[PATCH 1/8] Allow sharing xvmalloc for zram and zcache

[Nitin Gupta <ngupta@vflare.org>]

Both zram and zcache use xvmalloc allocator. If xvmalloc
is compiled separately for both of them, we will get linker
error if they are both selected as "built-in".

So, we now compile xvmalloc separately and export its symbols
which are then used by both of zram and zcache.

Signed-off-by: Nitin Gupta <ngupta@vflare.org>
---
 drivers/staging/Makefile        |    1 +
 drivers/staging/zram/Kconfig    |    5 +++++
 drivers/staging/zram/Makefile   |    3 ++-
 drivers/staging/zram/xvmalloc.c |    8 ++++++++
 4 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 63baeee..6de8564 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_MRST_RAR_HANDLER)	+= memrar/
 obj-$(CONFIG_DX_SEP)		+= sep/
 obj-$(CONFIG_IIO)		+= iio/
 obj-$(CONFIG_ZRAM)		+= zram/
+obj-$(CONFIG_XVMALLOC)		+= zram/
 obj-$(CONFIG_WLAGS49_H2)	+= wlags49_h2/
 obj-$(CONFIG_WLAGS49_H25)	+= wlags49_h25/
 obj-$(CONFIG_BATMAN_ADV)	+= batman-adv/
diff --git a/drivers/staging/zram/Kconfig b/drivers/staging/zram/Kconfig
index 4654ae2..9bf26ce 100644
--- a/drivers/staging/zram/Kconfig
+++ b/drivers/staging/zram/Kconfig
@@ -1,6 +1,11 @@
+config XVMALLOC
+	bool
+	default n
+
 config ZRAM
 	tristate "Compressed RAM block device support"
 	depends on BLOCK
+	select XVMALLOC
 	select LZO_COMPRESS
 	select LZO_DECOMPRESS
 	default n
diff --git a/drivers/staging/zram/Makefile b/drivers/staging/zram/Makefile
index b2c087a..9900f8b 100644
--- a/drivers/staging/zram/Makefile
+++ b/drivers/staging/zram/Makefile
@@ -1,3 +1,4 @@
-zram-objs	:=	zram_drv.o xvmalloc.o
+zram-objs	:=	zram_drv.o
 
 obj-$(CONFIG_ZRAM)	+=	zram.o
+obj-$(CONFIG_XVMALLOC)	+=	xvmalloc.o
diff --git a/drivers/staging/zram/xvmalloc.c b/drivers/staging/zram/xvmalloc.c
index 3fdbb8a..3f94ef5 100644
--- a/drivers/staging/zram/xvmalloc.c
+++ b/drivers/staging/zram/xvmalloc.c
@@ -10,6 +10,8 @@
  * Released under the terms of GNU General Public License Version 2.0
  */
 
+#include <linux/module.h>
+#include <linux/kernel.h>
 #include <linux/bitops.h>
 #include <linux/errno.h>
 #include <linux/highmem.h>
@@ -320,11 +322,13 @@ struct xv_pool *xv_create_pool(void)
 
 	return pool;
 }
+EXPORT_SYMBOL_GPL(xv_create_pool);
 
 void xv_destroy_pool(struct xv_pool *pool)
 {
 	kfree(pool);
 }
+EXPORT_SYMBOL_GPL(xv_destroy_pool);
 
 /**
  * xv_malloc - Allocate block of given size from pool.
@@ -413,6 +417,7 @@ int xv_malloc(struct xv_pool *pool, u32 size, struct page **page,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xv_malloc);
 
 /*
  * Free block identified with <page, offset>
@@ -489,6 +494,7 @@ void xv_free(struct xv_pool *pool, struct page *page, u32 offset)
 	put_ptr_atomic(page_start, KM_USER0);
 	spin_unlock(&pool->lock);
 }
+EXPORT_SYMBOL_GPL(xv_free);
 
 u32 xv_get_object_size(void *obj)
 {
@@ -497,6 +503,7 @@ u32 xv_get_object_size(void *obj)
 	blk = (struct block_header *)((char *)(obj) - XV_ALIGN);
 	return blk->size;
 }
+EXPORT_SYMBOL_GPL(xv_get_object_size);
 
 /*
  * Returns total memory used by allocator (userdata + metadata)
@@ -505,3 +512,4 @@ u64 xv_get_total_size_bytes(struct xv_pool *pool)
 {
 	return pool->total_pages << PAGE_SHIFT;
 }
+EXPORT_SYMBOL_GPL(xv_get_total_size_bytes);
-- 
1.7.1.1

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