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([110.9.142.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-847a02d41c0sm18474b3a.33.2026.06.29.09.38.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jun 2026 09:38:19 -0700 (PDT) From: Sang-Heon Jeon To: rppt@kernel.org, Madhavan Srinivasan , Michael Ellerman Cc: linux-mm@kvack.org, Sang-Heon Jeon , "Christophe Leroy (CS GROUP)" , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Nicholas Piggin Subject: [PATCH v2 6/8] powerpc64/kasan: Remove unreachable invalid range check in kasan_init_phys_region() Date: Tue, 30 Jun 2026 01:37:34 +0900 Message-ID: <20260629163736.1606688-7-ekffu200098@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260629163736.1606688-1-ekffu200098@gmail.com> References: <20260629163736.1606688-1-ekffu200098@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit kasan_init() maps each memblock region with for_each_mem_range() and passes it to kasan_init_phys_region(), which does nothing 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 --- arch/powerpc/mm/kasan/init_book3e_64.c | 3 --- arch/powerpc/mm/kasan/init_book3s_64.c | 3 --- 2 files changed, 6 deletions(-) diff --git a/arch/powerpc/mm/kasan/init_book3e_64.c b/arch/powerpc/mm/kasan/init_book3e_64.c index 0d3a73d6d4b0..0ed372fb8b09 100644 --- a/arch/powerpc/mm/kasan/init_book3e_64.c +++ b/arch/powerpc/mm/kasan/init_book3e_64.c @@ -68,9 +68,6 @@ static void __init kasan_init_phys_region(void *start, void *end) unsigned long k_start, k_end, k_cur; void *va; - if (start >= end) - return; - k_start = ALIGN_DOWN((unsigned long)kasan_mem_to_shadow(start), PAGE_SIZE); k_end = ALIGN((unsigned long)kasan_mem_to_shadow(end), PAGE_SIZE); diff --git a/arch/powerpc/mm/kasan/init_book3s_64.c b/arch/powerpc/mm/kasan/init_book3s_64.c index dcafa641804c..ccfbfb894637 100644 --- a/arch/powerpc/mm/kasan/init_book3s_64.c +++ b/arch/powerpc/mm/kasan/init_book3s_64.c @@ -24,9 +24,6 @@ static void __init kasan_init_phys_region(void *start, void *end) unsigned long k_start, k_end, k_cur; void *va; - if (start >= end) - return; - k_start = ALIGN_DOWN((unsigned long)kasan_mem_to_shadow(start), PAGE_SIZE); k_end = ALIGN((unsigned long)kasan_mem_to_shadow(end), PAGE_SIZE); -- 2.43.0