On Sat, 16 Oct 2010 12:33:31 +0800
Dave Young <hidave.darkstar@xxxxxxxxx> wrote:
> Add vzalloc for convinience of vmalloc-then-memset-zero case
>
> Use __GFP_ZERO in vzalloc to zero fill the allocated memory.
>
> Signed-off-by: Dave Young <hidave.darkstar@xxxxxxxxx>
> ---
> include/linux/vmalloc.h | 1 +
> mm/vmalloc.c | 13 +++++++++++++
> 2 files changed, 14 insertions(+)
>
> --- linux-2.6.orig/include/linux/vmalloc.h 2010-08-22 15:31:38.000000000 +0800
> +++ linux-2.6/include/linux/vmalloc.h 2010-10-16 10:50:54.739996121 +0800
> @@ -53,6 +53,7 @@ static inline void vmalloc_init(void)
> #endif
>
> extern void *vmalloc(unsigned long size);
> +extern void *vzalloc(unsigned long size);
> extern void *vmalloc_user(unsigned long size);
> extern void *vmalloc_node(unsigned long size, int node);
> extern void *vmalloc_exec(unsigned long size);
> --- linux-2.6.orig/mm/vmalloc.c 2010-08-22 15:31:39.000000000 +0800
> +++ linux-2.6/mm/vmalloc.c 2010-10-16 10:51:57.126665918 +0800
> @@ -1604,6 +1604,19 @@ void *vmalloc(unsigned long size)
> EXPORT_SYMBOL(vmalloc);
>
> /**
> + * vzalloc - allocate virtually contiguous memory with zero filled
s/filled/fill/
> + * @size: allocation size
> + * Allocate enough pages to cover @size from the page level
> + * allocator and map them into contiguous kernel virtual space.
> + */
> +void *vzalloc(unsigned long size)
> +{
> + return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
> + PAGE_KERNEL, -1, __builtin_return_address(0));
> +}
> +EXPORT_SYMBOL(vzalloc);
We'd need to add the same interface to nommu, please.
Also, a slightly better implementation would be
static inline void *__vmalloc_node_flags(unsigned long size, gfp_t flags)
{
return __vmalloc_node(size, 1, flags, PAGE_KERNEL, -1,
__builtin_return_address(0));
}
void *vzalloc(unsigned long size)
{
return __vmalloc_node_flags(size,
GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
}
void *vmalloc(unsigned long size)
{
return __vmalloc_node_flags(size, GFP_KERNEL | __GFP_HIGHMEM);
}
just to avoid code duplication (and possible later errors derived from it).
Perhaps it should be always_inline, so the __builtin_return_address()
can't get broken.
Or just leave it the way you had it :)
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