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Sat, 05 Sep 2026 12:30:09 -0700 (PDT) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-66fb48f1646sm5048420d50.9.2026.09.05.12.30.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Sep 2026 12:30:08 -0700 (PDT) From: Matt Turner Date: Sat, 05 Sep 2026 15:29:41 -0400 Subject: [PATCH v2 20/22] alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Precedence: bulk X-Mailing-List: linux-alpha@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-v2-20-83e8245761a2@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=978; i=mattst88@gmail.com; h=from:subject:message-id; bh=JPhW0tJqXaIn8Oiipq0xwNjIp3QnpGEFXpZHEWqLlVM=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLLm5E7ZFlC5udjK8G2+QNjblXbq+8wCGNa9X8Aisdcjd lKGzmeGjo8sDGJcDDPFFFni1iuyzGrbsdTntPQvmDmsTCBDpEUaGICAhYEvNzGv1EjHSM9U21DP EMjQMYqHyOkxaGQWF5emFummFRQ55OWXJJZk5ucV6+UXpOYVpBfopWWmlWRk5BcVpwKN0MtLLTF 1dXQzMjQwsXS0MHOycDQ1cXZ2MnRyc3R0dnUysjQ3MXC2dDRxtTRn4OIUgLnmUxkjw8Y7bG+ji6 30DMQV2kxNXgs9dNDgmlBboxzn5FQe0F5Ux/C/XsHX9Ad36NL+hrZzSm83227X+yEntV9rnaGak HO3Py8bAA== X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A activate_mm() on Alpha calls __load_new_mm_context() which assigns a new ASID and invokes PALcode swpctx. On SMP, an interrupt arriving between the ASID update and the page table switch could see inconsistent state. Ensure activate_mm() is called with interrupts disabled during exec. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner Tested-by: Magnus Lindholm Reviewed-by: Magnus Lindholm --- arch/alpha/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 33b51bef5139..e5611766b6d6 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -39,6 +39,7 @@ config ALPHA select GENERIC_PCI_IOMAP select AUTO_IRQ_AFFINITY if SMP select GENERIC_IRQ_SHOW + select ARCH_WANT_IRQS_OFF_ACTIVATE_MM select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_LD_ORPHAN_WARN select ARCH_HAVE_NMI_SAFE_CMPXCHG -- 2.54.0