[RESEND,PATCH] ARM: fix __div64_32() error when compiling with clang
kernel test robot
lkp at intel.com
Tue Nov 24 18:16:53 EST 2020
Hi Antony,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.10-rc5 next-20201124]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Antony-Yu/ARM-fix-__div64_32-error-when-compiling-with-clang/20201123-154454
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 418baf2c28f3473039f2f7377760bd8f6897ae18
config: arm-randconfig-r036-20201124 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project df9ae5992889560a8f3c6760b54d5051b47c7bf5)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://github.com/0day-ci/linux/commit/83df1f983ed4219556020bf30cc819e66bb7e69c
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Antony-Yu/ARM-fix-__div64_32-error-when-compiling-with-clang/20201123-154454
git checkout 83df1f983ed4219556020bf30cc819e66bb7e69c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>
All errors (new ones prefixed by >>):
drivers/tty/serial/imx.c:359:19: warning: unused function 'imx_uart_is_imx21' [-Wunused-function]
static inline int imx_uart_is_imx21(struct imx_port *sport)
^
drivers/tty/serial/imx.c:364:19: warning: unused function 'imx_uart_is_imx53' [-Wunused-function]
static inline int imx_uart_is_imx53(struct imx_port *sport)
^
drivers/tty/serial/imx.c:369:19: warning: unused function 'imx_uart_is_imx6q' [-Wunused-function]
static inline int imx_uart_is_imx6q(struct imx_port *sport)
^
In file included from drivers/tty/serial/imx.c:11:
In file included from include/linux/module.h:12:
In file included from include/linux/list.h:9:
In file included from include/linux/kernel.h:19:
>> arch/arm/include/asm/div64.h:39:2: error: multiple outputs to hard register: r0
asm( __asmeq("%0", __xh)
^
3 warnings and 1 error generated.
--
In file included from drivers/gpu/drm/tegra/dc.c:7:
In file included from include/linux/clk.h:13:
In file included from include/linux/kernel.h:19:
>> arch/arm/include/asm/div64.h:39:2: error: multiple outputs to hard register: r0
asm( __asmeq("%0", __xh)
^
1 error generated.
vim +39 arch/arm/include/asm/div64.h
^1da177e4c3f415 include/asm-arm/div64.h Linus Torvalds 2005-04-16 32
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 33 static inline uint32_t __div64_32(uint64_t *n, uint32_t base)
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 34 {
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 35 register unsigned int __base asm("r4") = base;
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 36 register unsigned long long __n asm("r0") = *n;
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 37 register unsigned long long __res asm("r2");
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 38 register unsigned int __rem asm(__xh);
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 @39 asm( __asmeq("%0", __xh)
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 40 __asmeq("%1", "r2")
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 41 __asmeq("%2", "r0")
83df1f983ed4219 arch/arm/include/asm/div64.h Antony Yu 2020-11-23 42 __asmeq("%3", "r0")
83df1f983ed4219 arch/arm/include/asm/div64.h Antony Yu 2020-11-23 43 __asmeq("%4", "r4")
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 44 "bl __do_div64"
83df1f983ed4219 arch/arm/include/asm/div64.h Antony Yu 2020-11-23 45 : "=r" (__rem), "=r" (__res), "=r" (__n)
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 46 : "r" (__n), "r" (__base)
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 47 : "ip", "lr", "cc");
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 48 *n = __res;
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 49 return __rem;
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 50 }
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 51 #define __div64_32 __div64_32
040b323b5012b55 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 52
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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