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Date: Thu, 25 Jun 2020 20:17:34 +0800
From: kernel test robot <lkp@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-kernel@...r.kernel.org,
"Paul E. McKenney" <paulmck@...nel.org>
Subject: [rcu:rcu/urgent 1/1] kernel/rcu/tree.c:253:8: error: implicit
declaration of function 'arch_atomic_add_return'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent
head: 239341154165cec3676955bab4cc1d61852257ed
commit: 239341154165cec3676955bab4cc1d61852257ed [1/1] rcu: Fixup noinstr warnings
config: s390-randconfig-r025-20200624 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 8911a35180c6777188fefe0954a2451a2b91deaf)
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 s390 cross compiling tool for clang build
# apt-get install binutils-s390-linux-gnu
git checkout 239341154165cec3676955bab4cc1d61852257ed
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
include/uapi/linux/swab.h:19:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
^
In file included from kernel/rcu/tree.c:50:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
^
In file included from kernel/rcu/tree.c:50:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
^
In file included from kernel/rcu/tree.c:50:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
^
In file included from kernel/rcu/tree.c:50:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32'
__fswab32(x))
^
In file included from kernel/rcu/tree.c:50:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:46: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew(cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:46: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> kernel/rcu/tree.c:253:8: error: implicit declaration of function 'arch_atomic_add_return' [-Werror,-Wimplicit-function-declaration]
seq = arch_atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
^
kernel/rcu/tree.c:253:8: note: did you mean 'atomic_add_return'?
arch/s390/include/asm/atomic.h:37:19: note: 'atomic_add_return' declared here
static inline int atomic_add_return(int i, atomic_t *v)
^
kernel/rcu/tree.c:277:8: error: implicit declaration of function 'arch_atomic_add_return' [-Werror,-Wimplicit-function-declaration]
seq = arch_atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
^
>> kernel/rcu/tree.c:283:3: error: implicit declaration of function 'arch_atomic_andnot' [-Werror,-Wimplicit-function-declaration]
arch_atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdp->dynticks);
^
kernel/rcu/tree.c:283:3: note: did you mean 'atomic_andnot'?
include/linux/atomic-fallback.h:652:1: note: 'atomic_andnot' declared here
atomic_andnot(int i, atomic_t *v)
^
>> kernel/rcu/tree.c:316:11: error: implicit declaration of function 'arch_atomic_read' [-Werror,-Wimplicit-function-declaration]
return !(arch_atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR);
^
kernel/rcu/tree.c:316:11: note: did you mean 'atomic_read'?
arch/s390/include/asm/atomic.h:20:19: note: 'atomic_read' declared here
static inline int atomic_read(const atomic_t *v)
^
20 warnings and 4 errors generated.
vim +/arch_atomic_add_return +253 kernel/rcu/tree.c
235
236 /*
237 * Record entry into an extended quiescent state. This is only to be
238 * called when not already in an extended quiescent state, that is,
239 * RCU is watching prior to the call to this function and is no longer
240 * watching upon return.
241 */
242 static noinstr void rcu_dynticks_eqs_enter(void)
243 {
244 struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
245 int seq;
246
247 /*
248 * CPUs seeing atomic_add_return() must see prior RCU read-side
249 * critical sections, and we also must force ordering with the
250 * next idle sojourn.
251 */
252 rcu_dynticks_task_trace_enter(); // Before ->dynticks update!
> 253 seq = arch_atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
254 // RCU is no longer watching. Better be in extended quiescent state!
255 WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
256 (seq & RCU_DYNTICK_CTRL_CTR));
257 /* Better not have special action (TLB flush) pending! */
258 WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
259 (seq & RCU_DYNTICK_CTRL_MASK));
260 }
261
262 /*
263 * Record exit from an extended quiescent state. This is only to be
264 * called from an extended quiescent state, that is, RCU is not watching
265 * prior to the call to this function and is watching upon return.
266 */
267 static noinstr void rcu_dynticks_eqs_exit(void)
268 {
269 struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
270 int seq;
271
272 /*
273 * CPUs seeing atomic_add_return() must see prior idle sojourns,
274 * and we also must force ordering with the next RCU read-side
275 * critical section.
276 */
277 seq = arch_atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
278 // RCU is now watching. Better not be in an extended quiescent state!
279 rcu_dynticks_task_trace_exit(); // After ->dynticks update!
280 WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
281 !(seq & RCU_DYNTICK_CTRL_CTR));
282 if (seq & RCU_DYNTICK_CTRL_MASK) {
> 283 arch_atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdp->dynticks);
284 smp_mb__after_atomic(); /* _exit after clearing mask. */
285 }
286 }
287
288 /*
289 * Reset the current CPU's ->dynticks counter to indicate that the
290 * newly onlined CPU is no longer in an extended quiescent state.
291 * This will either leave the counter unchanged, or increment it
292 * to the next non-quiescent value.
293 *
294 * The non-atomic test/increment sequence works because the upper bits
295 * of the ->dynticks counter are manipulated only by the corresponding CPU,
296 * or when the corresponding CPU is offline.
297 */
298 static void rcu_dynticks_eqs_online(void)
299 {
300 struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
301
302 if (atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR)
303 return;
304 atomic_add(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
305 }
306
307 /*
308 * Is the current CPU in an extended quiescent state?
309 *
310 * No ordering, as we are sampling CPU-local information.
311 */
312 static __always_inline bool rcu_dynticks_curr_cpu_in_eqs(void)
313 {
314 struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
315
> 316 return !(arch_atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR);
317 }
318
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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