[PATCH 0/4] powerpc: struct bus_type cleanup

[PATCH 0/4] powerpc: struct bus_type cleanup

[Ricardo B. Marliere]

This series is part of an effort to cleanup the users of the driver
core, as can be seen in many recent patches authored by Greg across the
tree (e.g. [1]). Specifically, this series is part of the task of
splitting one of his TODOs [2].

---
[1]: https://lore.kernel.org/lkml/?q=f%3Agregkh%40linuxfoundation.org+s%3A%22make%22+and+s%3A%22const%22
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?h=bus_cleanup&id=26105f537f0c60eacfeb430abd2e05d7ddcdd8aa

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>

---
Ricardo B. Marliere (4):
      powerpc: cell: make spu_subsys const
      powerpc: ps3: make ps3_system_bus_type const
      powerpc: pseries: make cmm_subsys const
      powerpc: pseries: make suspend_subsys const

 arch/powerpc/platforms/cell/spu_base.c   | 2 +-
 arch/powerpc/platforms/ps3/system-bus.c  | 2 +-
 arch/powerpc/platforms/pseries/cmm.c     | 2 +-
 arch/powerpc/platforms/pseries/suspend.c | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)
---
base-commit: 44a1aad2fe6c10bfe0589d8047057b10a4c18a19
change-id: 20240204-bus_cleanup-powerpc-720c27d8f15c

Best regards,
-- 
Ricardo B. Marliere <ricardo@marliere.net>

[PATCH 1/4] powerpc: cell: make spu_subsys const

[Ricardo B. Marliere]

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

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
---
 arch/powerpc/platforms/cell/spu_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index dea6f0f25897..346e433d2706 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -465,7 +465,7 @@ void spu_init_channels(struct spu *spu)
 }
 EXPORT_SYMBOL_GPL(spu_init_channels);
 
-static struct bus_type spu_subsys = {
+static const struct bus_type spu_subsys = {
 	.name = "spu",
 	.dev_name = "spu",
 };

-- 
2.43.0

[PATCH 2/4] powerpc: ps3: make ps3_system_bus_type const

[Ricardo B. Marliere]

Now that the driver core can properly handle constant struct bus_type,
move the ps3_system_bus_type variable to be a constant structure as
well, placing it into read-only memory which can not be modified at
runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
---
 arch/powerpc/platforms/ps3/system-bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
index d6b5f5ecd515..b4298e98ffe8 100644
--- a/arch/powerpc/platforms/ps3/system-bus.c
+++ b/arch/powerpc/platforms/ps3/system-bus.c
@@ -466,7 +466,7 @@ static struct attribute *ps3_system_bus_dev_attrs[] = {
 };
 ATTRIBUTE_GROUPS(ps3_system_bus_dev);
 
-static struct bus_type ps3_system_bus_type = {
+static const struct bus_type ps3_system_bus_type = {
 	.name = "ps3_system_bus",
 	.match = ps3_system_bus_match,
 	.uevent = ps3_system_bus_uevent,

-- 
2.43.0

[PATCH 3/4] powerpc: pseries: make cmm_subsys const

[Ricardo B. Marliere]

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

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
---
 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 5f4037c1d7fe..6307dacc3862 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",
 };

-- 
2.43.0

[PATCH 4/4] powerpc: pseries: make suspend_subsys const

[Ricardo B. Marliere]

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

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
---
 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",
 };

-- 
2.43.0

Re: [PATCH 0/4] powerpc: struct bus_type cleanup

[Greg Kroah-Hartman]

On Sun, Feb 04, 2024 at 11:21:54AM -0300, Ricardo B. Marliere wrote:
> This series is part of an effort to cleanup the users of the driver
> core, as can be seen in many recent patches authored by Greg across the
> tree (e.g. [1]). Specifically, this series is part of the task of
> splitting one of his TODOs [2].
> 
> ---
> [1]: https://lore.kernel.org/lkml/?q=f%3Agregkh%40linuxfoundation.org+s%3A%22make%22+and+s%3A%22const%22
> [2]: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?h=bus_cleanup&id=26105f537f0c60eacfeb430abd2e05d7ddcdd8aa
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>

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

Re: [PATCH 2/4] powerpc: ps3: make ps3_system_bus_type const

[Geert Uytterhoeven]

On Sun, Feb 4, 2024 at 3:23 PM Ricardo B. Marliere <ricardo@marliere.net> wrote:
> Now that the driver core can properly handle constant struct bus_type,
> move the ps3_system_bus_type variable to be a constant structure as
> well, placing it into read-only memory which can not be modified at
> runtime.
>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 2/4] powerpc: ps3: make ps3_system_bus_type const

[Geoff Levand]

On 2/4/24 23:21, Ricardo B. Marliere wrote:
> Now that the driver core can properly handle constant struct bus_type,
> move the ps3_system_bus_type variable to be a constant structure as
> well, placing it into read-only memory which can not be modified at
> runtime.

> -static struct bus_type ps3_system_bus_type = {
> +static const struct bus_type ps3_system_bus_type = {
>  	.name = "ps3_system_bus",
>  	.match = ps3_system_bus_match,
>  	.uevent = ps3_system_bus_uevent,

Seems fine.

Acked-by: Geoff Levand <geoff@infradead.org>