linux-kernel - [PATCH] arm64/mm: Drop INIT_MM

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Message-Id: <20241202043553.29592-1-anshuman.khandual@arm.com>
Date: Mon,  2 Dec 2024 10:05:53 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64/mm: Drop INIT_MM_CONTEXT()

Platform override for INIT_MM_CONTEXT() is redundant because swapper_pg_dir
always gets assigned as the pgd during init_mm initialization. So just drop
this override on arm64.

Originally this override was added via the 'commit 2b5548b68199 ("arm64/mm:
Separate boot-time page tables from swapper_pg_dir")' because non standard
init_pg_dir was assigned as the pgd. Subsequently it was changed as default
swapper_pg_dir by the 'commit ba5b0333a847 ("arm64: mm: omit redundant
remap of kernel image")', which might have also just dropped this override.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
This patch applies on v6.13-rc1

 arch/arm64/include/asm/mmu.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
index 2ec96d91acc6..662471cfc536 100644
--- a/arch/arm64/include/asm/mmu.h
+++ b/arch/arm64/include/asm/mmu.h
@@ -109,8 +109,5 @@ static inline bool kaslr_requires_kpti(void)
 	return true;
 }
 
-#define INIT_MM_CONTEXT(name)	\
-	.pgd = swapper_pg_dir,
-
 #endif	/* !__ASSEMBLY__ */
 #endif
-- 
2.30.2