From: Ard Biesheuvel <ardb+git@google.com>
To: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org, will@kernel.org,
catalin.marinas@arm.com, mark.rutland@arm.com,
Ard Biesheuvel <ardb@kernel.org>,
Ryan Roberts <ryan.roberts@arm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Liz Prucka <lizprucka@google.com>,
Seth Jenkins <sethjenkins@google.com>,
Kees Cook <kees@kernel.org>,
linux-hardening@vger.kernel.org
Subject: [PATCH v2 06/10] arm64: mm: Remove bogus stop condition from map_mem() loop
Date: Mon, 26 Jan 2026 10:26:37 +0100 [thread overview]
Message-ID: <20260126092630.1800589-18-ardb+git@google.com> (raw)
In-Reply-To: <20260126092630.1800589-12-ardb+git@google.com>
From: Ard Biesheuvel <ardb@kernel.org>
The memblock API guarantees that start is not greater than or equal to
end, so there is no need to test it. And if were, it is doubtful that
breaking out of the loop would be a reasonable course of action here
(rather than attempting to map the remaining regions)
So let's drop this check.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm64/mm/mmu.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index d7faa98f427c..377bdc4d84a1 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1158,8 +1158,6 @@ static void __init map_mem(pgd_t *pgdp)
/* map all the memory banks */
for_each_mem_range(i, &start, &end) {
- if (start >= end)
- break;
/*
* The linear map must allow allocation tags reading/writing
* if MTE is present. Otherwise, it has the same attributes as
--
2.52.0.457.g6b5491de43-goog
next prev parent reply other threads:[~2026-01-26 9:27 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-26 9:26 [PATCH v2 00/10] arm64: Unmap linear alias of kernel data/bss Ard Biesheuvel
2026-01-26 9:26 ` [PATCH v2 01/10] arm64: Move the zero page to rodata Ard Biesheuvel
2026-01-27 9:34 ` Ryan Roberts
2026-01-27 9:49 ` Ard Biesheuvel
2026-01-27 10:03 ` Ryan Roberts
2026-01-27 10:50 ` Ard Biesheuvel
2026-01-26 9:26 ` [PATCH v2 02/10] arm64: Move fixmap page tables to end of kernel image Ard Biesheuvel
2026-01-27 9:42 ` Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 03/10] arm64: mm: Permit contiguous descriptors to be rewritten Ard Biesheuvel
2026-01-27 9:45 ` Ryan Roberts
2026-01-27 15:03 ` Ard Biesheuvel
2026-01-27 16:59 ` Ryan Roberts
2026-01-27 17:02 ` Ard Biesheuvel
2026-01-27 17:37 ` Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 04/10] arm64: mm: Preserve existing table mappings when mapping DRAM Ard Biesheuvel
2026-01-27 9:58 ` Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 05/10] arm64: mm: Preserve non-contiguous descriptors " Ard Biesheuvel
2026-01-27 9:58 ` Ryan Roberts
2026-01-26 9:26 ` Ard Biesheuvel [this message]
2026-01-27 10:06 ` [PATCH v2 06/10] arm64: mm: Remove bogus stop condition from map_mem() loop Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 07/10] arm64: mm: Drop redundant pgd_t* argument from map_mem() Ard Biesheuvel
2026-01-27 10:10 ` Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 08/10] arm64: mm: Don't abuse memblock NOMAP to check for overlaps Ard Biesheuvel
2026-01-27 10:21 ` Ryan Roberts
2026-01-27 10:27 ` Ard Biesheuvel
2026-01-27 10:39 ` Ryan Roberts
2026-01-27 10:47 ` Ard Biesheuvel
2026-01-27 11:00 ` Ryan Roberts
2026-01-27 11:03 ` Ard Biesheuvel
2026-01-27 11:09 ` Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 09/10] arm64: mm: Map the kernel data/bss read-only in the linear map Ard Biesheuvel
2026-01-27 10:33 ` Ryan Roberts
2026-01-27 10:36 ` Ard Biesheuvel
2026-01-27 10:41 ` Ryan Roberts
2026-01-26 9:26 ` [PATCH v2 10/10] arm64: mm: Unmap kernel data/bss entirely from " Ard Biesheuvel
2026-01-27 10:50 ` Ryan Roberts
2026-01-27 10:54 ` Ard Biesheuvel
2026-01-27 11:02 ` Ryan Roberts
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