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writeback: fix problem with !CONFIG_BLOCK compilation

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When CONFIG_BLOCK isn't enabled:

mm/page-writeback.c: In function 'laptop_mode_timer_fn':
mm/page-writeback.c:708: error: dereferencing pointer to incomplete type
mm/page-writeback.c:709: error: dereferencing pointer to incomplete type

Fix this by essentially eliminating the laptop sync handlers when
CONFIG_BLOCK isn't set, as most are only used from the block layer code.
The exception is laptop_sync_completion() which is used from sys_sync(),
make that an empty declaration in that case.

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2010-05-20 09:18:47 +02:00
parent b403a98e26
commit c2c4986edd
3 changed files with 7 additions and 0 deletions
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1
fs/super.c
View File

@ -37,6 +37,7 @@
#include <linux/kobject.h>
#include <linux/mutex.h>
#include <linux/file.h>
#include <linux/backing-dev.h>
#include <asm/uaccess.h>
#include "internal.h"

4
include/linux/writeback.h
View File

@ -106,10 +106,14 @@ static inline void inode_sync_wait(struct inode *inode)
/*
* mm/page-writeback.c
*/
#ifdef CONFIG_BLOCK
void laptop_io_completion(struct backing_dev_info *info);
void laptop_sync_completion(void);
void laptop_mode_sync(struct work_struct *work);
void laptop_mode_timer_fn(unsigned long data);
#else
static inline void laptop_sync_completion(void) { }
#endif
void throttle_vm_writeout(gfp_t gfp_mask);
/* These are exported to sysctl. */

2
mm/page-writeback.c
View File

@ -694,6 +694,7 @@ int dirty_writeback_centisecs_handler(ctl_table *table, int write,
return 0;
}
#ifdef CONFIG_BLOCK
void laptop_mode_timer_fn(unsigned long data)
{
struct request_queue *q = (struct request_queue *)data;
@ -735,6 +736,7 @@ void laptop_sync_completion(void)
rcu_read_unlock();
}
#endif
/*
* If ratelimit_pages is too high then we can get into dirty-data overload