Subject: [PATCH v7 01/15] arm64: mm: Remove bogus stop condition from map_mem() loop

From: Ard Biesheuvel <[email-masked]>
Date: Fri, 29 May 2026 17:01:52 +0200

From: Ard Biesheuvel <[email-masked]>

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 <[email-masked]>
Reviewed-by: Kevin Brodsky <[email-masked]>
Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 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 dd85e093ffdb..112fa4a3b0eb 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1173,8 +1173,6 @@ 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
-- 
2.54.0.823.g6e5bcc1fc9-goog