linux-kernel - [PATCH v2 2/2] csky: Make pfn accessors static inlines

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Message-Id: <20230809-csky-virt-to-phys-v2-2-2697c93f60cf@linaro.org>
Date:   Wed, 09 Aug 2023 10:14:02 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Vineet Gupta <vgupta@...nel.org>, Guo Ren <guoren@...nel.org>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 2/2] csky: Make pfn accessors static 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 to the same thing with pfn_to_virt().

In order to do this we move the virt_to_phys() and
phys_to_virt() below the definitions of the __pa()
and __va() macros so it compiles. The macro version was also
able to do recursive symbol resolution.

Acked-by: Guo Ren <guoren@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 arch/csky/include/asm/page.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h
index b23e3006a9e0..57b3f106ae77 100644
--- a/arch/csky/include/asm/page.h
+++ b/arch/csky/include/asm/page.h
@@ -34,9 +34,6 @@
 
 #include <linux/pfn.h>
 
-#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
-#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
-
 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
 			(void *)(kaddr) < high_memory)
 
@@ -80,6 +77,16 @@ extern unsigned long va_pa_offset;
 
 #define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))
 
+static inline unsigned long virt_to_pfn(const void *kaddr)
+{
+	return __pa(kaddr) >> PAGE_SHIFT;
+}
+
+static inline const void * pfn_to_virt(unsigned long pfn)
+{
+	return (const void *)((unsigned long)__va(pfn) << PAGE_SHIFT);
+}
+
 #define MAP_NR(x)	PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
 				 PHYS_OFFSET_OFFSET)
 #define virt_to_page(x)	(mem_map + MAP_NR(x))

-- 
2.34.1