tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 372b2891c15acbf7b90d948b08ac174bde77102c commit: 3e7dd62254a2fb6ac472537cab3008cd3b6d6204 [8412/10077] ARC: cmpxchg/xchg: rewrite as macros to make type safe config: arc-randconfig-s032-20210825 (attached as .config) compiler: arceb-elf-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=3e7dd62254a2fb6ac472537cab3008cd3b6d6204 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 3e7dd62254a2fb6ac472537cab3008cd3b6d6204 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash arch/arc/kernel/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
sparse warnings: (new ones prefixed by >>)
arch/arc/kernel/smp.c:264:48: sparse: sparse: incorrect type in initializer
(different address spaces) @@ expected unsigned long [noderef] __percpu
*ipi_data_ptr @@ got unsigned long * @@
arch/arc/kernel/smp.c:264:48: sparse: expected unsigned long [noderef]
__percpu *ipi_data_ptr
arch/arc/kernel/smp.c:264:48: sparse: got unsigned long *
arch/arc/kernel/smp.c:279:18: sparse: sparse: incorrect type in argument 1
(different address spaces) @@ expected void const volatile *v @@ got
unsigned long [noderef] __percpu *__ai_ptr @@
arch/arc/kernel/smp.c:279:18: sparse: expected void const volatile *v
arch/arc/kernel/smp.c:279:18: sparse: got unsigned long [noderef]
__percpu *__ai_ptr
arch/arc/kernel/smp.c:277:29: sparse: sparse: cast removes address space
'__percpu' of expression
arch/arc/kernel/smp.c:413:72: sparse: sparse: incorrect type in argument 4
(different address spaces) @@ expected void [noderef] __percpu
*percpu_dev_id @@ got int *dev @@
arch/arc/kernel/smp.c:413:72: sparse: expected void [noderef] __percpu
*percpu_dev_id
arch/arc/kernel/smp.c:413:72: sparse: got int *dev
>> arch/arc/kernel/smp.c:279:18: sparse: sparse: dereference of noderef
>> expression
>> arch/arc/kernel/smp.c:279:18: sparse: sparse: dereference of noderef
>> expression
vim +279 arch/arc/kernel/smp.c
41195d236e8445 Vineet Gupta 2013-01-18 261
ddf84433f411b6 Vineet Gupta 2013-11-25 262 static void
ipi_send_msg_one(int cpu, enum ipi_msg_type msg)
41195d236e8445 Vineet Gupta 2013-01-18 263 {
f2a4aa5646687f Vineet Gupta 2013-11-26 264 unsigned long __percpu
*ipi_data_ptr = per_cpu_ptr(&ipi_data, cpu);
d8e8c7dda11f5d Vineet Gupta 2013-11-28 265 unsigned long old, new;
41195d236e8445 Vineet Gupta 2013-01-18 266 unsigned long flags;
41195d236e8445 Vineet Gupta 2013-01-18 267
f2a4aa5646687f Vineet Gupta 2013-11-26 268 pr_debug("%d Sending
msg [%d] to %d\n", smp_processor_id(), msg, cpu);
f2a4aa5646687f Vineet Gupta 2013-11-26 269
41195d236e8445 Vineet Gupta 2013-01-18 270 local_irq_save(flags);
41195d236e8445 Vineet Gupta 2013-01-18 271
d8e8c7dda11f5d Vineet Gupta 2013-11-28 272 /*
d8e8c7dda11f5d Vineet Gupta 2013-11-28 273 * Atomically write new
msg bit (in case others are writing too),
d8e8c7dda11f5d Vineet Gupta 2013-11-28 274 * and read back old
value
d8e8c7dda11f5d Vineet Gupta 2013-11-28 275 */
d8e8c7dda11f5d Vineet Gupta 2013-11-28 276 do {
6aa7de059173a9 Mark Rutland 2017-10-23 277 new = old =
READ_ONCE(*ipi_data_ptr);
d8e8c7dda11f5d Vineet Gupta 2013-11-28 278 new |= 1U <<
msg;
d8e8c7dda11f5d Vineet Gupta 2013-11-28 @279 } while
(cmpxchg(ipi_data_ptr, old, new) != old);
41195d236e8445 Vineet Gupta 2013-01-18 280
d8e8c7dda11f5d Vineet Gupta 2013-11-28 281 /*
d8e8c7dda11f5d Vineet Gupta 2013-11-28 282 * Call the platform
specific IPI kick function, but avoid if possible:
d8e8c7dda11f5d Vineet Gupta 2013-11-28 283 * Only do so if
there's no pending msg from other concurrent sender(s).
427df45f7baac5 Changcheng Deng 2021-08-14 284 * Otherwise, receiver
will see this msg as well when it takes the
d8e8c7dda11f5d Vineet Gupta 2013-11-28 285 * IPI corresponding to
that msg. This is true, even if it is already in
d8e8c7dda11f5d Vineet Gupta 2013-11-28 286 * IPI handler, because
!@old means it has not yet dequeued the msg(s)
d8e8c7dda11f5d Vineet Gupta 2013-11-28 287 * so @new msg can be a
free-loader
d8e8c7dda11f5d Vineet Gupta 2013-11-28 288 */
d8e8c7dda11f5d Vineet Gupta 2013-11-28 289 if
(plat_smp_ops.ipi_send && !old)
ddf84433f411b6 Vineet Gupta 2013-11-25 290
plat_smp_ops.ipi_send(cpu);
41195d236e8445 Vineet Gupta 2013-01-18 291
41195d236e8445 Vineet Gupta 2013-01-18 292
local_irq_restore(flags);
41195d236e8445 Vineet Gupta 2013-01-18 293 }
41195d236e8445 Vineet Gupta 2013-01-18 294
:::::: The code at line 279 was first introduced by commit
:::::: d8e8c7dda11f5d5cf90495f2e89d917a83509bc0 ARC: [SMP] optimize IPI send
and receive
:::::: TO: Vineet Gupta <vgu...@synopsys.com>
:::::: CC: Vineet Gupta <vgu...@synopsys.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
.config.gz
Description: application/gzip
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