[PATCH] tree wide: Use kvfree() than conditional kfree()/vfree()

Tetsuo Handa
2015-11-09T11:58:09Z

There are many locations that do

if (memory_was_allocated_by_vmalloc)
vfree(ptr);
else
kfree(ptr);

but kvfree() can handle both kmalloc()ed memory and vmalloc()ed memory
using is_vmalloc_addr(). Unless callers have special reasons, we can
replace this branch with kvfree(). Please check and reply if you found
problems.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Russell King <linux@arm.linux.org.uk> # arm
Cc: <linux-acpi@vger.kernel.org> # apei
Cc: <drbd-user@lists.linbit.com> # drbd
Cc: <linux-kernel@vger.kernel.org> # mspec
Cc: <dri-devel@lists.freedesktop.org> # drm
Cc: Oleg Drokin <oleg.drokin@intel.com> # lustre
Cc: Andreas Dilger <andreas.dilger@intel.com> # lustre
Cc: <codalist@coda.cs.cmu.edu> # coda
Cc: <linux-mtd@lists.infradead.org> # jffs2
Cc: Jan Kara <jack@suse.com> # udf
Cc: <linux-fsdevel@vger.kernel.org> # xattr
Cc: <linux-mm@kvack.org> # ipc + mm
Cc: <netdev@vger.kernel.org> # ipv4
---
arch/arm/mm/dma-mapping.c | 11 ++------
drivers/acpi/apei/erst.c | 6 ++--
drivers/block/drbd/drbd_bitmap.c | 26 +++++------------
drivers/block/drbd/drbd_int.h | 3 --
drivers/char/mspec.c | 15 ++--------
drivers/gpu/drm/drm_hashtab.c | 5 +---
.../lustre/include/linux/libcfs/libcfs_private.h | 8 ++----
fs/coda/coda_linux.h | 3 +-
fs/jffs2/build.c | 8 ++----
fs/jffs2/fs.c | 5 +---
fs/jffs2/super.c | 5 +---
fs/udf/super.c | 7 +----
fs/xattr.c | 33 ++++++----------------
ipc/sem.c | 2 +-
ipc/util.c | 11 ++------
ipc/util.h | 2 +-
mm/percpu.c | 18 +++++-------
mm/vmalloc.c | 5 +---
net/ipv4/fib_trie.c | 4 +--
19 files changed, 46 insertions(+), 131 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index e62400e..492bf3e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1200,10 +1200,7 @@ error:
while (i--)
if (pages[i])
__free_pages(pages[i], 0);
- if (array_size <= PAGE_SIZE)
- kfree(pages);
- else
- vfree(pages);
+ kvfree(pages);
return NULL;
}

@@ -1211,7 +1208,6 @@ static int __iommu_free_buffer(struct device *dev, struct page **pages,
size_t size, struct dma_attrs *attrs)
{
int count = size >> PAGE_SHIFT;
- int array_size = count * sizeof(struct page *);
int i;

if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs)) {
@@ -1222,10 +1218,7 @@ static int __iommu_free_buffer(struct device *dev, struct page **pages,
__free_pages(pages[i], 0);
}

- if (array_size <= PAGE_SIZE)
- kfree(pages);
- else
- vfree(pages);
+ kvfree(pages);
return 0;
}

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 6682c5d..6e6bc10 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -32,6 +32,7 @@
#include <linux/hardirq.h>
#include <linux/pstore.h>
#include <linux/vmalloc.h>
+#include <linux/mm.h> /* kvfree() */
#include <acpi/apei.h>

#include "apei-internal.h"
@@ -532,10 +533,7 @@ retry:
return -ENOMEM;
memcpy(new_entries, entries,
erst_record_id_cache.len * sizeof(entries[0]));
- if (erst_record_id_cache.size < PAGE_SIZE)
- kfree(entries);
- else
- vfree(entries);
+ kvfree(entries);
erst_record_id_cache.entries = entries = new_entries;
erst_record_id_cache.size = new_size;
}
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 9462d27..2daaafb 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -364,12 +364,9 @@ static void bm_free_pages(struct page **pages, unsigned long number)
}
}

