linux-kernel - [PATCH] block: add 'struct gendisk' declaration

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Date:   Fri, 29 May 2020 22:14:28 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Jens Axboe <axboe@...nel.dk>
Cc:     Arnd Bergmann <arnd@...db.de>, Christoph Hellwig <hch@....de>,
        Damien Le Moal <damien.lemoal@....com>,
        Bart Van Assche <bvanassche@....org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Ming Lei <ming.lei@...hat.com>,
        Ajay Joshi <ajay.joshi@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH] block: add 'struct gendisk' declaration

The added disk_start_io_acct() function declaration causes a warning
when CONFIG_BLOCK is disabled:

include/linux/blkdev.h:1895:41: error: declaration of 'struct gendisk' will not be visible outside of this function [-Werror,-Wvisibility]

Declare the struct tag before the function to suppress that warning.

Fixes: 956d510ee78c ("block: add disk/bio-based accounting helpers")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/blkdev.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 36568c9d030a..96cf7af86b73 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1892,6 +1892,7 @@ static inline void blk_wake_io_task(struct task_struct *waiter)
 		wake_up_process(waiter);
 }
 
+struct gendisk;
 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
 		unsigned int op);
 void disk_end_io_acct(struct gendisk *disk, unsigned int op,
-- 
2.26.2