[PATCH] NVMe: add explicit BLK_DEV_INTEGRITY dependency

[PATCH] NVMe: add explicit BLK_DEV_INTEGRITY dependency

[Arnd Bergmann]

A patch that was added to 4.0-rc1 in the last minute caused a
build break in the NVMe driver unless integrity support is
also enabled:

drivers/block/nvme-core.c: In function 'nvme_dif_remap':
drivers/block/nvme-core.c:523:24: error: dereferencing pointer to incomplete type
  pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset;
                        ^
drivers/block/nvme-core.c:523:49: error: dereferencing pointer to incomplete type
  pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset;
                                                 ^

This changes the Kconfig entry for NVMe to depend on that
support, to avoid the build error. Using 'select' would work
as well, but might have unintended side-effects when users
do not actually want the integerity support.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: e1e5e5641e6f ("NVMe: Metadata format support")
---
Found on ARM randconfig builds

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 1b8094d4d7af..e386dd5b94e9 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -312,7 +312,7 @@ config BLK_DEV_NBD
 
 config BLK_DEV_NVME
 	tristate "NVM Express block device"
-	depends on PCI
+	depends on PCI && BLK_DEV_INTEGRITY
 	---help---
 	  The NVM Express driver is for solid state drives directly
 	  connected to the PCI or PCI Express bus.  If you know you

[PATCH] NVMe: add explicit BLK_DEV_INTEGRITY dependency

[Keith Busch]

On Mon, 23 Feb 2015, Arnd Bergmann wrote:
> A patch that was added to 4.0-rc1 in the last minute caused a
> build break in the NVMe driver unless integrity support is
> also enabled:
>
> drivers/block/nvme-core.c: In function 'nvme_dif_remap':
> drivers/block/nvme-core.c:523:24: error: dereferencing pointer to incomplete type
>  pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset;
>                        ^
> drivers/block/nvme-core.c:523:49: error: dereferencing pointer to incomplete type
>  pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset;
>                                                 ^
>
> This changes the Kconfig entry for NVMe to depend on that
> support, to avoid the build error. Using 'select' would work
> as well, but might have unintended side-effects when users
> do not actually want the integerity support.

Thanks for the catch. We do want users to be able to use this with and
without blk-integrity, so I'll send a patch using conditional functions
between appropriate ifdef's like how scsi and block handle this.