-static void bm_vk_free(void *ptr, int v)
+static inline void bm_vk_free(void *ptr)
{
- if (v)
- vfree(ptr);
- else
- kfree(ptr);
+ kvfree(ptr);
}

/*
@@ -379,7 +376,7 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
{
struct page **old_pages = b->bm_pages;
struct page **new_pages, *page;
- unsigned int i, bytes, vmalloced = 0;
+ unsigned int i, bytes;
unsigned long have = b->bm_number_of_pages;

BUG_ON(have == 0 && old_pages != NULL);
@@ -401,7 +398,6 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
PAGE_KERNEL);
if (!new_pages)
return NULL;
- vmalloced = 1;
}

if (want >= have) {
@@ -411,7 +407,7 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
page = alloc_page(GFP_NOIO | __GFP_HIGHMEM);
if (!page) {
bm_free_pages(new_pages + have, i - have);
- bm_vk_free(new_pages, vmalloced);
+ bm_vk_free(new_pages);
return NULL;
}
/* we want to know which page it is
@@ -427,11 +423,6 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
*/
}

- if (vmalloced)
- b->bm_flags |= BM_P_VMALLOCED;
- else
- b->bm_flags &= ~BM_P_VMALLOCED;
-
return new_pages;
}

@@ -469,7 +460,7 @@ void drbd_bm_cleanup(struct drbd_device *device)
if (!expect(device->bitmap))
return;
bm_free_pages(device->bitmap->bm_pages, device->bitmap->bm_number_of_pages);
- bm_vk_free(device->bitmap->bm_pages, (BM_P_VMALLOCED & device->bitmap->bm_flags));
+ bm_vk_free(device->bitmap->bm_pages);
kfree(device->bitmap);
device->bitmap = NULL;
}
@@ -639,7 +630,6 @@ int drbd_bm_resize(struct drbd_device *device, sector_t capacity, int set_new_bi
unsigned long want, have, onpages; /* number of pages */
struct page **npages, **opages = NULL;
int err = 0, growing;
- int opages_vmalloced;

if (!expect(b))
return -ENOMEM;
@@ -652,8 +642,6 @@ int drbd_bm_resize(struct drbd_device *device, sector_t capacity, int set_new_bi
if (capacity == b->bm_dev_capacity)
goto out;

- opages_vmalloced = (BM_P_VMALLOCED & b->bm_flags);
-
if (capacity == 0) {
spin_lock_irq(&b->bm_lock);
opages = b->bm_pages;
@@ -667,7 +655,7 @@ int drbd_bm_resize(struct drbd_device *device, sector_t capacity, int set_new_bi
b->bm_dev_capacity = 0;
spin_unlock_irq(&b->bm_lock);
bm_free_pages(opages, onpages);
- bm_vk_free(opages, opages_vmalloced);
+ bm_vk_free(opages);
goto out;
}
bits = BM_SECT_TO_BIT(ALIGN(capacity, BM_SECT_PER_BIT));
@@ -740,7 +728,7 @@ int drbd_bm_resize(struct drbd_device *device, sector_t capacity, int set_new_bi

spin_unlock_irq(&b->bm_lock);
if (opages != npages)
- bm_vk_free(opages, opages_vmalloced);
+ bm_vk_free(opages);
if (!growing)
b->bm_set = bm_count_bits(b);
drbd_info(device, "resync bitmap: bits=%lu words=%lu pages=%lu\n", bits, words, want);
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index e66d453..07e75ae 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -541,9 +541,6 @@ struct drbd_bitmap; /* opaque for drbd_device */
/* definition of bits in bm_flags to be used in drbd_bm_lock
* and drbd_bitmap_io and friends. */
enum bm_flag {
- /* do we need to kfree, or vfree bm_pages? */
- BM_P_VMALLOCED = 0x10000, /* internal use only, will be masked out */
-
/* currently locked for bulk operation */
BM_LOCKED_MASK = 0xf,

diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
index f1d7fa4..f3f92d5 100644
--- a/drivers/char/mspec.c
+++ b/drivers/char/mspec.c
@@ -93,14 +93,11 @@ struct vma_data {
spinlock_t lock; /* Serialize access to this structure. */
int count; /* Number of pages allocated. */
enum mspec_page_type type; /* Type of pages allocated. */
- int flags; /* See VMD_xxx below. */
unsigned long vm_start; /* Original (unsplit) base. */
unsigned long vm_end; /* Original (unsplit) end. */
unsigned long maddr[0]; /* Array of MSPEC addresses. */
};

