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Subjectfs/f2fs/gc.c:622:12: warning: stack frame size of 3056 bytes in function 'get_victim_by_default'
Hi Chao,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 996e435fd401de35df62ac943ab9402cfe85c430
commit: 093749e296e29a4b0162eb925a6701a01e8c9a98 f2fs: support age threshold based garbage collection
date: 4 months ago
config: powerpc-randconfig-r033-20210109 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project bc556e5685c0f97e79fb7b3c6f15cc5062db8e36)
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 powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=093749e296e29a4b0162eb925a6701a01e8c9a98
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 093749e296e29a4b0162eb925a6701a01e8c9a98
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc

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 >>):

arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:182:1: note: expanded from here
__do_insw
^
arch/powerpc/include/asm/io.h:542:56: note: expanded from macro '__do_insw'
#define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from fs/f2fs/gc.c:10:
In file included from include/linux/backing-dev.h:15:
In file included from include/linux/blkdev.h:13:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:10:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:184:1: note: expanded from here
__do_insl
^
arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insl'
#define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from fs/f2fs/gc.c:10:
In file included from include/linux/backing-dev.h:15:
In file included from include/linux/blkdev.h:13:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:10:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:186:1: note: expanded from here
__do_outsb
^
arch/powerpc/include/asm/io.h:544:58: note: expanded from macro '__do_outsb'
#define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from fs/f2fs/gc.c:10:
In file included from include/linux/backing-dev.h:15:
In file included from include/linux/blkdev.h:13:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:10:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:188:1: note: expanded from here
__do_outsw
^
arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsw'
#define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from fs/f2fs/gc.c:10:
In file included from include/linux/backing-dev.h:15:
In file included from include/linux/blkdev.h:13:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:10:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:190:1: note: expanded from here
__do_outsl
^
arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsl'
#define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
>> fs/f2fs/gc.c:622:12: warning: stack frame size of 3056 bytes in function 'get_victim_by_default' [-Wframe-larger-than=]
static int get_victim_by_default(struct f2fs_sb_info *sbi,
^
13 warnings generated.


