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mm: unify module_alloc code for vmalloc

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Four architectures (arm, mips, sparc, x86) use __vmalloc_area() for
module_init().  Much of the code is duplicated and can be generalized in a
globally accessible function, __vmalloc_node_range().

__vmalloc_node() now calls into __vmalloc_node_range() with a range of
[VMALLOC_START, VMALLOC_END) for functionally equivalent behavior.

Each architecture may then use __vmalloc_node_range() directly to remove
the duplication of code.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2011-01-13 15:46:02 -08:00 • committed by Linus Torvalds
parent ec3f64fc9c
commit d0a21265df
6 changed files with 53 additions and 75 deletions
Download patch file Download diff file Expand all files Collapse all files

64
mm/vmalloc.c
View file

@ -1530,17 +1530,47 @@ fail:
return NULL;
}
void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
/**
* __vmalloc_node_range - allocate virtually contiguous memory
* @size: allocation size
* @align: desired alignment
* @start: vm area range start
* @end: vm area range end
* @gfp_mask: flags for the page level allocator
* @prot: protection mask for the allocated pages
* @node: node to use for allocation or -1
* @caller: caller's return address
*
* Allocate enough pages to cover @size from the page level
* allocator with @gfp_mask flags. Map them into contiguous
* kernel virtual space, using a pagetable protection of @prot.
*/
void *__vmalloc_node_range(unsigned long size, unsigned long align,
unsigned long start, unsigned long end, gfp_t gfp_mask,
pgprot_t prot, int node, void *caller)
{
void *addr = __vmalloc_area_node(area, gfp_mask, prot, -1,
__builtin_return_address(0));
struct vm_struct *area;
void *addr;
unsigned long real_size = size;
size = PAGE_ALIGN(size);
if (!size || (size >> PAGE_SHIFT) > totalram_pages)
return NULL;
area = __get_vm_area_node(size, align, VM_ALLOC, start, end, node,
gfp_mask, caller);
if (!area)
return NULL;
addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
/*
* A ref_count = 3 is needed because the vm_struct and vmap_area
* structures allocated in the __get_vm_area_node() function contain
* references to the virtual address of the vmalloc'ed block.
*/
kmemleak_alloc(addr, area->size - PAGE_SIZE, 3, gfp_mask);
kmemleak_alloc(addr, real_size, 3, gfp_mask);
return addr;
}
@ -1562,30 +1592,8 @@ static void *__vmalloc_node(unsigned long size, unsigned long align,
gfp_t gfp_mask, pgprot_t prot,
int node, void *caller)
{
struct vm_struct *area;
void *addr;
unsigned long real_size = size;
size = PAGE_ALIGN(size);
if (!size || (size >> PAGE_SHIFT) > totalram_pages)
return NULL;
area = __get_vm_area_node(size, align, VM_ALLOC, VMALLOC_START,
VMALLOC_END, node, gfp_mask, caller);
if (!area)
return NULL;
addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
/*
* A ref_count = 3 is needed because the vm_struct and vmap_area
* structures allocated in the __get_vm_area_node() function contain
* references to the virtual address of the vmalloc'ed block.
*/
kmemleak_alloc(addr, real_size, 3, gfp_mask);
return addr;
return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
gfp_mask, prot, node, caller);
}
void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)