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Sun, 25 Oct 2026 00:43:00 -0700 (PDT) Received: from buildhost.darklands.se ([2001:9b1:ff:d701:51eb:176f:63d9:53f8]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b445990d9bsm2033641a12.30.2026.10.25.00.43.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Oct 2026 00:43:00 -0700 (PDT) From: Magnus Lindholm To: richard.henderson@linaro.org, mattst88@gmail.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org Cc: linmag7@gmail.com Subject: [PATCH] alpha: fix PR_GET_UNALIGN flag mask Date: Sun, 25 Oct 2026 08:38:50 +0100 Message-ID: <20261025074237.1050419-1-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit GET_UNALIGN_CTL clears the flags it needs to read, so PR_GET_UNALIGN always returns zero. Keep the UAC bits when translating them to prctl flags. This was uncovered while running the strace test suite on Alpha. Fixes: 3185bd261882 ("alpha: separate thread-synchronous flags") Signed-off-by: Magnus Lindholm --- Tested on UP2000+ (SMP). A standalone regression probe verifies flag round-trips, EFAULT handling and fork isolation. The probe and unchanged strace prctl-unalign test fail before the fix and pass afterwards. arch/alpha/include/asm/thread_info.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h index d781ac79106d..22c07ce0a77a 100644 --- a/arch/alpha/include/asm/thread_info.h +++ b/arch/alpha/include/asm/thread_info.h @@ -110,7 +110,7 @@ register unsigned long *current_stack_pointer __asm__ ("$30"); 0; }) #define GET_UNALIGN_CTL(task,value) ({ \ - __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ + __u32 status = task_thread_info(task)->status & UAC_BITMASK; \ __u32 res = 0; \ if (status & TS_UAC_NOPRINT) \ res |= PR_UNALIGN_NOPRINT; \ base-commit: 71cf9644bcb35e686c3e12a703325335a0925946 -- 2.43.0