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Subjectmm/compaction.c:463:20: warning: unused function 'isolation_suitable'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 5695e51619745d4fe3ec2506a2f0cd982c5e27a4
commit: 9df41314390b81a541ca6e84c8340bad0959e4b5 mm/compaction: do page isolation first in compaction
date: 2 months ago
config: mips-randconfig-r004-20210228 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 83bc7815c4235786111aa2abf7193292e4a602f5)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9df41314390b81a541ca6e84c8340bad0959e4b5
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9df41314390b81a541ca6e84c8340bad0959e4b5
# 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: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

mm/compaction.c:56:27: warning: unused variable 'HPAGE_FRAG_CHECK_INTERVAL_MSEC'
static const unsigned int HPAGE_FRAG_CHECK_INTERVAL_MSEC = 500;
^
>> mm/compaction.c:463:20: warning: unused function 'isolation_suitable'
static inline bool isolation_suitable(struct compact_control
^
>> mm/compaction.c:469:20: warning: unused function 'pageblock_skip_persistent'
static inline bool pageblock_skip_persistent(struct page
^
>> mm/compaction.c:474:20: warning: unused function 'update_pageblock_skip'
static inline void update_pageblock_skip(struct compact_control
^
fatal error: error in backend: Nested variants found in inline asm string: ' .set push
.set noat
.set push
.set arch=r4000
.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/cmpxchg.h", .line = 163, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
1: ll $0, $2 # __cmpxchg_asm
bne $0, ${3:z}, 2f
.set pop
move $$1, ${4:z}
.set arch=r4000
sc $$1, $1
beqz $$1, 1b
.set pop
2: .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/cmpxchg.h", .line = 163, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
'
clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 13.0.0 (git://gitmirror/llvm_project e0b1df924ae06d6d88582334087d2eacc6702e8f)
Target: mipsel-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/cross/clang-e0b1df924a/bin
clang-13: note: diagnostic msg:
Makefile arch block certs crypto drivers fs include init ipc kernel lib mm net scripts security sound source usr virt


vim +/isolation_suitable +463 mm/compaction.c

e380bebe477154 Mel Gorman 2019-03-05 440
bb13ffeb9f6bfe Mel Gorman 2012-10-08 441 /*
bb13ffeb9f6bfe Mel Gorman 2012-10-08 442 * If no pages were isolated then mark this pageblock to be skipped in the
62997027ca5b3d Mel Gorman 2012-10-08 443 * future. The information is later cleared by __reset_isolation_suitable().
bb13ffeb9f6bfe Mel Gorman 2012-10-08 444 */
c89511ab2f8fe2 Mel Gorman 2012-10-08 445 static void update_pageblock_skip(struct compact_control *cc,
d097a6f6352254 Mel Gorman 2019-03-05 446 struct page *page, unsigned long pfn)
bb13ffeb9f6bfe Mel Gorman 2012-10-08 447 {
c89511ab2f8fe2 Mel Gorman 2012-10-08 448 struct zone *zone = cc->zone;
6815bf3f233e0b Joonsoo Kim 2013-12-18 449
2583d6713267a4 Vlastimil Babka 2017-11-17 450 if (cc->no_set_skip_hint)
6815bf3f233e0b Joonsoo Kim 2013-12-18 451 return;
6815bf3f233e0b Joonsoo Kim 2013-12-18 452
bb13ffeb9f6bfe Mel Gorman 2012-10-08 453 if (!page)
bb13ffeb9f6bfe Mel Gorman 2012-10-08 454 return;
bb13ffeb9f6bfe Mel Gorman 2012-10-08 455
bb13ffeb9f6bfe Mel Gorman 2012-10-08 456 set_pageblock_skip(page);
c89511ab2f8fe2 Mel Gorman 2012-10-08 457
35979ef3393110 David Rientjes 2014-06-04 458 /* Update where async and sync compaction should restart */
35979ef3393110 David Rientjes 2014-06-04 459 if (pfn < zone->compact_cached_free_pfn)
c89511ab2f8fe2 Mel Gorman 2012-10-08 460 zone->compact_cached_free_pfn = pfn;
c89511ab2f8fe2 Mel Gorman 2012-10-08 461 }
bb13ffeb9f6bfe Mel Gorman 2012-10-08 462 #else
bb13ffeb9f6bfe Mel Gorman 2012-10-08 @463 static inline bool isolation_suitable(struct compact_control *cc,
bb13ffeb9f6bfe Mel Gorman 2012-10-08 464 struct page *page)
bb13ffeb9f6bfe Mel Gorman 2012-10-08 465 {
bb13ffeb9f6bfe Mel Gorman 2012-10-08 466 return true;
bb13ffeb9f6bfe Mel Gorman 2012-10-08 467 }
bb13ffeb9f6bfe Mel Gorman 2012-10-08 468
b527cfe5bc2320 Vlastimil Babka 2017-11-17 @469 static inline bool pageblock_skip_persistent(struct page *page)
21dc7e023611fb David Rientjes 2017-11-17 470 {
21dc7e023611fb David Rientjes 2017-11-17 471 return false;
21dc7e023611fb David Rientjes 2017-11-17 472 }
21dc7e023611fb David Rientjes 2017-11-17 473
21dc7e023611fb David Rientjes 2017-11-17 @474 static inline void update_pageblock_skip(struct compact_control *cc,
d097a6f6352254 Mel Gorman 2019-03-05 475 struct page *page, unsigned long pfn)
e380bebe477154 Mel Gorman 2019-03-05 476 {
e380bebe477154 Mel Gorman 2019-03-05 477 }
e380bebe477154 Mel Gorman 2019-03-05 478

:::::: The code at line 463 was first introduced by commit
:::::: bb13ffeb9f6bfeb301443994dfbf29f91117dfb3 mm: compaction: cache if a pageblock was scanned and no pages were isolated

:::::: TO: Mel Gorman <mgorman@suse.de>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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