On (09/18/15 14:19), Joonsoo Kim wrote:
[..]
> + /*
> + * Prepare to use crypto decompress_noctx API. One tfm is required
> + * to initialize crypto algorithm properly and fetch corresponding
> + * function pointer. But, it is sharable for multiple concurrent
> + * decompress users.
> + */
if comp algorithm require zstrm for both compression and decompression,
then there seems to be no need in allocating sharable ->tfm_noctx, we
will never use it.
-ss
> + tfm = crypto_alloc_comp_noctx(compress, 0, 0);
> + if (!IS_ERR(tfm))
> + comp->tfm_noctx = tfm;
> +
> return comp;
> }
> diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
> index 4f9df8e..c76d8e4 100644
> --- a/drivers/block/zram/zcomp.h
> +++ b/drivers/block/zram/zcomp.h
> @@ -26,6 +26,7 @@ struct zcomp_strm {
> /* dynamic per-device compression frontend */
> struct zcomp {
> void *stream;
> + struct crypto_comp *tfm_noctx;
> const char *backend;
>
> struct zcomp_strm *(*strm_find)(struct zcomp *comp);
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