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Date:   Tue, 10 Aug 2021 14:58:13 +0200
From:   Christoph Hellwig <>
To:     Stephen Rothwell <>,
        Jens Axboe <>
Cc:     Linux Kernel Mailing List <>,
        Linux Next Mailing List <>
Subject: Re: linux-next: build failure after merge of the block tree

The patch below fixes it.

>From 28be8f9a9da95d54b7fce80332bf2c62abfcdf73 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <>
Date: Tue, 10 Aug 2021 14:39:24 +0200
Subject: writeback: make the laptop_mode prototypes available unconditionally

Fix the !CONFIG_BLOCK build after the recent cleanup.

Fixes: 5ed964f8e54e ("mm: hide laptop_mode_wb_timer entirely behind the BDI API")
Reported-by: Stephen Rothwell <>
Signed-off-by: Christoph Hellwig <>
 include/linux/writeback.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 667e86cfbdcf..270677dc4f36 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -336,14 +336,9 @@ static inline void cgroup_writeback_umount(void)
  * mm/page-writeback.c
 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(struct timer_list *t);
-static inline void laptop_sync_completion(void) { }
 bool node_dirty_ok(struct pglist_data *pgdat);
 int wb_domain_init(struct wb_domain *dom, gfp_t gfp);

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