Messages in this thread Patch in this message | | | Date | Sun, 06 Mar 2005 21:56:35 +0300 | From | Oleg Nesterov <> | Subject | [PATCH 1/5] vmalloc: introduce __vmalloc_area() function |
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There are 3 copy-and-paste implementations of __vmalloc() in arch/{arm,sparc64,x86_64}/kernel/module.c.
I believe the only reason is that __vmalloc() doesn't allow to specify parameters of __get_vm_area().
This patch splits __vmalloc() into 2 functions. The new one, __vmalloc_area(), can be used as follows:
vm_struct *area = __get_vm_area(...); void *addr = __vmalloc_area(area, gfp, prot);
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- 2.6.11/include/linux/0_vmalloc.h 2005-01-12 15:07:10.000000000 +0300 +++ 2.6.11/include/linux/vmalloc.h 2005-03-06 19:39:05.000000000 +0300 @@ -27,6 +27,7 @@ extern void *vmalloc(unsigned long size) extern void *vmalloc_exec(unsigned long size); extern void *vmalloc_32(unsigned long size); extern void *__vmalloc(unsigned long size, int gfp_mask, pgprot_t prot); +extern void *__vmalloc_area(struct vm_struct *area, int gfp_mask, pgprot_t prot); extern void vfree(void *addr); extern void *vmap(struct page **pages, unsigned int count, --- 2.6.11/mm/0_vmalloc.c 2005-02-24 22:15:03.000000000 +0300 +++ 2.6.11/mm/vmalloc.c 2005-03-06 20:31:01.000000000 +0300 @@ -456,32 +456,12 @@ void *vmap(struct page **pages, unsigned EXPORT_SYMBOL(vmap); -/** - * __vmalloc - allocate virtually contiguous memory - * - * @size: allocation size - * @gfp_mask: flags for the page level allocator - * @prot: protection mask for the allocated pages - * - * 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(unsigned long size, int gfp_mask, pgprot_t prot) +void *__vmalloc_area(struct vm_struct *area, int gfp_mask, pgprot_t prot) { - struct vm_struct *area; struct page **pages; unsigned int nr_pages, array_size, i; - size = PAGE_ALIGN(size); - if (!size || (size >> PAGE_SHIFT) > num_physpages) - return NULL; - - area = get_vm_area(size, VM_ALLOC); - if (!area) - return NULL; - - nr_pages = size >> PAGE_SHIFT; + nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT; array_size = (nr_pages * sizeof(struct page *)); area->nr_pages = nr_pages; @@ -506,7 +486,7 @@ void *__vmalloc(unsigned long size, int goto fail; } } - + if (map_vm_area(area, prot, &pages)) goto fail; return area->addr; @@ -516,6 +496,32 @@ fail: return NULL; } +/** + * __vmalloc - allocate virtually contiguous memory + * + * @size: allocation size + * @gfp_mask: flags for the page level allocator + * @prot: protection mask for the allocated pages + * + * 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(unsigned long size, int gfp_mask, pgprot_t prot) +{ + struct vm_struct *area; + + size = PAGE_ALIGN(size); + if (!size || (size >> PAGE_SHIFT) > num_physpages) + return NULL; + + area = get_vm_area(size, VM_ALLOC); + if (!area) + return NULL; + + return __vmalloc_area(area, gfp_mask, prot); +} + EXPORT_SYMBOL(__vmalloc); /** - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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