[lttng-modules.git] / include / wrapper / vmalloc.h

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * wrapper/vmalloc.h
 *
 * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
 * available, else we need to have a kernel that exports this function to GPL
 * modules.
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _LTTNG_WRAPPER_VMALLOC_H
#define _LTTNG_WRAPPER_VMALLOC_H

#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>

#ifdef CONFIG_KALLSYMS

#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
#include <lttng/kernel-version.h>

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))

/*
 * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
 * are now synchronized when they are created or torn down.
 */
static inline
void wrapper_vmalloc_sync_mappings(void)
{}

#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
  || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0)            \
  || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
  || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
  || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0)         \
  || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0)         \
  || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0)          \
  || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0))	  \
  || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0)   \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)

static inline
void wrapper_vmalloc_sync_mappings(void)
{
	void (*vmalloc_sync_mappings_sym)(void);

	vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
	if (vmalloc_sync_mappings_sym) {
		vmalloc_sync_mappings_sym();
	} else {
#ifdef CONFIG_X86
		/*
		 * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
		 * trigger recursive page faults.
		 */
		printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
		printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
	}
}

/*
 * Canary function to check for 'vmalloc_sync_mappings()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   void vmalloc_sync_mappings(void);
 */
static inline
void __canary__vmalloc_sync_mappings(void)
{
	vmalloc_sync_mappings();
}

#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

/*
 * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6.
 */
static inline
void wrapper_vmalloc_sync_mappings(void)
{
	void (*vmalloc_sync_all_sym)(void);

	vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all");
	if (vmalloc_sync_all_sym) {
		vmalloc_sync_all_sym();
	} else {
#ifdef CONFIG_X86
		/*
		 * Only x86 needs vmalloc_sync_all to make sure LTTng does not
		 * trigger recursive page faults.
		 */
		printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
		printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
	}
}

/*
 * Canary function to check for 'vmalloc_sync_all()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   void vmalloc_sync_all(void);
 */
static inline
void __canary__vmalloc_sync_all(void)
{
	vmalloc_sync_all();
}

#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

#else

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
  || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0)            \
  || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
  || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
  || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0)         \
  || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0)         \
  || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0)          \
  || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0))	  \
  || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0)   \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)

static inline
void wrapper_vmalloc_sync_mappings(void)
{
	return vmalloc_sync_mappings();
}

#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

static inline
void wrapper_vmalloc_sync_mappings(void)
{
	return vmalloc_sync_all();
}

#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

#endif

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
static inline
void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
{
	void *ret;

	ret = kvmalloc_node(size, flags, node);
	if (is_vmalloc_addr(ret)) {
		/*
		 * Make sure we don't trigger recursive page faults in the
		 * tracing fast path.
		 */
		wrapper_vmalloc_sync_mappings();
	}
	return ret;
}

static inline
void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
{
	return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
}

static inline
void *lttng_kvmalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void *lttng_kvzalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void lttng_kvfree(const void *addr)
{
	kvfree(addr);
}

#else

#include <linux/slab.h>

static inline
void print_vmalloc_node_range_warning(void)
{
	printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n");
	printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n");
	printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
}

/*
 * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
 */
static inline
void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller)
{
#ifdef CONFIG_KALLSYMS
	/*
	 * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
	 */
	void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller);

	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	if (lttng__vmalloc_node_range)
		return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
				vm_flags, node, caller);
#endif
	if (node != NUMA_NO_NODE)
		print_vmalloc_node_range_warning();
	return __vmalloc(size, gfp_mask, prot);
}

/*
 * Canary function to check for '__vmalloc_node_range()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 *                           unsigned long start, unsigned long end, gfp_t gfp_mask,
 *                           pgprot_t prot, unsigned long vm_flags, int node,
 *                           const void *caller);
 */
static inline
void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller)
{
	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
			vm_flags, node, caller);
}

