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From: Sang-Heon Jeon <ekffu200098@gmail.com>
To: rppt@kernel.org, Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-mm@kvack.org, Sang-Heon Jeon <ekffu200098@gmail.com>,
	Alexandre Ghiti <alex@ghiti.fr>,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	Charlie Jenkins <thecharlesjenkins@gmail.com>
Subject: [PATCH v3 3/8] riscv: remove unreachable invalid range check in create_linear_mapping_page_table()
Date: Wed,  1 Jul 2026 00:04:08 +0900	[thread overview]
Message-ID: <20260630150413.1718632-4-ekffu200098@gmail.com> (raw)
In-Reply-To: <20260630150413.1718632-1-ekffu200098@gmail.com>

create_linear_mapping_page_table() iterates memblock regions with
for_each_mem_range() and breaks the loop when start >= end.
for_each_mem_range() never returns an invalid range, so start < end always.

Therefore the start >= end check is unreachable, so remove it.

No functional change.

Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Reviewed-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
---
 arch/riscv/mm/init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 5b1b3c88b4d1..eb93c2ac05a6 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1229,8 +1229,6 @@ static void __init create_linear_mapping_page_table(void)
 
 	/* Map all memory banks in the linear mapping */
 	for_each_mem_range(i, &start, &end) {
-		if (start >= end)
-			break;
 		if (start <= __pa(PAGE_OFFSET) &&
 		    __pa(PAGE_OFFSET) < end)
 			start = __pa(PAGE_OFFSET);
-- 
2.43.0



  parent reply	other threads:[~2026-06-30 15:04 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-30 15:04 [PATCH v3 0/8] treewide: remove unnecessary invalid range checks in memblock iteration loops Sang-Heon Jeon
2026-06-30 15:04 ` [PATCH v3 1/8] arm64: mm: remove unreachable invalid range check in kasan_init_shadow() Sang-Heon Jeon
2026-06-30 15:04 ` [PATCH v3 2/8] LoongArch: remove unreachable invalid range check in kasan_init() Sang-Heon Jeon
2026-06-30 15:04 ` Sang-Heon Jeon [this message]
2026-06-30 15:04 ` [PATCH v3 4/8] riscv: " Sang-Heon Jeon
2026-06-30 15:04 ` [PATCH v3 5/8] ARM: " Sang-Heon Jeon
2026-06-30 15:04 ` [PATCH v3 6/8] powerpc64/kasan: Remove unreachable invalid range check in kasan_init_phys_region() Sang-Heon Jeon
2026-06-30 15:04 ` [PATCH v3 7/8] mm: remove unnecessary empty range check in early_calculate_totalpages() Sang-Heon Jeon
2026-06-30 15:04 ` [PATCH v3 8/8] mm/hugetlb: remove unnecessary empty range check in hugetlb_bootmem_set_nodes() Sang-Heon Jeon

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