[PATCH v4 05/15] arm64: mm: Remove bogus stop condition from map_mem() loop

Ard Biesheuvel
2026-04-27T15:35:41Z

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 it 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.

Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
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 005844e521bd..bfbf3fe0d1be 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1177,8 +1177,6 @@ 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
--
2.54.0.rc2.544.gc7ae2d5bb8-goog