/**
 * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
 * failure, fall back to non-contiguous (vmalloc) allocation.
 * @size: size of the request.
 * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL.
 *
 * Uses kmalloc to get the memory but if the allocation fails then falls back
 * to the vmalloc allocator. Use lttng_kvfree to free the memory.
 *
 * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported
 */
static inline
void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
{
	void *ret;

	/*
	 * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
	 * so the given set of flags has to be compatible.
	 */
	WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);

	/*
	 * If the allocation fits in a single page, do not fallback.
	 */
	if (size <= PAGE_SIZE) {
		return kmalloc_node(size, flags, node);
	}

	/*
	 * Make sure that larger requests are not too disruptive - no OOM
	 * killer and no allocation failure warnings as we have a fallback
	 */
	ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node);
	if (!ret) {
		ret = __lttng_vmalloc_node_range(size, 1,
				VMALLOC_START, VMALLOC_END,
				flags | __GFP_HIGHMEM, PAGE_KERNEL, 0,
				node, __builtin_return_address(0));
		/*
		 * Make sure we don't trigger recursive page faults in the
		 * tracing fast path.
		 */
		wrapper_vmalloc_sync_mappings();
	}
	return ret;
}

static inline
void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
{
	return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
}

static inline
void *lttng_kvmalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void *lttng_kvzalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void lttng_kvfree(const void *addr)
{
	if (is_vmalloc_addr(addr)) {
		vfree(addr);
	} else {
		kfree(addr);
	}
}
#endif