-#define VMD_VMALLOCED 0x1 /* vmalloc'd rather than kmalloc'd */
-
/* used on shub2 to clear FOP cache in the HUB */
static unsigned long scratch_page[MAX_NUMNODES];
#define SH2_AMO_CACHE_ENTRIES 4
@@ -185,10 +182,7 @@ mspec_close(struct vm_area_struct *vma)
"failed to zero page %ld\n", my_page);
}

- if (vdata->flags & VMD_VMALLOCED)
- vfree(vdata);
- else
- kfree(vdata);
+ kvfree(vdata);
}

/*
@@ -256,7 +250,7 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
enum mspec_page_type type)
{
struct vma_data *vdata;
- int pages, vdata_size, flags = 0;
+ int pages, vdata_size;

if (vma->vm_pgoff != 0)
return -EINVAL;
@@ -271,16 +265,13 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
if (vdata_size <= PAGE_SIZE)
vdata = kzalloc(vdata_size, GFP_KERNEL);
- else {
+ else
vdata = vzalloc(vdata_size);
- flags = VMD_VMALLOCED;
- }
if (!vdata)
return -ENOMEM;

vdata->vm_start = vma->vm_start;
vdata->vm_end = vma->vm_end;
- vdata->flags = flags;
vdata->type = type;
spin_lock_init(&vdata->lock);
atomic_set(&vdata->refcnt, 1);
diff --git a/drivers/gpu/drm/drm_hashtab.c b/drivers/gpu/drm/drm_hashtab.c
index c3b80fd..7b30b30 100644
--- a/drivers/gpu/drm/drm_hashtab.c
+++ b/drivers/gpu/drm/drm_hashtab.c
@@ -198,10 +198,7 @@ EXPORT_SYMBOL(drm_ht_remove_item);
void drm_ht_remove(struct drm_open_hash *ht)
{
if (ht->table) {
- if ((PAGE_SIZE / sizeof(*ht->table)) >> ht->order)
- kfree(ht->table);
- else
- vfree(ht->table);
+ kvfree(ht->table);
ht->table = NULL;
}
}
diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h
index f0b0423..f40fa98 100644
--- a/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h
@@ -151,16 +151,12 @@ do { \

#define LIBCFS_FREE(ptr, size) \
do { \
- int s = (size); \
if (unlikely((ptr) == NULL)) { \
CERROR("LIBCFS: free NULL '" #ptr "' (%d bytes) at " \
- "%s:%d\n", s, __FILE__, __LINE__); \
+ "%s:%d\n", (int)(size), __FILE__, __LINE__); \
break; \
} \
- if (unlikely(s > LIBCFS_VMALLOC_SIZE)) \
- vfree(ptr); \
- else \
- kfree(ptr); \
+ kvfree(ptr); \
} while (0)

/******************************************************************************/
diff --git a/fs/coda/coda_linux.h b/fs/coda/coda_linux.h
index f829fe9..5104d84 100644
--- a/fs/coda/coda_linux.h
+++ b/fs/coda/coda_linux.h
@@ -72,8 +72,7 @@ void coda_sysctl_clean(void);
} while (0)

-#define CODA_FREE(ptr,size) \
- do { if (size < PAGE_SIZE) kfree((ptr)); else vfree((ptr)); } while (0)
+#define CODA_FREE(ptr, size) kvfree((ptr))

