linux-kernel - [PATCH v2 2/2] mips: cm: Convert __mips_cm_phys

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Message-ID: <20240226105427.7191-3-fancer.lancer@gmail.com>
Date: Mon, 26 Feb 2024 13:54:22 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Arnd Bergmann <arnd@...db.de>,
	Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Serge Semin <fancer.lancer@...il.com>,
	Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] mips: cm: Convert __mips_cm_phys_base() to weak function

Based on the design pattern utilized in the CM GCR base address getter
implementation, the platform-specific code is capable to re-define the
getter and re-use the weakly defined initial version. But since the
pattern hasn't been used for over 10 years and another similar case (CM
L2-sync only base address getter) has just been fixed, let's unify the
interface and convert it to a more traditional single weakly defined
method: mips_cm_phys_base() (see the link below for the discussion around
this).

Link: https://lore.kernel.org/linux-mips/20240215171740.14550-3-fancer.lancer@gmail.com
Signed-off-by: Serge Semin <fancer.lancer@...il.com>

---

Changelog v2:
- Convert the underscored method to a single weakly defined function.
---
 arch/mips/include/asm/mips-cm.h | 7 +++----
 arch/mips/kernel/mips-cm.c      | 5 +----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h
index 6cc79296c8ef..c4e27970d88f 100644
--- a/arch/mips/include/asm/mips-cm.h
+++ b/arch/mips/include/asm/mips-cm.h
@@ -22,16 +22,15 @@ extern void __iomem *mips_gcr_base;
 extern void __iomem *mips_cm_l2sync_base;
 
 /**
- * __mips_cm_phys_base - retrieve the physical base address of the CM
+ * mips_cm_phys_base - retrieve the physical base address of the CM
  *
  * This function returns the physical base address of the Coherence Manager
  * global control block, or 0 if no Coherence Manager is present. It provides
  * a default implementation which reads the CMGCRBase register where available,
  * and may be overridden by platforms which determine this address in a
- * different way by defining a function with the same prototype except for the
- * name mips_cm_phys_base (without underscores).
+ * different way by defining a function with the same prototype.
  */
-extern phys_addr_t __mips_cm_phys_base(void);
+extern phys_addr_t mips_cm_phys_base(void);
 
 /**
  * mips_cm_l2sync_phys_base - retrieve the physical base address of the CM
diff --git a/arch/mips/kernel/mips-cm.c b/arch/mips/kernel/mips-cm.c
index 268ac0b811e3..3a115fab5573 100644
--- a/arch/mips/kernel/mips-cm.c
+++ b/arch/mips/kernel/mips-cm.c
@@ -179,7 +179,7 @@ static char *cm3_causes[32] = {
 static DEFINE_PER_CPU_ALIGNED(spinlock_t, cm_core_lock);
 static DEFINE_PER_CPU_ALIGNED(unsigned long, cm_core_lock_flags);
 
-phys_addr_t __mips_cm_phys_base(void)
+phys_addr_t __weak mips_cm_phys_base(void)
 {
 	unsigned long cmgcr;
 
@@ -198,9 +198,6 @@ phys_addr_t __mips_cm_phys_base(void)
 	return (cmgcr & MIPS_CMGCRF_BASE) << (36 - 32);
 }
 
-phys_addr_t mips_cm_phys_base(void)
-	__attribute__((weak, alias("__mips_cm_phys_base")));
-
 phys_addr_t __weak mips_cm_l2sync_phys_base(void)
 {
 	u32 base_reg;
-- 
2.43.0