zram: delete custom lzo/lz4

Remove lzo/lz4 backends, we use crypto API now.

[sergey.senozhatsky@gmail.com: zram-delete-custom-lzo-lz4-v3]
  Link: http://lkml.kernel.org/r/20160604024902.11778-6-sergey.senozhatsky@gmail.com
Link: http://lkml.kernel.org/r/20160531122017.2878-7-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 2 insertions, 174 deletions

diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index 2252cd7d0e89..b8ecba6dcd3b 100644
--- a/drivers/block/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
@@ -13,12 +13,3 @@ config ZRAM
           disks and maybe many more.
 
           See zram.txt for more information.
-
-config ZRAM_LZ4_COMPRESS
-        bool "Enable LZ4 algorithm support"
-        depends on ZRAM
-        select CRYPTO_LZ4
-        default n
-        help
-          This option enables LZ4 compression algorithm support. Compression
-          algorithm can be changed using `comp_algorithm' device attribute.
diff --git a/drivers/block/zram/Makefile b/drivers/block/zram/Makefile
index be0763ff57a2..9e2b79e9a990 100644
--- a/drivers/block/zram/Makefile
+++ b/drivers/block/zram/Makefile
@@ -1,5 +1,3 @@
-zram-y  :=      zcomp_lzo.o zcomp.o zram_drv.o
-
-zram-$(CONFIG_ZRAM_LZ4_COMPRESS) += zcomp_lz4.o
+zram-y  :=      zcomp.o zram_drv.o
 
 obj-$(CONFIG_ZRAM)      +=      zram.o
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index a2b4eb85b41d..9ab45d41624b 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -20,7 +20,7 @@
 
 static const char * const backends[] = {
         "lzo",
-#ifdef CONFIG_ZRAM_LZ4_COMPRESS
+#if IS_ENABLED(CONFIG_CRYPTO_LZ4)
         "lz4",
 #endif
         NULL
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index c914ab7972ef..478cac2ed465 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -16,24 +16,9 @@ struct zcomp_strm {
         struct crypto_comp *tfm;
 };
 
-/* static compression backend */
-struct zcomp_backend {
-        int (*compress)(const unsigned char *src, unsigned char *dst,
-                        size_t *dst_len, void *private);
-
-        int (*decompress)(const unsigned char *src, size_t src_len,
-                        unsigned char *dst);
-
-        void *(*create)(gfp_t flags);
-        void (*destroy)(void *private);
-
-        const char *name;
-};
-
 /* dynamic per-device compression frontend */
 struct zcomp {
         struct zcomp_strm * __percpu *stream;
-        struct zcomp_backend *backend;
         struct notifier_block notifier;
 
         const char *name;
diff --git a/drivers/block/zram/zcomp_lz4.c b/drivers/block/zram/zcomp_lz4.c
deleted file mode 100644
index 0110086accba..000000000000
--- a/drivers/block/zram/zcomp_lz4.c
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright (C) 2014 Sergey Senozhatsky.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/lz4.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-
-#include "zcomp_lz4.h"
-
-static void *zcomp_lz4_create(gfp_t flags)
-{
-        void *ret;
-
-        ret = kmalloc(LZ4_MEM_COMPRESS, flags);
-        if (!ret)
-                ret = __vmalloc(LZ4_MEM_COMPRESS,
-                                flags | __GFP_HIGHMEM,
-                                PAGE_KERNEL);
-        return ret;
-}
-
-static void zcomp_lz4_destroy(void *private)
-{
-        kvfree(private);
-}
-
-static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst,
-                size_t *dst_len, void *private)
-{
-        /* return  : Success if return 0 */
-        return lz4_compress(src, PAGE_SIZE, dst, dst_len, private);
-}
-
-static int zcomp_lz4_decompress(const unsigned char *src, size_t src_len,
-                unsigned char *dst)
-{
-        size_t dst_len = PAGE_SIZE;
-        /* return  : Success if return 0 */
-        return lz4_decompress_unknownoutputsize(src, src_len, dst, &dst_len);
-}
-
-struct zcomp_backend zcomp_lz4 = {
-        .compress = zcomp_lz4_compress,
-        .decompress = zcomp_lz4_decompress,
-        .create = zcomp_lz4_create,
-        .destroy = zcomp_lz4_destroy,
-        .name = "lz4",
-};
diff --git a/drivers/block/zram/zcomp_lz4.h b/drivers/block/zram/zcomp_lz4.h
deleted file mode 100644
index 60613fb29dd8..000000000000
--- a/drivers/block/zram/zcomp_lz4.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (C) 2014 Sergey Senozhatsky.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _ZCOMP_LZ4_H_
-#define _ZCOMP_LZ4_H_
-
-#include "zcomp.h"
-
-extern struct zcomp_backend zcomp_lz4;
-
-#endif /* _ZCOMP_LZ4_H_ */
diff --git a/drivers/block/zram/zcomp_lzo.c b/drivers/block/zram/zcomp_lzo.c
deleted file mode 100644
index ed7a1f0549ec..000000000000
--- a/drivers/block/zram/zcomp_lzo.c
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright (C) 2014 Sergey Senozhatsky.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/lzo.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-
-#include "zcomp_lzo.h"
-
-static void *lzo_create(gfp_t flags)
-{
-        void *ret;
-
-        ret = kmalloc(LZO1X_MEM_COMPRESS, flags);
-        if (!ret)
-                ret = __vmalloc(LZO1X_MEM_COMPRESS,
-                                flags | __GFP_HIGHMEM,
-                                PAGE_KERNEL);
-        return ret;
-}
-
-static void lzo_destroy(void *private)
-{
-        kvfree(private);
-}
-
-static int lzo_compress(const unsigned char *src, unsigned char *dst,
-                size_t *dst_len, void *private)
-{
-        int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private);
-        return ret == LZO_E_OK ? 0 : ret;
-}
-
-static int lzo_decompress(const unsigned char *src, size_t src_len,
-                unsigned char *dst)
-{
-        size_t dst_len = PAGE_SIZE;
-        int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
-        return ret == LZO_E_OK ? 0 : ret;
-}
-
-struct zcomp_backend zcomp_lzo = {
-        .compress = lzo_compress,
-        .decompress = lzo_decompress,
-        .create = lzo_create,
-        .destroy = lzo_destroy,
-        .name = "lzo",
-};
diff --git a/drivers/block/zram/zcomp_lzo.h b/drivers/block/zram/zcomp_lzo.h
deleted file mode 100644
index 128c5807fa14..000000000000
--- a/drivers/block/zram/zcomp_lzo.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (C) 2014 Sergey Senozhatsky.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _ZCOMP_LZO_H_
-#define _ZCOMP_LZO_H_
-
-#include "zcomp.h"
-
-extern struct zcomp_backend zcomp_lzo;
-
-#endif /* _ZCOMP_LZO_H_ */