/* inode to cnode access functions */

diff --git a/fs/jffs2/build.c b/fs/jffs2/build.c
index a3750f9..0ae91ad 100644
--- a/fs/jffs2/build.c
+++ b/fs/jffs2/build.c
@@ -17,6 +17,7 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mtd/mtd.h>
+#include <linux/mm.h> /* kvfree() */
#include "nodelist.h"

static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *,
@@ -383,12 +384,7 @@ int jffs2_do_mount_fs(struct jffs2_sb_info *c)
return 0;

out_free:
-#ifndef __ECOS
- if (jffs2_blocks_use_vmalloc(c))
- vfree(c->blocks);
- else
-#endif
- kfree(c->blocks);
+ kvfree(c->blocks);

return ret;
}
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index 2caf168..bead25a 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -596,10 +596,7 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
out_root:
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
- if (jffs2_blocks_use_vmalloc(c))
- vfree(c->blocks);
- else
- kfree(c->blocks);
+ kvfree(c->blocks);
out_inohash:
jffs2_clear_xattr_subsystem(c);
kfree(c->inocache_list);
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index d86c5e3..3749e65 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -331,10 +331,7 @@ static void jffs2_put_super (struct super_block *sb)

jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
- if (jffs2_blocks_use_vmalloc(c))
- vfree(c->blocks);
- else
- kfree(c->blocks);
+ kvfree(c->blocks);
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
jffs2_clear_xattr_subsystem(c);
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 81155b9..0ecd754 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -278,17 +278,12 @@ static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
int i;
int nr_groups = bitmap->s_nr_groups;
- int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
- nr_groups);

for (i = 0; i < nr_groups; i++)
if (bitmap->s_block_bitmap[i])
brelse(bitmap->s_block_bitmap[i]);

- if (size <= PAGE_SIZE)
- kfree(bitmap);
- else
- vfree(bitmap);
+ kvfree(bitmap);
}

static void udf_free_partition(struct udf_part_map *map)
diff --git a/fs/xattr.c b/fs/xattr.c
index 072fee1..6276b04 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -324,7 +324,6 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
{
int error;
void *kvalue = NULL;
- void *vvalue = NULL; /* If non-NULL, we used vmalloc() */
char kname[XATTR_NAME_MAX + 1];

if (flags & ~(XATTR_CREATE|XATTR_REPLACE))
@@ -341,10 +340,9 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
return -E2BIG;
kvalue = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!kvalue) {
- vvalue = vmalloc(size);
- if (!vvalue)
+ kvalue = vmalloc(size);
+ if (!kvalue)
return -ENOMEM;
- kvalue = vvalue;
}
if (copy_from_user(kvalue, value, size)) {
error = -EFAULT;
@@ -357,10 +355,7 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,

error = vfs_setxattr(d, kname, kvalue, size, flags);
out:
- if (vvalue)
- vfree(vvalue);
- else
- kfree(kvalue);
+ kvfree(kvalue);
return error;
}

@@ -428,7 +423,6 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
{
ssize_t error;
void *kvalue = NULL;
- void *vvalue = NULL;
char kname[XATTR_NAME_MAX + 1];

error = strncpy_from_user(kname, name, sizeof(kname));
@@ -442,10 +436,9 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
size = XATTR_SIZE_MAX;
kvalue = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!kvalue) {
- vvalue = vmalloc(size);
- if (!vvalue)
+ kvalue = vmalloc(size);
+ if (!kvalue)
return -ENOMEM;
- kvalue = vvalue;
}
}

@@ -461,10 +454,7 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
than XATTR_SIZE_MAX bytes. Not possible. */
error = -E2BIG;
}
- if (vvalue)
- vfree(vvalue);
- else
- kfree(kvalue);
+ kvfree(kvalue);
return error;
}

@@ -521,17 +511,15 @@ listxattr(struct dentry *d, char __user *list, size_t size)
{
ssize_t error;
char *klist = NULL;
- char *vlist = NULL; /* If non-NULL, we used vmalloc() */

if (size) {
if (size > XATTR_LIST_MAX)
size = XATTR_LIST_MAX;
klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL);
if (!klist) {
- vlist = vmalloc(size);
- if (!vlist)
+ klist = vmalloc(size);
+ if (!klist)
return -ENOMEM;
- klist = vlist;
}
}

