linux-kernel - [PATCH v2 11/12] arm64: memory: Make virt_to

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Message-Id: <20230503-virt-to-pfn-v6-4-rc1-v2-11-0948d38bddab@linaro.org>
Date:   Mon, 22 May 2023 09:00:46 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Vineet Gupta <vgupta@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Greg Ungerer <gerg@...ux-m68k.org>
Cc:     linux-mm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org,
        linux-snps-arc@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 11/12] arm64: memory: Make virt_to_pfn() a static inline

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.

Since arm64 is using <asm-generic/memory_model.h> to provide
__phys_to_pfn() we need to move the inclusion of that header
up, so we can resolve the static inline at compile time.

Acked-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 arch/arm64/include/asm/memory.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index c735afdf639b..4d85212b622e 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -331,6 +331,14 @@ static inline void *phys_to_virt(phys_addr_t x)
 	return (void *)(__phys_to_virt(x));
 }
 
+/* Needed already here for resolving __phys_to_pfn() in virt_to_pfn() */
+#include <asm-generic/memory_model.h>
+
+static inline unsigned long virt_to_pfn(const void *kaddr)
+{
+	return __phys_to_pfn(virt_to_phys(kaddr));
+}
+
 /*
  * Drivers should NOT use these either.
  */
@@ -339,7 +347,6 @@ static inline void *phys_to_virt(phys_addr_t x)
 #define __pa_nodebug(x)		__virt_to_phys_nodebug((unsigned long)(x))
 #define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
-#define virt_to_pfn(x)		__phys_to_pfn(__virt_to_phys((unsigned long)(x)))
 #define sym_to_pfn(x)		__phys_to_pfn(__pa_symbol(x))
 
 /*

-- 
2.34.1