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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: WzhHRcWcvyZ3oFoYuIfbn7E-j7t7zk-LNfvy8JnR288_1772007369 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: C67461A000F X-Rspamd-Server: rspam02 X-Stat-Signature: nsazh7g3iyr71szmwi4x4s9grwmn55fp X-HE-Tag: 1772007376-844781 X-HE-Meta: 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 U6SXjys1 QjdXDvoCqOK10EQc4Lw481DTch1/84uE8Umadf/RIQhtxqHHbbNk7Lsq+vlsb9QZKbUjGFwQNrZEoCbNZfanfqDOsWSWi2BLhPuYSooxDXmUBR0RppHMD3l3Q3/MptkCmXUXnVhV9Bq40ndoMa1t4GXDg4Le2zlYP29+m6Qd3eOTmRy0MQaQnm1UlH+tP4i/m5zRMMLnQro0VpiDMG5OWPg8IzcGQoLfeMJzs7T+x4SqWNSGaZFqv6Qg9TkqIz1TpTIvprjZtkh6Ix33s+YrxKEfIsW17qGUhV9RFZwlRkF/SD8CQJUX+VI3Mww3ronebuxojzm3T5pVSSSs0LAIMWt6NPeh8UDxdBmz7W0m4ztqyd5JdOCcMMhRwFgBwFnngcdLpu35kfrD6y8GQaM8zhLDsx1qZntANeiYNyJn6ZPNINttZQ64bWRA6kzH+lcYvHNK46P48YRMDj/o= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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