[PATCH 1/8] lib: Introduce sgl_alloc() and sgl_free()

[Jens Axboe]

On 10/12/2017 04:45 PM, Bart Van Assche wrote:
> Many kernel drivers contain code that allocate and free both a
> scatterlist and the pages that populate that scatterlist.
> Introduce functions under lib/ that perform these tasks instead
> of duplicating this functionality in multiple drivers.
> 
> Signed-off-by: Bart Van Assche <bart.vanassche at wdc.com>
> ---
>  include/linux/sgl_alloc.h |  16 ++++++++
>  lib/Kconfig               |   4 ++
>  lib/Makefile              |   1 +
>  lib/sgl_alloc.c           | 102 ++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 123 insertions(+)
>  create mode 100644 include/linux/sgl_alloc.h
>  create mode 100644 lib/sgl_alloc.c
> 
> diff --git a/include/linux/sgl_alloc.h b/include/linux/sgl_alloc.h
> new file mode 100644
> index 000000000000..a0f719690c9e
> --- /dev/null
> +++ b/include/linux/sgl_alloc.h
> @@ -0,0 +1,16 @@
> +#ifndef _SGL_ALLOC_H_
> +#define _SGL_ALLOC_H_
> +
> +#include <linux/types.h> /* bool, gfp_t */
> +
> +struct scatterlist;
> +
> +struct scatterlist *sgl_alloc_order(unsigned long long length,
> +				    unsigned int order, unsigned int *nent_p,
> +				    gfp_t gfp, bool chainable);
> +struct scatterlist *sgl_alloc(unsigned long long length, unsigned int *nent_p,
> +			      gfp_t gfp);
> +void sgl_free_order(struct scatterlist *sgl, int order);
> +void sgl_free(struct scatterlist *sgl);
> +
> +#endif /* _SGL_ALLOC_H_ */

Should this just go into linux/scatterlist.h instead of creating a new header
file?

-- 
Jens Axboe