writeback: get rid of pdflush completely

It is now unused, so kill it off.

Signed-off-by: Jens Axboe <[email protected]>

fs/fs-writeback.c

@@ -29,6 +29,11 @@
 
 #define inode_to_bdi(inode)	((inode)->i_mapping->backing_dev_info)
 
+/*
+ * We don't actually have pdflush, but this one is exported though /proc...
+ */
+int nr_pdflush_threads;
+
 /*
  * Work items for the bdi_writeback threads
  */

include/linux/writeback.h

@@ -13,17 +13,6 @@ extern spinlock_t inode_lock;
 extern struct list_head inode_in_use;
 extern struct list_head inode_unused;
 
-/*
- * Yes, writeback.h requires sched.h
- * No, sched.h is not included from here.
- */
-static inline int task_is_pdflush(struct task_struct *task)
-{
-	return task->flags & PF_FLUSHER;
-}
-
-#define current_is_pdflush()	task_is_pdflush(current)
-
 /*
  * fs/fs-writeback.c
  */
@@ -155,7 +144,6 @@ balance_dirty_pages_ratelimited(struct address_space *mapping)
 typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
 				void *data);
 
-int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
 int generic_writepages(struct address_space *mapping,
 		       struct writeback_control *wbc);
 int write_cache_pages(struct address_space *mapping,

mm/Makefile

@@ -8,7 +8,7 @@ mmu-$(CONFIG_MMU)	:= fremap.o highmem.o madvise.o memory.o mincore.o \
 			   vmalloc.o
 
 obj-y			:= bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
-			   maccess.o page_alloc.o page-writeback.o pdflush.o \
+			   maccess.o page_alloc.o page-writeback.o \
 			   readahead.o swap.o truncate.o vmscan.o shmem.o \
 			   prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
 			   page_isolation.o mm_init.o $(mmu-y)