From: Arnd Bergmann <arnd@arndb.de>

A recent patch introduced a call to devm_cxl_probe_mem(), which is only
available when CXL_MEM is enabled. If CXL_MEM is in a loadable module,
this causes a link failure for a builtin driver:

s390-linux-ld: drivers/net/ethernet/sfc/efx_cxl.o: in function `efx_cxl_init':
efx_cxl.c:(.text+0x156): undefined reference to `devm_cxl_probe_mem'

Adapt the dependency to require CXL_MEM instead of CXL_BUS, which
we know is available when CXL_MEM is.

Fixes: 0418860ef2ca ("sfc: obtain and map cxl range using devm_cxl_probe_mem")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/ethernet/sfc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig
index 979f2801e2a8..e2898ec2e6e9 100644
--- a/drivers/net/ethernet/sfc/Kconfig
+++ b/drivers/net/ethernet/sfc/Kconfig
@@ -68,7 +68,7 @@ config SFC_MCDI_LOGGING
 	  a sysfs file 'mcdi_logging' under the PCI device.
 config SFC_CXL
 	bool "Solarflare SFC9100-family CXL support"
-	depends on SFC && CXL_BUS >= SFC
+	depends on SFC && CXL_MEM >= SFC
 	default SFC
 	help
 	  This enables SFC CXL support if the kernel is configuring CXL for
-- 
2.53.0

On 17/09/2026 16:55, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> A recent patch introduced a call to devm_cxl_probe_mem(), which is only
> available when CXL_MEM is enabled. If CXL_MEM is in a loadable module,
> this causes a link failure for a builtin driver:
>
> s390-linux-ld: drivers/net/ethernet/sfc/efx_cxl.o: in function `efx_cxl_init':
> efx_cxl.c:(.text+0x156): undefined reference to `devm_cxl_probe_mem'
>
> Adapt the dependency to require CXL_MEM instead of CXL_BUS, which
> we know is available when CXL_MEM is.
>
> Fixes: 0418860ef2ca ("sfc: obtain and map cxl range using devm_cxl_probe_mem")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   drivers/net/ethernet/sfc/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig
> index 979f2801e2a8..e2898ec2e6e9 100644
> --- a/drivers/net/ethernet/sfc/Kconfig
> +++ b/drivers/net/ethernet/sfc/Kconfig
> @@ -68,7 +68,7 @@ config SFC_MCDI_LOGGING
>   	  a sysfs file 'mcdi_logging' under the PCI device.
>   config SFC_CXL
>   	bool "Solarflare SFC9100-family CXL support"
> -	depends on SFC && CXL_BUS >= SFC
> +	depends on SFC && CXL_MEM >= SFC
>   	default SFC
>   	help
>   	  This enables SFC CXL support if the kernel is configuring CXL for


Reviewed-by: Alejandro Lucero <alucerop@amd.com>