tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 642b151f45dd54809ea00ecd3976a56c1ec9b53d commit: 295bcca84916cb5079140a89fccb472bb8d1f6e2 linux/bits.h: add compile time sanity check of GENMASK inputs date: 6 weeks ago config: arm-randconfig-r016-20200519 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 295bcca84916cb5079140a89fccb472bb8d1f6e2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/bits.h:23, from include/linux/bitops.h:5, from include/linux/of.h:15, from include/linux/clk-provider.h:9, from drivers/clk/clk-stm32f4.c:8: drivers/clk/clk-stm32f4.c: In function 'stm32f4_rcc_lookup_clk_idx': include/linux/bits.h:26:28: warning: comparison is always false due to limited range of data type [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO' 16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) | ^ include/linux/bits.h:45:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) | ^~~~~~~~~~~~~~~~~~~ 871 | GENMASK_ULL(secondary % BITS_PER_LONG_LONG, 0); | ^~~~~~~~~~~ include/linux/bits.h:26:40: warning: comparison is always false due to limited range of data type [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO' 16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) | ^ include/linux/bits.h:45:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) | ^~~~~~~~~~~~~~~~~~~ 871 | GENMASK_ULL(secondary % BITS_PER_LONG_LONG, 0); | ^~~~~~~~~~~ -- In file included from include/linux/bits.h:23, from include/linux/bitops.h:5, from include/linux/kernel.h:12, from include/linux/mfd/syscon/atmel-smc.h:14, from drivers/mfd/atmel-smc.c:11: drivers/mfd/atmel-smc.c: In function 'atmel_smc_cs_encode_ncycles': include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO' 16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) | ^ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ 49 | unsigned int lsbmask = GENMASK(msbpos - 1, 0); | ^~~~~~~ include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO' 16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) | ^ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ 49 | unsigned int lsbmask = GENMASK(msbpos - 1, 0); | ^~~~~~~ include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO' 16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) | ^ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/mfd/atmel-smc.c:50:25: note: in expansion of macro 'GENMASK' 50 | unsigned int msbmask = GENMASK(msbwidth - 1, 0); | ^~~~~~~ include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO' 16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) | ^ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/mfd/atmel-smc.c:50:25: note: in expansion of macro 'GENMASK' 50 | unsigned int msbmask = GENMASK(msbwidth - 1, 0); | ^~~~~~~ -- In file included from include/linux/byteorder/little_endian.h:5, from arch/arm/include/uapi/asm/byteorder.h:22, from include/asm-generic/bitops/le.h:6, from arch/arm/include/asm/bitops.h:268, from include/linux/bitops.h:29, from include/linux/kernel.h:12, from include/linux/clk.h:13, from drivers/crypto/inside-secure/safexcel.c:8: drivers/crypto/inside-secure/safexcel.c: In function 'safexcel_hw_init': include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: in definition of macro '__cpu_to_le32' 33 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) | ^ 307 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) | ^~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:648:4: note: in expansion of macro 'writel' 648 | writel(EIP197_HIA_RA_PE_CTRL_EN | | ^~~~~~ include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( | ^~~~~~~~~~~~~~~~~ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:649:11: note: in expansion of macro 'GENMASK' 649 | GENMASK(priv->config.rings - 1, 0), | ^~~~~~~ include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: in definition of macro '__cpu_to_le32' 33 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) | ^ 307 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) | ^~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:648:4: note: in expansion of macro 'writel' 648 | writel(EIP197_HIA_RA_PE_CTRL_EN | | ^~~~~~ include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( | ^~~~~~~~~~~~~~~~~ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:649:11: note: in expansion of macro 'GENMASK' 649 | GENMASK(priv->config.rings - 1, 0), | ^~~~~~~ include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: in definition of macro '__cpu_to_le32' 33 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) | ^ 307 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) | ^~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:757:3: note: in expansion of macro 'writel' 757 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~ include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( | ^~~~~~~~~~~~~~~~~ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:757:35: