We allow configurations with CONFIG_BLOCK=n and CONFIG_DAX=y, which now
results in a link error:
drivers/dax/super.c: In function 'bdev_dax_pgoff':
drivers/dax/super.c:50:26: error: implicit declaration of function 'get_start_sect'; did you mean 'get_task_cred'? [-Werror=implicit-function-declaration]
The two obvious ways to avoid the link error are to either add an #ifdef
around the code that was moved from fs/block_dev.c, or to disallow the
configuration. I could not see if there is or is not a reason to support
this combination of options, but in case there is, the #ifdef is the
safer choice.
Fixes: ef51042472f5 ("block, dax: move "select DAX" from BLOCK to FS_DAX")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/dax/super.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index ebf43f531ada..6ed32aac8bbe 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -44,6 +44,7 @@ void dax_read_unlock(int id)
}
EXPORT_SYMBOL_GPL(dax_read_unlock);
+#ifdef CONFIG_BLOCK
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
@@ -112,6 +113,7 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize)
return 0;
}
EXPORT_SYMBOL_GPL(__bdev_dax_supported);
+#endif
/**
* struct dax_device - anchor object for dax services
--
2.9.0
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