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Date: Fri, 11 Nov 2022 06:21:22 +0800
From: kernel test robot <lkp@...el.com>
To: David Howells <dhowells@...hat.com>, willy@...radead.org
Cc: oe-kbuild-all@...ts.linux.dev, dhowells@...hat.com,
linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Make some folio and page function arguments const
and use bool
Hi David,
I love your patch! Perhaps something to improve:
[auto build test WARNING on akpm-mm/mm-everything]
url: https://github.com/intel-lab-lkp/linux/commits/David-Howells/mm-Make-some-folio-and-page-function-arguments-const-and-use-bool/20221111-012958
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/166810136860.3462948.16794726061248137027.stgit%40warthog.procyon.org.uk
patch subject: [PATCH] mm: Make some folio and page function arguments const and use bool
config: m68k-allyesconfig
compiler: m68k-linux-gcc (GCC) 12.1.0
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
# https://github.com/intel-lab-lkp/linux/commit/3fb73cfd420034dbced68189dcfd7fb204a9018d
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review David-Howells/mm-Make-some-folio-and-page-function-arguments-const-and-use-bool/20221111-012958
git checkout 3fb73cfd420034dbced68189dcfd7fb204a9018d
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k prepare
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
In file included from include/linux/percpu.h:5,
from include/linux/hrtimer.h:19,
from include/linux/sched.h:20,
from arch/m68k/kernel/asm-offsets.c:15:
include/linux/page-flags.h: In function 'const_folio_flags':
>> include/linux/page-flags.h:316:43: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
316 | VM_BUG_ON_PGFLAGS(PageTail(page), page);
| ^~~~
include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
21 | dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
| ^~~~
include/linux/page-flags.h:316:9: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
316 | VM_BUG_ON_PGFLAGS(PageTail(page), page);
| ^~~~~~~~~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:317:70: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
317 | VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
| ^~~~
include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
21 | dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
| ^~~~
include/linux/page-flags.h:317:9: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
317 | VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
| ^~~~~~~~~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
In file included from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/m68k/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from arch/m68k/include/asm/irqflags.h:6,
from include/linux/irqflags.h:16,
from arch/m68k/include/asm/atomic.h:6,
from include/linux/atomic.h:7,
from include/linux/rcupdate.h:25,
from include/linux/rculist.h:11,
from include/linux/pid.h:5,
from include/linux/sched.h:14:
include/linux/page-flags.h: In function 'PageLocked':
include/linux/page-flags.h:389:39: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~
include/linux/bitops.h:50:44: note: in definition of macro 'bitop'
50 | __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
| ^~~~
include/linux/page-flags.h:389:10: note: in expansion of macro 'test_bit'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~~~
include/linux/mmdebug.h:110:39: note: in expansion of macro 'VM_BUG_ON_PAGE'
110 | #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
| ^~~~~~~~~~~~~~
include/linux/page-flags.h:365:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
365 | VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:389:32: note: in expansion of macro 'PF_NO_TAIL'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~
include/linux/page-flags.h:439:9: note: in expansion of macro 'TESTPAGEFLAG'
439 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:479:1: note: in expansion of macro '__PAGEFLAG'
479 | __PAGEFLAG(Locked, locked, PF_NO_TAIL)
| ^~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:257:34: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
257 | #define compound_head(page) ((typeof(page))_compound_head(page))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bitops.h:50:44: note: in definition of macro 'bitop'
50 | __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
| ^~~~
include/linux/page-flags.h:389:10: note: in expansion of macro 'test_bit'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~~~
include/linux/mmdebug.h:110:39: note: in expansion of macro 'VM_BUG_ON_PAGE'
110 | #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
| ^~~~~~~~~~~~~~
include/linux/page-flags.h:357:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
357 | VM_BUG_ON_PGFLAGS(PagePoisoned(page), page); \
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:366:17: note: in expansion of macro 'PF_POISONED_CHECK'
366 | PF_POISONED_CHECK(compound_head(page)); })
