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

From: Michal Hocko
Date: Mon Nov 09 2015 - 05:48:54 EST

On Sat 07-11-15 20:44:25, Tetsuo Handa wrote:
> 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().

Yes I agree this is preferable. Doing size assumptions or convolute the
code with additional flags (e.g. drbd) is very error prone and harder
to follow. Using kvfree in those places is much more easier to read
and understand while it shouldn't make the code more heavy because
is_vmalloc_addr is a simple check.

> Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>

I am not familiar with most of the patched code but it seems doing the
right thing AFAICT. So for what-ever this is worth
Acked-by: Michal Hocko <mhocko@xxxxxxxx>

I think you should CC all the relevant maintainers though.

> ---
> 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 | 8 ++----
> ipc/util.h | 2 +-
> mm/percpu.c | 18 +++++-------
> mm/vmalloc.c | 5 +---
> net/ipv4/fib_trie.c | 4 +--
> 19 files changed, 45 insertions(+), 129 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..a090fb7 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 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 015c6e9..dd8795d 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..3bccdf3 100644
> --- a/ipc/util.c
> +++ b/ipc/util.c
> @@ -414,17 +414,13 @@ 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.
> */
> -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

--
Michal Hocko
SUSE Labs
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