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Message-ID: <20250328193826.356257-4-jmeneghi@redhat.com>
Date: Fri, 28 Mar 2025 15:38:24 -0400
From: John Meneghini <jmeneghi@...hat.com>
To: kbusch@...nel.org,
hch@....de,
sagi@...mberg.me
Cc: loberman@...hat.com,
linux-nvme@...ts.infradead.org,
linux-kernel@...r.kernel.org,
emilne@...hat.com,
jmeneghi@...hat.com,
bgurney@...hat.com
Subject: [PATCH v3 3/5] nvme: add the NVME_ENABLE_MULTIPATH_PARAM config option
The CONFIG_NVME_ENABLE_MULTIPATH_PARAM option controls the
core_nvme.multipath parameter. When CONFIG_NVME_ENABLE_MULTIPATH_PARAM=n
the multipath parameter is removed from the kernel and nvme multipathing
is permanently enabled. When CONFIG_NVME_ENABLE_MULTIPATH_PARAM=y the
nvme multipath parameter is added to the kernel and nvme multipath
support is controlled by the core_nvme.multipath parameter.
By default CONFIG_NVME_ENABLE_MULTIPATH_PARAM=y
Signed-off-by: John Meneghini <jmeneghi@...hat.com>
Tested-by: John Meneghini <jmeneghi@...hat.com>
Reviewed-by: Bryan Gurney <bgurney@...hat.com>
---
drivers/nvme/host/Kconfig | 11 +++++++++++
drivers/nvme/host/multipath.c | 2 ++
2 files changed, 13 insertions(+)
diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
index d47dfa80fb95..8c04b6b93982 100644
--- a/drivers/nvme/host/Kconfig
+++ b/drivers/nvme/host/Kconfig
@@ -28,6 +28,17 @@ config NVME_MULTIPATH
If unsure, say Y.
+config NVME_ENABLE_MULTIPATH_PARAM
+ bool "NVMe enable multipath param"
+ depends on NVME_CORE && NVME_MULTIPATH
+ default y
+ help
+ This option enables the core_nvme.multipath parameter.
+ If this option is disabled the core_nvme.multipath parameter
+ is excluded from the kernel.
+
+ If unsure, say Y.
+
config NVME_VERBOSE_ERRORS
bool "NVMe verbose error reporting"
depends on NVME_CORE
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 6b12ca80aa27..83084093e8db 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -10,9 +10,11 @@
#include "nvme.h"
bool multipath = true;
+#ifdef CONFIG_NVME_ENABLE_MULTIPATH_PARAM
module_param(multipath, bool, 0444);
MODULE_PARM_DESC(multipath,
"turn on native support for multiple controllers per subsystem");
+#endif
static const char *nvme_iopolicy_names[] = {
[NVME_IOPOLICY_NUMA] = "numa",
--
2.48.1
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