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:366:35: note: in expansion of macro 'compound_head'
366 | PF_POISONED_CHECK(compound_head(page)); })
| ^~~~~~~~~~~~~
include/linux/page-flags.h:389:32: note: in expansion of macro 'PF_NO_TAIL'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~
include/linux/page-flags.h:439:9: note: in expansion of macro 'TESTPAGEFLAG'
439 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:479:1: note: in expansion of macro '__PAGEFLAG'
479 | __PAGEFLAG(Locked, locked, PF_NO_TAIL)
| ^~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:389:39: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~
include/linux/bitops.h:51:23: note: in definition of macro 'bitop'
--
In file included from include/linux/percpu.h:5,
from include/linux/percpu_counter.h:14,
from include/linux/mm_types.h:21,
from include/linux/buildid.h:5,
from include/linux/module.h:14,
from arch/m68k/kernel/ints.c:9:
include/linux/page-flags.h: In function 'const_folio_flags':
>> include/linux/page-flags.h:316:43: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
316 | VM_BUG_ON_PGFLAGS(PageTail(page), page);
| ^~~~
include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
21 | dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
| ^~~~
include/linux/page-flags.h:316:9: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
316 | VM_BUG_ON_PGFLAGS(PageTail(page), page);
| ^~~~~~~~~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:317:70: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
317 | VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
| ^~~~
include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
21 | dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
| ^~~~
include/linux/page-flags.h:317:9: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
317 | VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
| ^~~~~~~~~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
In file included from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/m68k/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from arch/m68k/include/asm/irqflags.h:6,
from include/linux/irqflags.h:16,
from arch/m68k/include/asm/atomic.h:6,
from include/linux/atomic.h:7,
from include/linux/mm_types_task.h:13,
from include/linux/mm_types.h:5:
include/linux/page-flags.h: In function 'PageLocked':
include/linux/page-flags.h:389:39: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~
include/linux/bitops.h:50:44: note: in definition of macro 'bitop'
50 | __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
| ^~~~
include/linux/page-flags.h:389:10: note: in expansion of macro 'test_bit'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~~~
include/linux/mmdebug.h:110:39: note: in expansion of macro 'VM_BUG_ON_PAGE'
110 | #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
| ^~~~~~~~~~~~~~
include/linux/page-flags.h:365:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
365 | VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:389:32: note: in expansion of macro 'PF_NO_TAIL'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~
include/linux/page-flags.h:439:9: note: in expansion of macro 'TESTPAGEFLAG'
439 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:479:1: note: in expansion of macro '__PAGEFLAG'
479 | __PAGEFLAG(Locked, locked, PF_NO_TAIL)
| ^~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:257:34: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
257 | #define compound_head(page) ((typeof(page))_compound_head(page))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bitops.h:50:44: note: in definition of macro 'bitop'
50 | __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
| ^~~~
include/linux/page-flags.h:389:10: note: in expansion of macro 'test_bit'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~~~
include/linux/mmdebug.h:110:39: note: in expansion of macro 'VM_BUG_ON_PAGE'
110 | #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
| ^~~~~~~~~~~~~~
include/linux/page-flags.h:357:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
357 | VM_BUG_ON_PGFLAGS(PagePoisoned(page), page); \
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:366:17: note: in expansion of macro 'PF_POISONED_CHECK'
366 | PF_POISONED_CHECK(compound_head(page)); })
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:366:35: note: in expansion of macro 'compound_head'
366 | PF_POISONED_CHECK(compound_head(page)); })
| ^~~~~~~~~~~~~
include/linux/page-flags.h:389:32: note: in expansion of macro 'PF_NO_TAIL'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~
include/linux/page-flags.h:439:9: note: in expansion of macro 'TESTPAGEFLAG'
439 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:479:1: note: in expansion of macro '__PAGEFLAG'
479 | __PAGEFLAG(Locked, locked, PF_NO_TAIL)
| ^~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:389:39: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~
include/linux/bitops.h:51:23: note: in definition of macro 'bitop'
