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Wed, 25 Feb 2026 03:16:11 -0500 X-MC-Unique: 5bDMHpyIN7qY2J9aFw6T_w-1 X-Mimecast-MFC-AGG-ID: 5bDMHpyIN7qY2J9aFw6T_w_1772007369 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4C83718003F6; Wed, 25 Feb 2026 08:16:09 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.55]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 50E031800465; Wed, 25 Feb 2026 08:15:58 +0000 (UTC) From: Baoquan He To: kasan-dev@googlegroups.com Cc: linux-mm@kvack.org, andreyknvl@gmail.com, ryabinin.a.a@gmail.com, glider@google.com, dvyukov@google.com, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com, linux-s390@vger.kernel.org, hca@linux.ibm.com, Baoquan He Subject: [PATCH v5 09/15] arch/powerpc: don't initialize kasan if it's disabled Date: Wed, 25 Feb 2026 16:14:06 +0800 Message-ID: <20260225081412.76502-10-bhe@redhat.com> In-Reply-To: <20260225081412.76502-1-bhe@redhat.com> References: <20260225081412.76502-1-bhe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-MFC-PROC-ID: _PQWV8a5J4v8Jy2AM3X9bapPlPsqEEUUZQdDTDU_QWQ_1772007369 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260225_081620_949970_2247905B X-CRM114-Status: UNSURE ( 9.58 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org Here, kasan is disabled if specified 'kasan=off' in kernel cmdline. This includes 32bit, book3s/64 and book3e/64. Signed-off-by: Baoquan He Cc: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/mm/kasan/init_32.c | 6 +++++- arch/powerpc/mm/kasan/init_book3e_64.c | 4 ++++ arch/powerpc/mm/kasan/init_book3s_64.c | 4 ++++ 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/kasan/init_32.c b/arch/powerpc/mm/kasan/init_32.c index 1d083597464f..0ea2a636c992 100644 --- a/arch/powerpc/mm/kasan/init_32.c +++ b/arch/powerpc/mm/kasan/init_32.c @@ -141,6 +141,10 @@ void __init kasan_init(void) u64 i; int ret; + /* If KASAN is disabled via command line, don't initialize it. */ + if (kasan_arg_disabled) + return; + for_each_mem_range(i, &base, &end) { phys_addr_t top = min(end, total_lowmem); @@ -170,7 +174,7 @@ void __init kasan_init(void) void __init kasan_late_init(void) { - if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) + if (IS_ENABLED(CONFIG_KASAN_VMALLOC) && kasan_enabled()) kasan_unmap_early_shadow_vmalloc(); } diff --git a/arch/powerpc/mm/kasan/init_book3e_64.c b/arch/powerpc/mm/kasan/init_book3e_64.c index 0d3a73d6d4b0..fbe4c9a7e460 100644 --- a/arch/powerpc/mm/kasan/init_book3e_64.c +++ b/arch/powerpc/mm/kasan/init_book3e_64.c @@ -111,6 +111,10 @@ void __init kasan_init(void) u64 i; pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL_RO); + /* If KASAN is disabled via command line, don't initialize it. */ + if (kasan_arg_disabled) + return; + for_each_mem_range(i, &start, &end) kasan_init_phys_region(phys_to_virt(start), phys_to_virt(end)); diff --git a/arch/powerpc/mm/kasan/init_book3s_64.c b/arch/powerpc/mm/kasan/init_book3s_64.c index dcafa641804c..f7906f9ef9be 100644 --- a/arch/powerpc/mm/kasan/init_book3s_64.c +++ b/arch/powerpc/mm/kasan/init_book3s_64.c @@ -54,6 +54,10 @@ void __init kasan_init(void) u64 i; pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL); + /* If KASAN is disabled via command line, don't initialize it. */ + if (kasan_arg_disabled) + return; + if (!early_radix_enabled()) { pr_warn("KASAN not enabled as it requires radix!"); return; -- 2.52.0