linux-kernel - [PATCH v2 3/5] powerpc: mpic: make mpic

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Message-Id: <20240212-bus_cleanup-powerpc2-v2-3-8441b3f77827@marliere.net>
Date: Mon, 12 Feb 2024 17:05:01 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Michael Ellerman <mpe@...erman.id.au>, 
 Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>, 
 "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH v2 3/5] 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.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 arch/powerpc/include/asm/mpic.h | 2 +-
 arch/powerpc/sysdev/mpic.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index 58353c5bd3fb..0c03a98986cd 100644
--- 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 dabbdd356664..d94cf36b0f65 100644
--- 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",
 };

-- 
2.43.0