powerpc: mpic: make mpic_subsys const

Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the mpic_subsys variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: "Ricardo B. Marliere" <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240212-bus_cleanup-powerpc2-v2-3-8441b3f77827@marliere.net

diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index 58353c5bd3fba6e2b1549e05a6b4b8928b1c92af..0c03a98986cdea583ca5235d6e8a24c301e4a323 100644 (file)
--- a/arch/powerpc/include/asm/mpic.h
+++ b/arch/powerpc/include/asm/mpic.h
@@ -336,7 +336,7 @@ struct mpic
 #endif
 };
 
-extern struct bus_type mpic_subsys;
+extern const struct bus_type mpic_subsys;
 
 /*
  * MPIC flags (passed to mpic_alloc)

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index dabbdd356664cdf5bf1f7eb3d07a9c54795ab721..d94cf36b0f65865cb56cabc7d4498dc3eb287a02 100644 (file)
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -49,7 +49,7 @@
 #define DBG(fmt...)
 #endif
 
-struct bus_type mpic_subsys = {
+const struct bus_type mpic_subsys = {
        .name = "mpic",
        .dev_name = "mpic",
 };