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(unknown [9.109.204.116]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 12 Mar 2026 11:12:46 +0000 (GMT) Message-ID: <71921cca-b890-41c4-93e9-957d3f647ffa@linux.ibm.com> Date: Thu, 12 Mar 2026 16:42:45 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 09/15] arch/powerpc: don't initialize kasan if it's disabled To: Baoquan He , 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 References: <20260225081412.76502-1-bhe@redhat.com> <20260225081412.76502-10-bhe@redhat.com> Content-Language: en-US From: Sourabh Jain In-Reply-To: <20260225081412.76502-10-bhe@redhat.com> Content-Type: 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 ntdMFW0f 05DhcqjxKSx8dfipUsdFckYCoxsQP3JBiWHsPC7oiGI/pm1mbiql+Acc2heS7806v9VZAtSpqXhUHD7/EXGwFXwxK/q5Nt3LSGXKgimKW/FEp1mAz1cAzftiM6X7Exd/WMXQJ/8wsw2nU2ZNWkyYixoyFMVEQu1GwEtL4AhS5wD0pVlPYQXZ4rUaFvWd8n1x2lYuxsVwyUOpZ1NKYQ215+KwVAxwe32nDDauywUGs0o+0S77XNmYPAJZQ5UxXdB3S7/W1rnajU7iOCzz6+nFAe9Yr/M/hbUemf3RKaPEFcPJUlT3dOMHVtIxKDKA9l/hcH03/Mp7Zxz2dmr68nLt6GxiIhY9woR9s/HXv1xWz1sMExkFpSxNAR4mHDMDByCafxRZ0i8cYP701wYpsLzK/Cv0155FeIgl9ddFfuSIJ2G5SdL9t69WSUnRSHA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 25/02/26 13:44, Baoquan He wrote: > 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; Should we log in the kernel log buffer that KASAN is disabled? Right now, I don't see the kernel advertising the same. $ dmesg | grep -i kasan [    0.000000] Kernel command line: BOOT_IMAGE=(ieee1275//vdevice/v-scsi@30000070/disk@8100000000000000,msdos2)/vmlinuz-7.0.0-rc3+ crashkernel=2G kasan=off Tested this series on powerpc Pseries platform. So feel free to add: Tested-by: Sourabh Jain - Sourabh Jain