vim +/get_victim_by_default +622 fs/f2fs/gc.c

093749e296e29a4 Chao Yu 2020-08-04 613
0a8165d7c2cf139 Jaegeuk Kim 2012-11-29 614 /*
111d2495a8a8fbd Masanari Iida 2013-03-19 615 * This function is called from two paths.
7bc0900347e069a Jaegeuk Kim 2012-11-02 616 * One is garbage collection and the other is SSR segment selection.
7bc0900347e069a Jaegeuk Kim 2012-11-02 617 * When it is called during GC, it just gets a victim segment
7bc0900347e069a Jaegeuk Kim 2012-11-02 618 * and it does not remove it from dirty seglist.
7bc0900347e069a Jaegeuk Kim 2012-11-02 619 * When it is called from SSR segment selection, it finds a segment
7bc0900347e069a Jaegeuk Kim 2012-11-02 620 * which has minimum valid blocks and removes it from dirty seglist.
7bc0900347e069a Jaegeuk Kim 2012-11-02 621 */
7bc0900347e069a Jaegeuk Kim 2012-11-02 @622 static int get_victim_by_default(struct f2fs_sb_info *sbi,
093749e296e29a4 Chao Yu 2020-08-04 623 unsigned int *result, int gc_type, int type,
093749e296e29a4 Chao Yu 2020-08-04 624 char alloc_mode, unsigned long long age)
7bc0900347e069a Jaegeuk Kim 2012-11-02 625 {
7bc0900347e069a Jaegeuk Kim 2012-11-02 626 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 627 struct sit_info *sm = SIT_I(sbi);
7bc0900347e069a Jaegeuk Kim 2012-11-02 628 struct victim_sel_policy p;
3fa565039e3338f Sheng Yong 2016-09-29 629 unsigned int secno, last_victim;
04f0b2eaa3b3ee2 Qiuyang Sun 2019-06-05 630 unsigned int last_segment;
093749e296e29a4 Chao Yu 2020-08-04 631 unsigned int nsearched;
093749e296e29a4 Chao Yu 2020-08-04 632 bool is_atgc;
97767500781fae9 Qilong Zhang 2020-06-28 633 int ret = 0;
7bc0900347e069a Jaegeuk Kim 2012-11-02 634
210f41bc048263d Chao Yu 2014-09-15 635 mutex_lock(&dirty_i->seglist_lock);
04f0b2eaa3b3ee2 Qiuyang Sun 2019-06-05 636 last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
210f41bc048263d Chao Yu 2014-09-15 637
7bc0900347e069a Jaegeuk Kim 2012-11-02 638 p.alloc_mode = alloc_mode;
093749e296e29a4 Chao Yu 2020-08-04 639 p.age = age;
093749e296e29a4 Chao Yu 2020-08-04 640 p.age_threshold = sbi->am.age_threshold;
7bc0900347e069a Jaegeuk Kim 2012-11-02 641
093749e296e29a4 Chao Yu 2020-08-04 642 retry:
093749e296e29a4 Chao Yu 2020-08-04 643 select_policy(sbi, gc_type, type, &p);
7bc0900347e069a Jaegeuk Kim 2012-11-02 644 p.min_segno = NULL_SEGNO;
093749e296e29a4 Chao Yu 2020-08-04 645 p.oldest_age = 0;
3fa565039e3338f Sheng Yong 2016-09-29 646 p.min_cost = get_max_cost(sbi, &p);
7bc0900347e069a Jaegeuk Kim 2012-11-02 647
093749e296e29a4 Chao Yu 2020-08-04 648 is_atgc = (p.gc_mode == GC_AT || p.alloc_mode == AT_SSR);
093749e296e29a4 Chao Yu 2020-08-04 649 nsearched = 0;
093749e296e29a4 Chao Yu 2020-08-04 650
093749e296e29a4 Chao Yu 2020-08-04 651 if (is_atgc)
093749e296e29a4 Chao Yu 2020-08-04 652 SIT_I(sbi)->dirty_min_mtime = ULLONG_MAX;
093749e296e29a4 Chao Yu 2020-08-04 653
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 654 if (*result != NULL_SEGNO) {
97767500781fae9 Qilong Zhang 2020-06-28 655 if (!get_valid_blocks(sbi, *result, false)) {
97767500781fae9 Qilong Zhang 2020-06-28 656 ret = -ENODATA;
97767500781fae9 Qilong Zhang 2020-06-28 657 goto out;
97767500781fae9 Qilong Zhang 2020-06-28 658 }
97767500781fae9 Qilong Zhang 2020-06-28 659
97767500781fae9 Qilong Zhang 2020-06-28 660 if (sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
97767500781fae9 Qilong Zhang 2020-06-28 661 ret = -EBUSY;
97767500781fae9 Qilong Zhang 2020-06-28 662 else
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 663 p.min_segno = *result;
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 664 goto out;
