!b->vec.iov_base) {
kfree(b);
return NULL;

27
net/ceph/ceph_common.c
View File

@ -190,33 +190,6 @@ int ceph_compare_options(struct ceph_options *new_opt,
}
EXPORT_SYMBOL(ceph_compare_options);
/*
* kvmalloc() doesn't fall back to the vmalloc allocator unless flags are
* compatible with (a superset of) GFP_KERNEL. This is because while the
* actual pages are allocated with the specified flags, the page table pages
* are always allocated with GFP_KERNEL.
*
* ceph_kvmalloc() may be called with GFP_KERNEL, GFP_NOFS or GFP_NOIO.
*/
void *ceph_kvmalloc(size_t size, gfp_t flags)
{
void *p;
if ((flags & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) {
p = kvmalloc(size, flags);
} else if ((flags & (__GFP_IO | __GFP_FS)) == __GFP_IO) {
unsigned int nofs_flag = memalloc_nofs_save();
p = kvmalloc(size, GFP_KERNEL);
memalloc_nofs_restore(nofs_flag);
} else {
unsigned int noio_flag = memalloc_noio_save();
p = kvmalloc(size, GFP_KERNEL);
memalloc_noio_restore(noio_flag);
}
return p;
}
static int parse_fsid(const char *str, struct ceph_fsid *fsid)
{
int i = 0;

2
net/ceph/crypto.c
View File

@ -147,7 +147,7 @@ void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
static const u8 *aes_iv = (u8 *)CEPH_AES_IV;
/*
* Should be used for buffers allocated with ceph_kvmalloc().
* Should be used for buffers allocated with kvmalloc().
* Currently these are encrypt out-buffer (ceph_buffer) and decrypt
* in-buffer (msg front).
*

2
net/ceph/messenger.c
View File

@ -1920,7 +1920,7 @@ struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items,
/* front */
if (front_len) {
m->front.iov_base = ceph_kvmalloc(front_len, flags);
m->front.iov_base = kvmalloc(front_len, flags);
if (m->front.iov_base == NULL) {
dout("ceph_msg_new can't allocate %d bytes\n",
front_len);

2
net/ceph/messenger_v2.c
View File

@ -308,7 +308,7 @@ static void *alloc_conn_buf(struct ceph_connection *con, int len)
if (WARN_ON(con->v2.conn_buf_cnt >= ARRAY_SIZE(con->v2.conn_bufs)))
return NULL;
buf = ceph_kvmalloc(len, GFP_NOIO);
buf = kvmalloc(len, GFP_NOIO);
if (!buf)
return NULL;

12
net/ceph/osdmap.c
View File

@ -980,7 +980,7 @@ static struct crush_work *alloc_workspace(const struct crush_map *c)
work_size = crush_work_size(c, CEPH_PG_MAX_SIZE);
dout("%s work_size %zu bytes\n", __func__, work_size);
work = ceph_kvmalloc(work_size, GFP_NOIO);
work = kvmalloc(work_size, GFP_NOIO);
if (!work)
return NULL;
@ -1190,9 +1190,9 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, u32 max)
if (max == map->max_osd)
return 0;
state = ceph_kvmalloc(array_size(max, sizeof(*state)), GFP_NOFS);
weight = ceph_kvmalloc(array_size(max, sizeof(*weight)), GFP_NOFS);
addr = ceph_kvmalloc(array_size(max, sizeof(*addr)), GFP_NOFS);
state = kvmalloc(array_size(max, sizeof(*state)), GFP_NOFS);
weight = kvmalloc(array_size(max, sizeof(*weight)), GFP_NOFS);
addr = kvmalloc(array_size(max, sizeof(*addr)), GFP_NOFS);
if (!state || !weight || !addr) {
kvfree(state);
kvfree(weight);
@ -1222,7 +1222,7 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, u32 max)
if (map->osd_primary_affinity) {
u32 *affinity;
affinity = ceph_kvmalloc(array_size(max, sizeof(*affinity)),
affinity = kvmalloc(array_size(max, sizeof(*affinity)),
GFP_NOFS);
if (!affinity)
return -ENOMEM;
@ -1503,7 +1503,7 @@ static int set_primary_affinity(struct ceph_osdmap *map, int osd, u32 aff)
if (!map->osd_primary_affinity) {
int i;
map->osd_primary_affinity = ceph_kvmalloc(
map->osd_primary_affinity = kvmalloc(
array_size(map->max_osd, sizeof(*map->osd_primary_affinity)),
GFP_NOFS);
if (!map->osd_primary_affinity)