[PATCH 0/2] powerpc: pseries: making bus_type structures const

[PATCH 0/2] powerpc: pseries: making bus_type structures const

[Adrian Barnaś]

Current driver core properly handle constant bus_type structures.
Both changes are moving bus_type structures to be constant.
It is a part of tree clean-up from non const bus_type structures

Adrian Barnaś (2):
  powerpc: pseries: make suspend_subsys const
  powerpc: pseries: make cmm_subsys const

 arch/powerpc/platforms/pseries/cmm.c     | 2 +-
 arch/powerpc/platforms/pseries/suspend.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

-- 
2.51.0.470.ga7dc726c21-goog

[PATCH 1/2] powerpc: pseries: make suspend_subsys const

[Adrian Barnaś]

Because driver core can properly handle constant struct bus_type,
move the suspend_subsys to be a constant structure as well, placing it into
read-only memory which can not be modified at runtime.

Signed-off-by: Adrian Barnaś <abarnas@google.com>
---
 arch/powerpc/platforms/pseries/suspend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/suspend.c b/arch/powerpc/platforms/pseries/suspend.c
index 382003dfdb9a..c51db63d3e88 100644
--- a/arch/powerpc/platforms/pseries/suspend.c
+++ b/arch/powerpc/platforms/pseries/suspend.c
@@ -126,7 +126,7 @@ static ssize_t show_hibernate(struct device *dev,
 
 static DEVICE_ATTR(hibernate, 0644, show_hibernate, store_hibernate);
 
-static struct bus_type suspend_subsys = {
+static const struct bus_type suspend_subsys = {
 	.name = "power",
 	.dev_name = "power",
 };
-- 
2.51.0.470.ga7dc726c21-goog

[PATCH 2/2] powerpc: pseries: make cmm_subsys const

[Adrian Barnaś]

Because driver core can properly handle constant struct bus_type,
move the cmm_subsys to be a constant structure as well, placing it into
read-only memory which can not be modified at runtime.

Signed-off-by: Adrian Barnaś <abarnas@google.com>
---
 arch/powerpc/platforms/pseries/cmm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 5e0a718d1be7..913642647fe9 100644
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -375,7 +375,7 @@ static struct device_attribute *cmm_attrs[] = {
 static DEVICE_ULONG_ATTR(simulate_loan_target_kb, 0644,
 			 simulate_loan_target_kb);
 
-static struct bus_type cmm_subsys = {
+static const struct bus_type cmm_subsys = {
 	.name = "cmm",
 	.dev_name = "cmm",
 };
-- 
2.51.0.470.ga7dc726c21-goog

Re: [PATCH 0/2] powerpc: pseries: making bus_type structures const

[Greg Kroah-Hartman]

On Thu, Sep 18, 2025 at 02:08:14PM +0000, Adrian Barnaś wrote:
> Current driver core properly handle constant bus_type structures.
> Both changes are moving bus_type structures to be constant.
> It is a part of tree clean-up from non const bus_type structures
> 
> Adrian Barnaś (2):
>   powerpc: pseries: make suspend_subsys const
>   powerpc: pseries: make cmm_subsys const
> 
>  arch/powerpc/platforms/pseries/cmm.c     | 2 +-
>  arch/powerpc/platforms/pseries/suspend.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> -- 
> 2.51.0.470.ga7dc726c21-goog
> 

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>