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#ifndef __BACKPORT_MM_H
#define __BACKPORT_MM_H
#include_next <linux/mm.h>
#include <linux/page_ref.h>
#include <linux/sched.h>
#include <linux/overflow.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#if LINUX_VERSION_IS_LESS(3,15,0)
#define kvfree LINUX_BACKPORT(kvfree)
void kvfree(const void *addr);
#endif /* < 3.15 */
#if LINUX_VERSION_IS_LESS(4,12,0)
#define kvmalloc LINUX_BACKPORT(kvmalloc)
static inline void *kvmalloc(size_t size, gfp_t flags)
{
gfp_t kmalloc_flags = flags;
void *ret;
if ((flags & GFP_KERNEL) != GFP_KERNEL)
return kmalloc(size, flags);
if (size > PAGE_SIZE)
kmalloc_flags |= __GFP_NOWARN | __GFP_NORETRY;
ret = kmalloc(size, flags);
if (ret || size < PAGE_SIZE)
return ret;
return vmalloc(size);
}
#define kvmalloc_array LINUX_BACKPORT(kvmalloc_array)
static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
{
size_t bytes;
if (unlikely(check_mul_overflow(n, size, &bytes)))
return NULL;
return kvmalloc(bytes, flags);
}
#define kvzalloc LINUX_BACKPORT(kvzalloc)
static inline void *kvzalloc(size_t size, gfp_t flags)
{
return kvmalloc(size, flags | __GFP_ZERO);
}
#endif
#endif /* __BACKPORT_MM_H */
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