51 | (uintptr_t)(addr) != (uintptr_t)NULL && \
| ^~~~
--
In file included from include/linux/percpu.h:5,
from include/linux/hrtimer.h:19,
from include/linux/sched.h:20,
from arch/m68k/kernel/vectors.c:20:
include/linux/page-flags.h: In function 'const_folio_flags':
>> include/linux/page-flags.h:316:43: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
316 | VM_BUG_ON_PGFLAGS(PageTail(page), page);
| ^~~~
include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
21 | dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
| ^~~~
include/linux/page-flags.h:316:9: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
316 | VM_BUG_ON_PGFLAGS(PageTail(page), page);
| ^~~~~~~~~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:317:70: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
317 | VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
| ^~~~
include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
21 | dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
| ^~~~
include/linux/page-flags.h:317:9: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
317 | VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
| ^~~~~~~~~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
In file included from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/m68k/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from arch/m68k/include/asm/irqflags.h:6,
from include/linux/irqflags.h:16,
from arch/m68k/include/asm/atomic.h:6,
from include/linux/atomic.h:7,
from include/linux/rcupdate.h:25,
from include/linux/rculist.h:11,
from include/linux/pid.h:5,
from include/linux/sched.h:14:
include/linux/page-flags.h: In function 'PageLocked':
include/linux/page-flags.h:389:39: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~
include/linux/bitops.h:50:44: note: in definition of macro 'bitop'
50 | __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
| ^~~~
include/linux/page-flags.h:389:10: note: in expansion of macro 'test_bit'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~~~
include/linux/mmdebug.h:110:39: note: in expansion of macro 'VM_BUG_ON_PAGE'
110 | #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
| ^~~~~~~~~~~~~~
include/linux/page-flags.h:365:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
365 | VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:389:32: note: in expansion of macro 'PF_NO_TAIL'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~
include/linux/page-flags.h:439:9: note: in expansion of macro 'TESTPAGEFLAG'
439 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:479:1: note: in expansion of macro '__PAGEFLAG'
479 | __PAGEFLAG(Locked, locked, PF_NO_TAIL)
| ^~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:257:34: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
257 | #define compound_head(page) ((typeof(page))_compound_head(page))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bitops.h:50:44: note: in definition of macro 'bitop'
50 | __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
| ^~~~
include/linux/page-flags.h:389:10: note: in expansion of macro 'test_bit'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~~~
include/linux/mmdebug.h:110:39: note: in expansion of macro 'VM_BUG_ON_PAGE'
110 | #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
| ^~~~~~~~~~~~~~
include/linux/page-flags.h:357:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
357 | VM_BUG_ON_PGFLAGS(PagePoisoned(page), page); \
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:366:17: note: in expansion of macro 'PF_POISONED_CHECK'
366 | PF_POISONED_CHECK(compound_head(page)); })
| ^~~~~~~~~~~~~~~~~
include/linux/page-flags.h:366:35: note: in expansion of macro 'compound_head'
366 | PF_POISONED_CHECK(compound_head(page)); })
| ^~~~~~~~~~~~~
include/linux/page-flags.h:389:32: note: in expansion of macro 'PF_NO_TAIL'
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~~~
include/linux/page-flags.h:439:9: note: in expansion of macro 'TESTPAGEFLAG'
439 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:479:1: note: in expansion of macro '__PAGEFLAG'
479 | __PAGEFLAG(Locked, locked, PF_NO_TAIL)
| ^~~~~~~~~~
include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
12 | void dump_page(struct page *page, const char *reason);
| ~~~~~~~~~~~~~^~~~
include/linux/page-flags.h:389:39: warning: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
389 | { return test_bit(PG_##lname, &policy(page, 0)->flags); }
| ^~~~
include/linux/bitops.h:51:23: note: in definition of macro 'bitop'
..
vim +316 include/linux/page-flags.h
311
312 static const unsigned long *const_folio_flags(const struct folio *folio, unsigned n)
313 {
314 const struct page *page = &folio->page;
315
> 316 VM_BUG_ON_PGFLAGS(PageTail(page), page);
317 VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);
318 return &page[n].flags;
319 }
320
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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