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Mon, 2 Feb 2026 02:18:38 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: ASnEhGskTYsw Date: Mon, 02 Feb 2026 08:18:17 +0100 From: "Arnd Bergmann" To: "Yang Shi" , "Catalin Marinas" , "Will Deacon" , "Ryan Roberts" , "Andrew Morton" , "David Hildenbrand" , "Lorenzo Stoakes" , "Ard Biesheuvel" , "Dev Jain" , scott@os.amperecomputing.com, "Christoph Lameter (Ampere)" Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Message-Id: In-Reply-To: <20250917190323.3828347-5-yang@os.amperecomputing.com> References: <20250917190323.3828347-1-yang@os.amperecomputing.com> <20250917190323.3828347-5-yang@os.amperecomputing.com> Subject: Re: [PATCH v8 4/5] arm64: mm: split linear mapping if BBML2 unsupported on secondary CPUs Content-Type: text/plain Content-Transfer-Encoding: 7bit On Wed, Sep 17, 2025, at 21:02, Yang Shi wrote: > + .pushsection ".idmap.text", "a" > +SYM_TYPED_FUNC_START(wait_linear_map_split_to_ptes) > + /* Must be same registers as in idmap_kpti_install_ng_mappings */ > + swapper_ttb .req x3 > + flag_ptr .req x4 > + > + mrs swapper_ttb, ttbr1_el1 > + adr_l flag_ptr, idmap_kpti_bbml2_flag > + __idmap_cpu_set_reserved_ttbr1 x16, x17 I'm getting build failures here, using CONFIG_CFI using clang-21: ld.lld-21: error: undefined symbol: __kcfi_typeid_wait_linear_map_split_to_ptes >>> referenced by arch/arm64/mm/proc.o:(.idmap.text+0x298) in archive vmlinux.a I can get it to build by using plain SYM_FUNC_START() instead of SYM_TYPED_FUNC_START(), but I have no idea if that makes any sense: --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -439,7 +439,7 @@ SYM_FUNC_END(idmap_kpti_install_ng_mappings) #endif .pushsection ".idmap.text", "a" -SYM_TYPED_FUNC_START(wait_linear_map_split_to_ptes) +SYM_FUNC_START(wait_linear_map_split_to_ptes) /* Must be same registers as in idmap_kpti_install_ng_mappings */ swapper_ttb .req x3 flag_ptr .req x4 Arnd