note: in expansion of macro 'GENMASK' 757 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~~ include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: in definition of macro '__cpu_to_le32' 33 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) | ^ 307 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) | ^~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:757:3: note: in expansion of macro 'writel' 757 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~ include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( | ^~~~~~~~~~~~~~~~~ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:757:35: note: in expansion of macro 'GENMASK' 757 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~~ include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: in definition of macro '__cpu_to_le32' 33 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) | ^ 307 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) | ^~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:761:3: note: in expansion of macro 'writel' 761 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~ include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( | ^~~~~~~~~~~~~~~~~ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:761:35: note: in expansion of macro 'GENMASK' 761 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~~ include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: in definition of macro '__cpu_to_le32' 33 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) | ^ 307 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) | ^~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:761:3: note: in expansion of macro 'writel' 761 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~ include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( | ^~~~~~~~~~~~~~~~~ include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK' 39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~~~~~~~~~~~ drivers/crypto/inside-secure/safexcel.c:761:35: note: in expansion of macro 'GENMASK' 761 | writel(EIP197_DxE_THR_CTRL_EN | GENMASK(priv->config.rings - 1, 0), | ^~~~~~~ vim +/GENMASK_ULL +871 drivers/clk/clk-stm32f4.c 358bdf892f6bfa Daniel Thompson 2015-06-10 846 358bdf892f6bfa Daniel Thompson 2015-06-10 847 /* 358bdf892f6bfa Daniel Thompson 2015-06-10 848 * Converts the primary and secondary indices (as they appear in DT) to an 358bdf892f6bfa Daniel Thompson 2015-06-10 849 * offset into our struct clock array. 358bdf892f6bfa Daniel Thompson 2015-06-10 850 */ 358bdf892f6bfa Daniel Thompson 2015-06-10 851 static int stm32f4_rcc_lookup_clk_idx(u8 primary, u8 secondary) 358bdf892f6bfa Daniel Thompson 2015-06-10 852 { a064a07f72e92c Gabriel Fernandez 2016-10-21 853 u64 table[MAX_GATE_MAP]; 358bdf892f6bfa Daniel Thompson 2015-06-10 854 358bdf892f6bfa Daniel Thompson 2015-06-10 855 if (primary == 1) { 88c9b70bb2b218 Gabriel Fernandez 2017-01-06 856 if (WARN_ON(secondary >= stm32fx_end_primary_clk)) 358bdf892f6bfa Daniel Thompson 2015-06-10 857 return -EINVAL; 358bdf892f6bfa Daniel Thompson 2015-06-10 858 return secondary; 358bdf892f6bfa Daniel Thompson 2015-06-10 859 } 358bdf892f6bfa Daniel Thompson 2015-06-10 860 a064a07f72e92c Gabriel Fernandez 2016-10-21 861 memcpy(table, stm32f4_gate_map, sizeof(table)); 358bdf892f6bfa Daniel Thompson 2015-06-10 862 358bdf892f6bfa Daniel Thompson 2015-06-10 863 /* only bits set in table can be used as indices */ 15ab38273d21a4 Daniel Thompson 2015-06-28 864 if (WARN_ON(secondary >= BITS_PER_BYTE * sizeof(table) || 358bdf892f6bfa Daniel Thompson 2015-06-10 865 0 == (table[BIT_ULL_WORD(secondary)] & 358bdf892f6bfa Daniel Thompson 2015-06-10 866 BIT_ULL_MASK(secondary)))) 358bdf892f6bfa Daniel Thompson 2015-06-10 867 return -EINVAL; 358bdf892f6bfa Daniel Thompson 2015-06-10 868 358bdf892f6bfa Daniel Thompson 2015-06-10 869 /* mask out bits above our current index */ 358bdf892f6bfa Daniel Thompson 2015-06-10 870 table[BIT_ULL_WORD(secondary)] &= 358bdf892f6bfa Daniel Thompson 2015-06-10 @871 GENMASK_ULL(secondary % BITS_PER_LONG_LONG, 0); 358bdf892f6bfa Daniel Thompson 2015-06-10 872 88c9b70bb2b218 Gabriel Fernandez 2017-01-06 873 return stm32fx_end_primary_clk - 1 + hweight64(table[0]) + 358bdf892f6bfa Daniel Thompson 2015-06-10 874 (BIT_ULL_WORD(secondary) >= 1 ? hweight64(table[1]) : 0) + 358bdf892f6bfa Daniel Thompson 2015-06-10 875 (BIT_ULL_WORD(secondary) >= 2 ? hweight64(table[2]) : 0); 358bdf892f6bfa Daniel Thompson 2015-06-10 876 } 358bdf892f6bfa Daniel Thompson 2015-06-10 877 :::::: The code at line 871 was first introduced by commit :::::: 358bdf892f6bfacf20884b54a35ab038321f06f9 clk: stm32: Add clock driver for STM32F4[23]xxx devices :::::: TO: Daniel Thompson <daniel.thompson(a)linaro.org&gt; :::::: CC: Stephen Boyd <sboyd(a)codeaurora.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org