#endif /* _LTTNG_WRAPPER_VMALLOC_H */
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed	2	*
886d51a3	3	* wrapper/vmalloc.h
6d2a620c MD	4	*
	5	* wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
	6	* available, else we need to have a kernel that exports this function to GPL
	7	* modules.
	8	*
886d51a3	9	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6d2a620c MD	10	*/
6d2a620c MD	11
9f36eaed MJ	12	#ifndef _LTTNG_WRAPPER_VMALLOC_H
	13	#define _LTTNG_WRAPPER_VMALLOC_H
	14
48f5e0b5 MJ	15	#include <linux/version.h>
48f5e0b5 MJ	16	#include <linux/vmalloc.h>
01ab5113	17	#include <linux/mm.h>
48f5e0b5	18
6d2a620c MD	19	#ifdef CONFIG_KALLSYMS
	20
	21	#include <linux/kallsyms.h>
5a2f5e92	22	#include <wrapper/kallsyms.h>
2b3dbafc	23	#include <lttng/kernel-version.h>
6d2a620c	24
0dcc94fa MJ	25	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
	26
	27	/*
	28	* wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
	29	* are now synchronized when they are created or torn down.
	30	*/
	31	static inline
	32	void wrapper_vmalloc_sync_mappings(void)
	33	{}
	34
	35	#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
9bfe744a	36	\|\| LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
2b3dbafc OP	37	\|\| LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
	38	\|\| LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
	39	\|\| LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
	40	\|\| LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
	41	\|\| LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
2e4c781e SB	42	\|\| LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
	43	\|\| LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \
	44	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
	45	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
263b6c88 MD	46
	47	static inline
	48	void wrapper_vmalloc_sync_mappings(void)
	49	{
	50	void (*vmalloc_sync_mappings_sym)(void);
	51
	52	vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
	53	if (vmalloc_sync_mappings_sym) {
	54	vmalloc_sync_mappings_sym();
	55	} else {
	56	#ifdef CONFIG_X86
	57	/*
	58	* Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
	59	* trigger recursive page faults.
	60	*/
	61	printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
	62	printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
	63	#endif
	64	}
	65	}
	66
3dfec228 MJ	67	/*
	68	* Canary function to check for 'vmalloc_sync_mappings()' at compile time.
	69	*
	70	* From 'include/linux/vmalloc.h':
	71	*
	72	* void vmalloc_sync_mappings(void);
	73	*/
	74	static inline
	75	void __canary__vmalloc_sync_mappings(void)
	76	{
	77	vmalloc_sync_mappings();
	78	}
	79
1d618748	80	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88 MD	81
263b6c88 MD	82	/*
3dfec228	83	* Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6.
263b6c88	84	*/
6d2a620c	85	static inline
263b6c88	86	void wrapper_vmalloc_sync_mappings(void)
6d2a620c MD	87	{
	88	void (*vmalloc_sync_all_sym)(void);
	89
c539a324	90	vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all");
6d2a620c MD	91	if (vmalloc_sync_all_sym) {
	92	vmalloc_sync_all_sym();
	93	} else {
	94	#ifdef CONFIG_X86
	95	/*
	96	* Only x86 needs vmalloc_sync_all to make sure LTTng does not
	97	* trigger recursive page faults.
	98	*/
e36de50d MD	99	printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
e36de50d MD	100	printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
6d2a620c MD	101	#endif
	102	}
	103	}
263b6c88	104
3dfec228 MJ	105	/*
	106	* Canary function to check for 'vmalloc_sync_all()' at compile time.
	107	*
	108	* From 'include/linux/vmalloc.h':
	109	*
	110	* void vmalloc_sync_all(void);
	111	*/
	112	static inline
	113	void __canary__vmalloc_sync_all(void)
	114	{
	115	vmalloc_sync_all();
	116	}
	117
1d618748	118	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88	119
6d2a620c MD	120	#else
6d2a620c MD	121
2b3dbafc	122	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
9bfe744a	123	\|\| LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
2b3dbafc OP	124	\|\| LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
	125	\|\| LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
	126	\|\| LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
	127	\|\| LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
	128	\|\| LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
2e4c781e SB	129	\|\| LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
	130	\|\| LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \
	131	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
	132	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
263b6c88	133
6d2a620c	134	static inline
263b6c88 MD	135	void wrapper_vmalloc_sync_mappings(void)
	136	{
	137	return vmalloc_sync_mappings();
	138	}
	139
1d618748	140	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88 MD	141
	142	static inline
	143	void wrapper_vmalloc_sync_mappings(void)
6d2a620c MD	144	{
	145	return vmalloc_sync_all();
	146	}
263b6c88	147
1d618748	148	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88	149
6d2a620c	150	#endif
b13f3ebe	151
48f5e0b5 MJ	152	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
	153	static inline
	154	void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
	155	{
	156	void *ret;
	157
