linux-kernel - [PATCH v2] openrisc: Make pfn accessors statics inlines

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Message-Id: <20230811-virt-to-phys-openrisc-v2-1-3500d015bcc0@linaro.org>
Date:   Fri, 11 Aug 2023 09:01:17 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>
Cc:     linux-openrisc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2] openrisc: Make pfn accessors statics inlines

Making virt_to_pfn() a static inline taking a strongly typed
(const void *) makes the contract of a passing a pointer of that
type to the function explicit and exposes any misuse of the
macro virt_to_pfn() acting polymorphic and accepting many types
such as (void *), (unitptr_t) or (unsigned long) as arguments
without warnings.

For symmetry, do the same with pfn_to_virt().

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
Changes in v2:
- Cast around a bit in the pfn_to_virt() function so we don't
  get pointer violation complaints.
- Link to v1: https://lore.kernel.org/r/20230808-virt-to-phys-openrisc-v1-1-b2c16cf000a8@linaro.org
---
 arch/openrisc/include/asm/page.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/openrisc/include/asm/page.h b/arch/openrisc/include/asm/page.h
index 52b0d7e76446..44fc1fd56717 100644
--- a/arch/openrisc/include/asm/page.h
+++ b/arch/openrisc/include/asm/page.h
@@ -72,8 +72,15 @@ typedef struct page *pgtable_t;
 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
 
-#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
-#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
+static inline unsigned long virt_to_pfn(const void *kaddr)
+{
+	return __pa(kaddr) >> PAGE_SHIFT;
+}
+
+static inline void * pfn_to_virt(unsigned long pfn)
+{
+	return (void *)((unsigned long)__va(pfn) << PAGE_SHIFT);
+}
 
 #define virt_to_page(addr) \
 	(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))

---
base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
change-id: 20230808-virt-to-phys-openrisc-8ff05c233aef

Best regards,
-- 
Linus Walleij <linus.walleij@...aro.org>