bcachefs-tools/include/linux/vmalloc.h

#ifndef __TOOLS_LINUX_VMALLOC_H
#define __TOOLS_LINUX_VMALLOC_H

#include <stdlib.h>
#include <sys/mman.h>

#include "tools-util.h"

#define PAGE_KERNEL		0
#define PAGE_KERNEL_EXEC	1

#define vfree(p)		free(p)

static inline void *__vmalloc(unsigned long size, gfp_t gfp_mask, unsigned prot)
{
	void *p = aligned_alloc(PAGE_SIZE, size);

	if (p && prot == PAGE_KERNEL_EXEC) {
		if (mprotect(p, size, PROT_READ|PROT_WRITE|PROT_EXEC)) {
			vfree(p);
			p = NULL;
		}
	}

	if (p && (gfp_mask & __GFP_ZERO))
		memset(p, 0, size);

	return p;
}

static inline void *vmalloc(unsigned long size)
{
	return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL);
}

static inline void *vzalloc(unsigned long size)
{
	return __vmalloc(size, GFP_KERNEL|__GFP_ZERO, PAGE_KERNEL);
}

#endif /* __TOOLS_LINUX_VMALLOC_H */