@@ -544,10 +532,7 @@ listxattr(struct dentry *d, char __user *list, size_t size)
than XATTR_LIST_MAX bytes. Not possible. */
error = -E2BIG;
}
- if (vlist)
- vfree(vlist);
- else
- kfree(klist);
+ kvfree(klist);
return error;
}

diff --git a/ipc/sem.c b/ipc/sem.c
index b471e5a..cddd5b5 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1493,7 +1493,7 @@ out_rcu_wakeup:
wake_up_sem_queue_do(&tasks);
out_free:
if (sem_io != fast_sem_io)
- ipc_free(sem_io, sizeof(ushort)*nsems);
+ ipc_free(sem_io);
return err;
}

diff --git a/ipc/util.c b/ipc/util.c
index 0f401d9..798cad1 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -414,17 +414,12 @@ void *ipc_alloc(int size)
/**
* ipc_free - free ipc space
* @ptr: pointer returned by ipc_alloc
- * @size: size of block
*
- * Free a block created with ipc_alloc(). The caller must know the size
- * used in the allocation call.
+ * Free a block created with ipc_alloc().
*/
-void ipc_free(void *ptr, int size)
+void ipc_free(void *ptr)
{
- if (size > PAGE_SIZE)
- vfree(ptr);
- else
- kfree(ptr);
+ kvfree(ptr);
}

/**
diff --git a/ipc/util.h b/ipc/util.h
index 3a8a5a0..51f7ca5 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -118,7 +118,7 @@ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);
* both function can sleep
*/
void *ipc_alloc(int size);
-void ipc_free(void *ptr, int size);
+void ipc_free(void *ptr);

/*
* For allocation that need to be freed by RCU.
diff --git a/mm/percpu.c b/mm/percpu.c
index 8a943b9..998607a 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -305,16 +305,12 @@ static void *pcpu_mem_zalloc(size_t size)
/**
* pcpu_mem_free - free memory
* @ptr: memory to free
- * @size: size of the area
*
* Free @ptr. @ptr should have been allocated using pcpu_mem_zalloc().
*/
-static void pcpu_mem_free(void *ptr, size_t size)
+static void pcpu_mem_free(void *ptr)
{
- if (size <= PAGE_SIZE)
- kfree(ptr);
- else
- vfree(ptr);
+ kvfree(ptr);
}

/**
@@ -463,8 +459,8 @@ out_unlock:
* pcpu_mem_free() might end up calling vfree() which uses
* IRQ-unsafe lock and thus can't be called under pcpu_lock.
*/
- pcpu_mem_free(old, old_size);
- pcpu_mem_free(new, new_size);
+ pcpu_mem_free(old);
+ pcpu_mem_free(new);

return 0;
}
@@ -732,7 +728,7 @@ static struct pcpu_chunk *pcpu_alloc_chunk(void)
chunk->map = pcpu_mem_zalloc(PCPU_DFL_MAP_ALLOC *
sizeof(chunk->map[0]));
if (!chunk->map) {
- pcpu_mem_free(chunk, pcpu_chunk_struct_size);
+ pcpu_mem_free(chunk);
return NULL;
}

@@ -753,8 +749,8 @@ static void pcpu_free_chunk(struct pcpu_chunk *chunk)
{
if (!chunk)
return;
- pcpu_mem_free(chunk->map, chunk->map_alloc * sizeof(chunk->map[0]));
- pcpu_mem_free(chunk, pcpu_chunk_struct_size);
+ pcpu_mem_free(chunk->map);
+ pcpu_mem_free(chunk);
}

/**
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d045634..b1c9fe8 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1481,10 +1481,7 @@ static void __vunmap(const void *addr, int deallocate_pages)
__free_page(page);
}

- if (area->flags & VM_VPAGES)
- vfree(area->pages);
- else
- kfree(area->pages);
+ kvfree(area->pages);
}

kfree(area);
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 744e593..7aea0cc 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -289,10 +289,8 @@ static void __node_free_rcu(struct rcu_head *head)

if (!n->tn_bits)
kmem_cache_free(trie_leaf_kmem, n);
- else if (n->tn_bits <= TNODE_KMALLOC_MAX)
- kfree(n);
else
- vfree(n);
+ kvfree(n);
}

#define node_free(n) call_rcu(&tn_info(n)->rcu, __node_free_rcu)
--
1.8.3.1