[ammarfaizi2-block:paulmck/linux-rcu/dave.2022.06.02a 56/78] kernel/rcu/tasks.h:1239:8: error: variable has incomplete type 'typeof (({
From: kernel test robot
Date: Thu Jun 02 2022 - 18:16:00 EST
tree: https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dave.2022.06.02a
head: 2efc5c4abe4cc1259378f7c1678a93540559673c
commit: cda3200416cdef7f25546cd6249fb411c8c32079 [56/78] rcu-tasks: Merge state into .b.need_qs and atomically update
config: arm-buildonly-randconfig-r004-20220531 (https://download.01.org/0day-ci/archive/20220603/202206030613.IxQYmIW8-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b364c76683f8ef241025a9556300778c07b590c2)
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/ammarfaizi2/linux-block/commit/cda3200416cdef7f25546cd6249fb411c8c32079
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dave.2022.06.02a
git checkout cda3200416cdef7f25546cd6249fb411c8c32079
# 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=arm SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All errors (new ones prefixed by >>):
In file included from kernel/rcu/update.c:606:
kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required
ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg'
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg'
__atomic_op_fence(arch_cmpxchg, __VA_ARGS__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic.h:73:9: note: expanded from macro '__atomic_op_fence'
typeof(op##_relaxed(args)) __ret; \
^~~~~~~~~~~~~~~~~~
<scratch space>:39:1: note: expanded from here
arch_cmpxchg_relaxed
^
arch/arm/include/asm/cmpxchg.h:212:26: note: expanded from macro 'arch_cmpxchg_relaxed'
(unsigned long)(o), \
^~~
In file included from kernel/rcu/update.c:606:
kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required
ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg'
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg'
__atomic_op_fence(arch_cmpxchg, __VA_ARGS__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic.h:73:9: note: expanded from macro '__atomic_op_fence'
typeof(op##_relaxed(args)) __ret; \
^~~~~~~~~~~~~~~~~~
<scratch space>:39:1: note: expanded from here
arch_cmpxchg_relaxed
^
arch/arm/include/asm/cmpxchg.h:213:26: note: expanded from macro 'arch_cmpxchg_relaxed'
(unsigned long)(n), \
^~~
In file included from kernel/rcu/update.c:606:
>> kernel/rcu/tasks.h:1239:8: error: variable has incomplete type 'typeof (({
}))' (aka 'void')
include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg'
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
^
include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg'
__atomic_op_fence(arch_cmpxchg, __VA_ARGS__)
^
include/linux/atomic.h:73:29: note: expanded from macro '__atomic_op_fence'
typeof(op##_relaxed(args)) __ret; \
^
In file included from kernel/rcu/update.c:606:
kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required
ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg'
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg'
__atomic_op_fence(arch_cmpxchg, __VA_ARGS__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic.h:75:10: note: expanded from macro '__atomic_op_fence'
__ret = op##_relaxed(args); \
^~~~~~~~~~~~~~~~~~
<scratch space>:40:1: note: expanded from here
arch_cmpxchg_relaxed
^
arch/arm/include/asm/cmpxchg.h:212:26: note: expanded from macro 'arch_cmpxchg_relaxed'
(unsigned long)(o), \
^~~
In file included from kernel/rcu/update.c:606:
kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required
ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg'
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg'
__atomic_op_fence(arch_cmpxchg, __VA_ARGS__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic.h:75:10: note: expanded from macro '__atomic_op_fence'
__ret = op##_relaxed(args); \
^~~~~~~~~~~~~~~~~~
<scratch space>:40:1: note: expanded from here
arch_cmpxchg_relaxed
^
arch/arm/include/asm/cmpxchg.h:213:26: note: expanded from macro 'arch_cmpxchg_relaxed'
(unsigned long)(n), \
^~~
5 errors generated.
vim +1239 kernel/rcu/tasks.h
1224
1225 /*
1226 * Do a cmpxchg() on ->trc_reader_special.b.need_qs, allowing for
1227 * the four-byte operand-size restriction of some platforms.
1228 * Returns the old value, which is often ignored.
1229 */
1230 u8 rcu_trc_cmpxchg_need_qs(struct task_struct *t, u8 old, u8 new)
1231 {
1232 union rcu_special ret;
1233 union rcu_special trs_old = READ_ONCE(t->trc_reader_special);
1234 union rcu_special trs_new = trs_old;
1235
1236 if (trs_old.b.need_qs != old)
1237 return trs_old.b.need_qs;
1238 trs_new.b.need_qs = new;
> 1239 ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new);
1240 return ret.b.need_qs;
1241 }
1242 EXPORT_SYMBOL_GPL(rcu_trc_cmpxchg_need_qs);
1243
--
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https://01.org/lkp