From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A8F7D36C5B2 for ; Tue, 30 Jun 2026 15:04:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782831900; cv=none; b=XHUZsM3pGXOsuy9CF30yjiWHtIsSFd4BcwV0cYuaTnnT8QRQt3I4f79hI3Ne01DJhYsfwXYdo9fQvySs20oaXtm90+fOjs70jWtgt5hkI+6+VI7fagIynstAB+sFV4vJZ+9t63A0lnX53khZMYn0NvuP5AAUerckwMc7fThCUsM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782831900; c=relaxed/simple; bh=qa20S08+aIfBpQi8BPz6TvJWx28VH4PX0Bap7uCH0nc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NUjkfjJ0lrdkZBu0K/ZyAnYqzxK5a6kjhgTQfGdUiQDANNhryZG0t0U7eA6wsEMY7+1WkcpH14QO9bxsMSxCsFTBYmElTxfuPnoXg/1yUnDZmek1Ut7RJJtA7ofgi1fLA5W764NN4FLJPsdtKWGgzMQl6S1/ofg9TxVRyMP5UTs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=e68HCpUo; arc=none smtp.client-ip=209.85.214.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="e68HCpUo" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-2c9d87b1f9eso17335275ad.3 for ; Tue, 30 Jun 2026 08:04:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1782831899; x=1783436699; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=PPX10qsMY++ER8afXSJu3F27jyGSgCeFMlyZg3pCc1s=; b=e68HCpUovmiF/TJEWauYYr/bRfMkHPVNrI4/yLRvMDh6jnNJcxh7MGx5rLds9quuK2 UUoNKHM/PNI5+uaT6ciDaDugEi/aH0AFoac/6s+WSe7rCAVLihNnD2mipB0puK4u3b3B YL/5tFOp5eugEich46iYGaQiduwSFjAgaetZThhJRoERplUWQI3ho6MvGH+3rFiATfZV U0acqv9OViO3IUkdsSITapFR8teqnrkHVRFrb646qeZzLSWqlt4kcJRkVx0MhhoOnW2G dB0rarmayWSEQBDZjxqGgPFZGN5WRgUtXMl73mBYKJRgmwPDTCBvNNZxg+BsUTDjgCf1 5uYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782831899; x=1783436699; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=PPX10qsMY++ER8afXSJu3F27jyGSgCeFMlyZg3pCc1s=; b=E1N4Th9hh0tN0tE1MMe4q1EA9Jva5mtRy7TE+aojAUXS9vyt3q4KJuAX2R2fVaQovk kKF5NVGBEHMmDmG5IwVBzALy0PKXp3pdTVePxiGMPGCjsnB7YigE4iALYkbqwtxjBuiY qNfWrxAbJNnkzb9ZjLv16Fr3z3V4AtkcqW3rmCRMdT2S6Au9y4IPOMSISyxGsGyK21+S PmIeielLLYE5dMFOznuWNvniekq5RE8hM+SNGRCMTZnavp/mTyP5A1p3bVZ+KyJBC3sN nFe6MXsYeN9xEpjfIre9ivXQ4zRwnb4ZjdFFUNlxBvN1ad53Slkir6CqiuOWS1r2o6cF 7IUg== X-Forwarded-Encrypted: i=1; AHgh+Rr0PTN2xdtlhqvasu/um9+rKbKT+PNVs07mDJVqO6T47arTjMP9s9ZtwICOHfxNve2hCBFii0Xcdcbrolk=@vger.kernel.org X-Gm-Message-State: AOJu0YyDUNIwX9uSUgu5YB32Cbr1Hi3AgjE+awrMsX1dO/y0oZ//lXL6 H1shwqLhTp1N4LKINuayBvD+R9HALt0tFhWTvRXBauR9d/m87RkKTtmv X-Gm-Gg: AfdE7cnR/xRYaBJEhk6blOY8TkaOPVyinO6yqcttfkVuoldy2rmZHosNdwHq/W9ifnW epJqH1qyCG12m8XZPhNLMxG6Lmxw4I9mA6KsXesjC2tt9pj81TtX94hn+xHX7dI6Djl/n2xUB9V tkokGfpB83ZGJLwMLWYm/Ad410DSlEAK2YCKz6TTS5E4ASeiTGTJ9DkAjbdUPVec5eHlyZmzVlz khznVZn+xZ2YZpzirxQ+L6DrGGsAHQfVg9VYAkGziinlpeBBULletiQJ4lg/8rioKdECah8LP3W M3qAiiWXTls0Bx7C6WxmNXd9d6aQCV6h7h11aniERwScol48qKjW3GWs102KSQS8tF5ofH9tvcH UG6o+o5F89AhVKFek5ibRj4m+j7W7Xt4iFydfTwV2eViVNDhfyF4frUuXMO/BpNMS0NsSkfqi/7 wR/uziOac= X-Received: by 2002:a17:903:b4e:b0:2ca:5d24:720b with SMTP id d9443c01a7336-2ca5d247390mr6710495ad.39.1782831898986; Tue, 30 Jun 2026 08:04:58 -0700 (PDT) Received: from ubuntu.. ([110.9.142.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ca37a70bc0sm16250465ad.10.2026.06.30.08.04.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jun 2026 08:04:58 -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 v3 6/8] powerpc64/kasan: Remove unreachable invalid range check in kasan_init_phys_region() Date: Wed, 1 Jul 2026 00:04:11 +0900 Message-ID: <20260630150413.1718632-7-ekffu200098@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260630150413.1718632-1-ekffu200098@gmail.com> References: <20260630150413.1718632-1-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