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Sat, 05 Sep 2026 12:29:49 -0700 (PDT) From: Matt Turner Date: Sat, 05 Sep 2026 15:29:32 -0400 Subject: [PATCH v2 11/22] alpha: add HAVE_ARCH_THREAD_STRUCT_WHITELIST support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260905-arch-kconfig-options-v2-v2-11-83e8245761a2@gmail.com> References: <20260905-arch-kconfig-options-v2-v2-0-83e8245761a2@gmail.com> In-Reply-To: <20260905-arch-kconfig-options-v2-v2-0-83e8245761a2@gmail.com> To: Richard Henderson , Magnus Lindholm , Kees Cook , Marco Elver , Andrey Konovalov , Andrey Ryabinin , Jonathan Corbet , Shuah Khan , Randy Dunlap Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-hardening@vger.kernel.org, linux-doc@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1561; i=mattst88@gmail.com; h=from:subject:message-id; bh=CxsncyAy/tDPq6kjsUgXXkzMFX+fCNq5D9C9gc0wrmU=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLLm5E7xnBDyff5cdusPor+VVb9Jxn2c+6aj0E+pvI495 71/2X+Hjo8sDGJcDDPFFFni1iuyzGrbsdTntPQvmDmsTCBDpEUaGICAhYEvNzGv1EjHSM9U21DP EMjQMYqHyOkxaGQWF5emFummFRQ55OWXJJZk5ucV6+UXpOYVpBfopWWmlWRk5BcVpwKN0MtLLTF 1dXQzMjQwsXS0MHOycDQ1cXZ2MnRyc3R0dnUysjQ3MXC2dDRxtTRn4OIUgLmG7wkjw2nGx44zOV MfnMvZMOmsqMAUxfxrvvfni9pPLDUu/rh+fSbDT8a1LW7uYRP+vWrc9/yJb+63R6Jla3IuvNqwm 63EtOHtAR4A X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A Alpha's thread_struct is empty (all per-thread state lives in thread_info), so the whitelist is trivially empty. This is more explicit than the generic fallback, which computes the full thread_struct size as copyable. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner Tested-by: Magnus Lindholm Reviewed-by: Magnus Lindholm --- arch/alpha/Kconfig | 1 + arch/alpha/include/asm/processor.h | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 8f97d6e22b28..cc69f94a1c5b 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -44,6 +44,7 @@ config ALPHA select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_SECCOMP select HAVE_ARCH_SECCOMP_FILTER + select HAVE_ARCH_THREAD_STRUCT_WHITELIST select HAVE_ARCH_TRACEHOOK select HAVE_MOD_ARCH_SPECIFIC select LOCK_MM_AND_FIND_VMA diff --git a/arch/alpha/include/asm/processor.h b/arch/alpha/include/asm/processor.h index 5dce5518a211..c461a26d47b3 100644 --- a/arch/alpha/include/asm/processor.h +++ b/arch/alpha/include/asm/processor.h @@ -26,6 +26,13 @@ struct thread_struct { }; #define INIT_THREAD { } +static inline void arch_thread_struct_whitelist(unsigned long *offset, + unsigned long *size) +{ + *offset = 0; + *size = 0; +} + /* Do necessary setup to start up a newly executed thread. */ struct pt_regs; extern void start_thread(struct pt_regs *, unsigned long, unsigned long); -- 2.54.0