11:27 a.m.
tree:
https://github.com/0day-ci/linux/commits/UPDATE-20200520-041207/Zhou-Yanj...
head: 4fff52cd90c9406079cc6395408c8a56e7e4312d
commit: ad29da9806feb410651e7428a8ac27ab8f9104ff [1/6] MIPS: JZ4780: Introduce SMP
support.
config: mips-randconfig-r023-20200520 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project
e6658079aca6d971b4e9d7137a3a2ecbc9c34aec)
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
git checkout ad29da9806feb410651e7428a8ac27ab8f9104ff
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp(a)intel.com>
All warnings (new ones prefixed by >>, old ones prefixed by <<):
> arch/mips/kernel/idle.c:97:6: warning: no previous prototype for
function 'jz4780_smp_wait_irqoff' [-Wmissing-prototypes]
void
jz4780_smp_wait_irqoff(void)
^
arch/mips/kernel/idle.c:97:1: note: declare 'static' if the function is not
intended to be used outside of this translation unit
void jz4780_smp_wait_irqoff(void)
^
static
arch/mips/kernel/idle.c:155:13: warning: no previous prototype for function
'check_wait' [-Wmissing-prototypes]
void __init check_wait(void)
^
arch/mips/kernel/idle.c:155:1: note: declare 'static' if the function is not
intended to be used outside of this translation unit
void __init check_wait(void)
^
static
2 warnings generated.
vim +/jz4780_smp_wait_irqoff +97 arch/mips/kernel/idle.c
90
91 /*
92 * The Ingenic jz4780 SMP variant has to write back dirty cache lines before
93 * executing wait. The CPU & cache clock will be gated until we return from
94 * the wait, and if another core attempts to access data from our data cache
95 * during this time then it will lock up.
96 */
97 void jz4780_smp_wait_irqoff(void)
98 {
99 unsigned long pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
100
101 /*
102 * Going to idle has a significant overhead due to the cache flush so
103 * try to avoid it if we'll immediately be woken again due to an IRQ.
104 */
105 if (!need_resched() && !pending) {
106 r4k_blast_dcache();
107
108 __asm__(
109 " .set push \n"
110 " .set mips3 \n"
111 " sync \n"
112 " wait \n"
113 " .set pop \n");
114 }
115
116 local_irq_enable();
117 }
118
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org