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Date: Tue, 23 Jan 2018 13:55:22 +0300
From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To: Dave Hansen <dave.hansen@...el.com>, linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
Andy Lutomirski <luto@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 1/4] vmalloc: add vm_flags argument to internal
__vmalloc_node()
This allows to set VM_USERMAP in vmalloc_user() and vmalloc_32_user()
directly at allocation and avoid find_vm_area() call.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
---
mm/vmalloc.c | 54 +++++++++++++++++++++---------------------------------
1 file changed, 21 insertions(+), 33 deletions(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 673942094328..cece3fb33cef 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1662,7 +1662,9 @@ EXPORT_SYMBOL(vmap);
static void *__vmalloc_node(unsigned long size, unsigned long align,
gfp_t gfp_mask, pgprot_t prot,
+ unsigned long vm_flags,
int node, const void *caller);
+
static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
pgprot_t prot, int node)
{
@@ -1681,7 +1683,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
/* Please note that the recursion is strictly bounded. */
if (array_size > PAGE_SIZE) {
pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask,
- PAGE_KERNEL, node, area->caller);
+ PAGE_KERNEL, 0, node, area->caller);
} else {
pages = kmalloc_node(array_size, nested_gfp, node);
}
@@ -1752,7 +1754,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
goto fail;
area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED |
- vm_flags, start, end, node, gfp_mask, caller);
+ vm_flags, start, end, node, gfp_mask, caller);
if (!area)
goto fail;
@@ -1783,6 +1785,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
* @align: desired alignment
* @gfp_mask: flags for the page level allocator
* @prot: protection mask for the allocated pages
+ * @vm_flags: additional vm area flags (e.g. %VM_NO_GUARD)
* @node: node to use for allocation or NUMA_NO_NODE
* @caller: caller's return address
*
@@ -1799,15 +1802,16 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
*/
static void *__vmalloc_node(unsigned long size, unsigned long align,
gfp_t gfp_mask, pgprot_t prot,
+ unsigned long vm_flags,
int node, const void *caller)
{
return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
- gfp_mask, prot, 0, node, caller);
+ gfp_mask, prot, vm_flags, node, caller);
}
void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
{
- return __vmalloc_node(size, 1, gfp_mask, prot, NUMA_NO_NODE,
+ return __vmalloc_node(size, 1, gfp_mask, prot, 0, NUMA_NO_NODE,
__builtin_return_address(0));
}
EXPORT_SYMBOL(__vmalloc);
@@ -1815,15 +1819,15 @@ EXPORT_SYMBOL(__vmalloc);
static inline void *__vmalloc_node_flags(unsigned long size,
int node, gfp_t flags)
{
- return __vmalloc_node(size, 1, flags, PAGE_KERNEL,
- node, __builtin_return_address(0));
+ return __vmalloc_node(size, 1, flags, PAGE_KERNEL, 0, node,
+ __builtin_return_address(0));
}
void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags,
void *caller)
{
- return __vmalloc_node(size, 1, flags, PAGE_KERNEL, node, caller);
+ return __vmalloc_node(size, 1, flags, PAGE_KERNEL, 0, node, caller);
}
/**
@@ -1868,18 +1872,9 @@ EXPORT_SYMBOL(vzalloc);
*/
void *vmalloc_user(unsigned long size)
{
- struct vm_struct *area;
- void *ret;
-
- ret = __vmalloc_node(size, SHMLBA,
- GFP_KERNEL | __GFP_ZERO,
- PAGE_KERNEL, NUMA_NO_NODE,
- __builtin_return_address(0));
- if (ret) {
- area = find_vm_area(ret);
- area->flags |= VM_USERMAP;
- }
- return ret;
+ return __vmalloc_node(size, SHMLBA, GFP_KERNEL | __GFP_ZERO,
+ PAGE_KERNEL, VM_USERMAP, NUMA_NO_NODE,
+ __builtin_return_address(0));
}
EXPORT_SYMBOL(vmalloc_user);
@@ -1896,8 +1891,8 @@ EXPORT_SYMBOL(vmalloc_user);
*/
void *vmalloc_node(unsigned long size, int node)
{
- return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL,
- node, __builtin_return_address(0));
+ return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL, 0, node,
+ __builtin_return_address(0));
}
EXPORT_SYMBOL(vmalloc_node);
@@ -1938,7 +1933,7 @@ EXPORT_SYMBOL(vzalloc_node);
void *vmalloc_exec(unsigned long size)
{
- return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL_EXEC,
+ return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL_EXEC, 0,
NUMA_NO_NODE, __builtin_return_address(0));
}
@@ -1959,7 +1954,7 @@ void *vmalloc_exec(unsigned long size)
*/
void *vmalloc_32(unsigned long size)
{
- return __vmalloc_node(size, 1, GFP_VMALLOC32, PAGE_KERNEL,
+ return __vmalloc_node(size, 1, GFP_VMALLOC32, PAGE_KERNEL, 0,
NUMA_NO_NODE, __builtin_return_address(0));
}
EXPORT_SYMBOL(vmalloc_32);
@@ -1973,16 +1968,9 @@ EXPORT_SYMBOL(vmalloc_32);
*/
void *vmalloc_32_user(unsigned long size)
{
- struct vm_struct *area;
- void *ret;
-
- ret = __vmalloc_node(size, 1, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL,
- NUMA_NO_NODE, __builtin_return_address(0));
- if (ret) {
- area = find_vm_area(ret);
- area->flags |= VM_USERMAP;
- }
- return ret;
+ return __vmalloc_node(size, 1, GFP_VMALLOC32 | __GFP_ZERO,
+ PAGE_KERNEL, VM_USERMAP, NUMA_NO_NODE,
+ __builtin_return_address(0));
}
EXPORT_SYMBOL(vmalloc_32_user);
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