	158	ret = kvmalloc_node(size, flags, node);
	159	if (is_vmalloc_addr(ret)) {
	160	/*
	161	* Make sure we don't trigger recursive page faults in the
	162	* tracing fast path.
	163	*/
263b6c88	164	wrapper_vmalloc_sync_mappings();
48f5e0b5 MJ	165	}
	166	return ret;
	167	}
	168
	169	static inline
	170	void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
	171	{
	172	return lttng_kvmalloc_node(size, flags \| __GFP_ZERO, node);
	173	}
	174
	175	static inline
	176	void *lttng_kvmalloc(unsigned long size, gfp_t flags)
	177	{
	178	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
	179	}
	180
	181	static inline
	182	void *lttng_kvzalloc(unsigned long size, gfp_t flags)
	183	{
	184	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
	185	}
	186
	187	static inline
	188	void lttng_kvfree(const void *addr)
	189	{
	190	kvfree(addr);
	191	}
	192
	193	#else
	194
	195	#include <linux/slab.h>
48f5e0b5	196
20eb87c9 MD	197	static inline
	198	void print_vmalloc_node_range_warning(void)
	199	{
	200	printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n");
	201	printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n");
	202	printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
	203	}
	204
48f5e0b5 MJ	205	/*
	206	* kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
	207	*/
	208	static inline
20eb87c9 MD	209	void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	210	unsigned long start, unsigned long end, gfp_t gfp_mask,
	211	pgprot_t prot, unsigned long vm_flags, int node,
	212	const void *caller)
48f5e0b5	213	{
48f5e0b5 MJ	214	#ifdef CONFIG_KALLSYMS
48f5e0b5 MJ	215	/*
20eb87c9	216	* If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
48f5e0b5	217	*/
20eb87c9 MD	218	void (lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
	219	unsigned long start, unsigned long end, gfp_t gfp_mask,
	220	pgprot_t prot, unsigned long vm_flags, int node,
	221	const void *caller);
	222
	223	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	224	if (lttng__vmalloc_node_range)
	225	return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	226	vm_flags, node, caller);
48f5e0b5	227	#endif
20eb87c9 MD	228	if (node != NUMA_NO_NODE)
	229	print_vmalloc_node_range_warning();
	230	return __vmalloc(size, gfp_mask, prot);
48f5e0b5	231	}
3dfec228 MJ	232
	233	/*
	234	* Canary function to check for '__vmalloc_node_range()' at compile time.
	235	*
	236	* From 'include/linux/vmalloc.h':
	237	*
	238	* extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
	239	* unsigned long start, unsigned long end, gfp_t gfp_mask,
	240	* pgprot_t prot, unsigned long vm_flags, int node,
	241	* const void *caller);
	242	*/
	243	static inline
	244	void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	245	unsigned long start, unsigned long end, gfp_t gfp_mask,
	246	pgprot_t prot, unsigned long vm_flags, int node,
	247	const void *caller)
	248	{
	249	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	250	vm_flags, node, caller);
	251	}
48f5e0b5 MJ	252
	253	/**
	254	* lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
	255	* failure, fall back to non-contiguous (vmalloc) allocation.
	256	* @size: size of the request.
	257	* @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL.
	258	*
	259	* Uses kmalloc to get the memory but if the allocation fails then falls back
	260	* to the vmalloc allocator. Use lttng_kvfree to free the memory.
	261	*
	262	* Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported
	263	*/
	264	static inline
	265	void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
	266	{
	267	void *ret;
	268
	269	/*
	270	* vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
	271	* so the given set of flags has to be compatible.
	272	*/
	273	WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);
	274
	275	/*
	276	* If the allocation fits in a single page, do not fallback.
	277	*/
	278	if (size <= PAGE_SIZE) {
	279	return kmalloc_node(size, flags, node);
	280	}
	281
	282	/*
	283	* Make sure that larger requests are not too disruptive - no OOM
	284	* killer and no allocation failure warnings as we have a fallback
	285	*/
	286	ret = kmalloc_node(size, flags \| __GFP_NOWARN \| __GFP_NORETRY, node);
	287	if (!ret) {
20eb87c9 MD	288	ret = __lttng_vmalloc_node_range(size, 1,
	289	VMALLOC_START, VMALLOC_END,
	290	flags \| __GFP_HIGHMEM, PAGE_KERNEL, 0,
	291	node, __builtin_return_address(0));
48f5e0b5 MJ	292	/*
	293	* Make sure we don't trigger recursive page faults in the
	294	* tracing fast path.
	295	*/
f3e4ba5d	296	wrapper_vmalloc_sync_mappings();
48f5e0b5 MJ	297	}
	298	return ret;
	299	}
	300
	301	static inline
	302	void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
	303	{
	304	return lttng_kvmalloc_node(size, flags \| __GFP_ZERO, node);
	305	}
	306
	307	static inline
	308	void *lttng_kvmalloc(unsigned long size, gfp_t flags)
	309	{
	310	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
	311	}
	312
	313	static inline
	314	void *lttng_kvzalloc(unsigned long size, gfp_t flags)
	315	{
	316	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
	317	}
	318
	319	static inline
	320	void lttng_kvfree(const void *addr)
	321	{
	322	if (is_vmalloc_addr(addr)) {
	323	vfree(addr);
	324	} else {
	325	kfree(addr);
	326	}
	327	}
	328	#endif
	329
a90917c3	330	#endif /* _LTTNG_WRAPPER_VMALLOC_H */