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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4804706ef6csm51088835e9.15.2026.01.22.02.25.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jan 2026 02:25:56 -0800 (PST) Date: Thu, 22 Jan 2026 10:25:54 +0000 From: David Laight To: kernel test robot Cc: Nathan Chancellor , Greg Kroah-Hartman , Thomas Gleixner , Peter Zijlstra , Ingo Molnar , Mathieu Desnoyers , Arnd Bergmann , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Yury Norov , Jani Nikula , Vincent Mailhol , Andy Shevchenko , Kees Cook , Andrew Morton , oe-kbuild-all@lists.linux.dev, Linux Memory Management List Subject: Re: [PATCH next 11/14] bit: Strengthen compile-time tests in GENMASK() and BIT() Message-ID: <20260122102554.1cc7a2a3@pumpkin> In-Reply-To: <202601220829.MgTMeqqN-lkp@intel.com> References: <20260121145731.3623-12-david.laight.linux@gmail.com> <202601220829.MgTMeqqN-lkp@intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) MIME-Version: 1.0 Content-Type: text/plain; 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The bit of mm.h is: #define PP_DMA_INDEX_SHIFT (1 + __fls(PP_SIGNATURE - POISON_POINTER_DELTA)) #if POISON_POINTER_DELTA > 0 /* PP_SIGNATURE includes POISON_POINTER_DELTA, so limit the size of the DMA * index to not overlap with that if set */ #define PP_DMA_INDEX_BITS MIN(32, __ffs(POISON_POINTER_DELTA) - PP_DMA_INDEX_SHIFT) #else /* Use the lowest bit of PAGE_OFFSET if there's at least 8 bits available; see above */ #define PP_DMA_INDEX_MIN_OFFSET (1 << (PP_DMA_INDEX_SHIFT + 8)) #define PP_DMA_INDEX_BITS ((__builtin_constant_p(PAGE_OFFSET) && \ PAGE_OFFSET >= PP_DMA_INDEX_MIN_OFFSET && \ !(PAGE_OFFSET & (PP_DMA_INDEX_MIN_OFFSET - 1))) ? \ MIN(32, __ffs(PAGE_OFFSET) - PP_DMA_INDEX_SHIFT) : 0) #endif #define PP_DMA_INDEX_MASK GENMASK(PP_DMA_INDEX_BITS + PP_DMA_INDEX_SHIFT - 1, \ PP_DMA_INDEX_SHIFT) I've no idea what the values are, but the 'hi' bit number must exceed that of 'long'. The __ffs() probably stop it being an 'integer constant expression' making it just a 'compile time constant' - which I added a test for. David