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SubjectRe: [PATCH] rcu-tasks: Make RCU Tasks Trace checking for userspace execution
Hi Zqiang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on paulmck-rcu/dev]
[also build test ERROR on linus/master v5.19-rc6 next-20220715]
[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]

base: dev
config: hexagon-randconfig-r041-20220717 (
compiler: clang version 15.0.0 ( 45067f8fbf61284839c739807c2da2e2505661eb)
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git remote add linux-review
git fetch --no-tags linux-review Zqiang/rcu-tasks-Make-RCU-Tasks-Trace-checking-for-userspace-execution/20220717-223556
git checkout d078656cad783fefa6506b05e7dfd1ce43f23eb0
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <>

All errors (new ones prefixed by >>):

In file included from kernel/rcu/tree.c:4638:
>> kernel/rcu/tree_plugin.h:979:3: error: call to undeclared function 'rcu_tasks_trace_qs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1 error generated.

vim +/rcu_tasks_trace_qs +979 kernel/rcu/tree_plugin.h

960 /*
961 * Check to see if this CPU is in a non-context-switch quiescent state,
962 * namely user mode and idle loop.
963 */
964 static void rcu_flavor_sched_clock_irq(int user)
965 {
966 if (user || rcu_is_cpu_rrupt_from_idle()) {
968 /*
969 * Get here if this CPU took its interrupt from user
970 * mode or from the idle loop, and if this is not a
971 * nested interrupt. In this case, the CPU is in
972 * a quiescent state, so note it.
973 *
974 * No memory barrier is required here because rcu_qs()
975 * references only CPU-local variables that other CPUs
976 * neither access nor modify, at least not while the
977 * corresponding CPU is online.
978 */
> 979 rcu_tasks_trace_qs(current);
980 rcu_qs();
981 }
982 }

0-DAY CI Kernel Test Service

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