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 665 }
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 666
97767500781fae9 Qilong Zhang 2020-06-28 667 ret = -ENODATA;
3342bb303bf48dd Chao Yu 2015-10-05 668 if (p.max_search == 0)
3342bb303bf48dd Chao Yu 2015-10-05 669 goto out;
3342bb303bf48dd Chao Yu 2015-10-05 670
e3080b0120a15e6 Chao Yu 2018-10-24 671 if (__is_large_section(sbi) && p.alloc_mode == LFS) {
e3080b0120a15e6 Chao Yu 2018-10-24 672 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
e3080b0120a15e6 Chao Yu 2018-10-24 673 p.min_segno = sbi->next_victim_seg[BG_GC];
e3080b0120a15e6 Chao Yu 2018-10-24 674 *result = p.min_segno;
e3080b0120a15e6 Chao Yu 2018-10-24 675 sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
e3080b0120a15e6 Chao Yu 2018-10-24 676 goto got_result;
e3080b0120a15e6 Chao Yu 2018-10-24 677 }
e3080b0120a15e6 Chao Yu 2018-10-24 678 if (gc_type == FG_GC &&
e3080b0120a15e6 Chao Yu 2018-10-24 679 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
e3080b0120a15e6 Chao Yu 2018-10-24 680 p.min_segno = sbi->next_victim_seg[FG_GC];
e3080b0120a15e6 Chao Yu 2018-10-24 681 *result = p.min_segno;
e3080b0120a15e6 Chao Yu 2018-10-24 682 sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
e3080b0120a15e6 Chao Yu 2018-10-24 683 goto got_result;
e3080b0120a15e6 Chao Yu 2018-10-24 684 }
e3080b0120a15e6 Chao Yu 2018-10-24 685 }
e3080b0120a15e6 Chao Yu 2018-10-24 686
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 687 last_victim = sm->last_victim[p.gc_mode];
7bc0900347e069a Jaegeuk Kim 2012-11-02 688 if (p.alloc_mode == LFS && gc_type == FG_GC) {
7bc0900347e069a Jaegeuk Kim 2012-11-02 689 p.min_segno = check_bg_victims(sbi);
7bc0900347e069a Jaegeuk Kim 2012-11-02 690 if (p.min_segno != NULL_SEGNO)
7bc0900347e069a Jaegeuk Kim 2012-11-02 691 goto got_it;
7bc0900347e069a Jaegeuk Kim 2012-11-02 692 }
7bc0900347e069a Jaegeuk Kim 2012-11-02 693
7bc0900347e069a Jaegeuk Kim 2012-11-02 694 while (1) {
da52f8ade40b032 Jack Qiu 2020-06-18 695 unsigned long cost, *dirty_bitmap;
da52f8ade40b032 Jack Qiu 2020-06-18 696 unsigned int unit_no, segno;
da52f8ade40b032 Jack Qiu 2020-06-18 697
da52f8ade40b032 Jack Qiu 2020-06-18 698 dirty_bitmap = p.dirty_bitmap;
da52f8ade40b032 Jack Qiu 2020-06-18 699 unit_no = find_next_bit(dirty_bitmap,
da52f8ade40b032 Jack Qiu 2020-06-18 700 last_segment / p.ofs_unit,
da52f8ade40b032 Jack Qiu 2020-06-18 701 p.offset / p.ofs_unit);
da52f8ade40b032 Jack Qiu 2020-06-18 702 segno = unit_no * p.ofs_unit;
a43f7ec327b0d86 Chao Yu 2015-10-05 703 if (segno >= last_segment) {
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 704 if (sm->last_victim[p.gc_mode]) {
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 705 last_segment =
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 706 sm->last_victim[p.gc_mode];
e066b83c9b40f3a Jaegeuk Kim 2017-04-13 707 sm->last_victim[p.gc_mode] = 0;
7bc0900347e069a Jaegeuk Kim 2012-11-02 708 p.offset = 0;
7bc0900347e069a Jaegeuk Kim 2012-11-02 709 continue;
7bc0900347e069a Jaegeuk Kim 2012-11-02 710 }
7bc0900347e069a Jaegeuk Kim 2012-11-02 711 break;
7bc0900347e069a Jaegeuk Kim 2012-11-02 712 }
a57e564d14d9d12 Jin Xu 2013-09-13 713
a57e564d14d9d12 Jin Xu 2013-09-13 714 p.offset = segno + p.ofs_unit;
688159b6db47a9e Fan Li 2016-02-03 715 nsearched++;
688159b6db47a9e Fan Li 2016-02-03 716

:::::: The code at line 622 was first introduced by commit
:::::: 7bc0900347e069a1676d28ad6f98cafaf8cfd6e9 f2fs: add garbage collection functions

:::::: TO: Jaegeuk Kim <jaegeuk.kim@samsung.com>
:::::: CC: Jaegeuk Kim <jaegeuk.kim@samsung.com>

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