Re: [PATCH] mm: page-flags: fix build failure due to missing parameter for HasHWPoisoned flag

From: Matthew Wilcox
Date: Mon Nov 01 2021 - 16:46:51 EST


Should probbaly cc Linus, and also note that Stephen noticed & fixed
this problem already.
https://lore.kernel.org/lkml/20211101174846.2b1097d7@xxxxxxxxxxxxxxxx/

I didn't know about it at the time I sent the pull request because it
hadn't been merged at that point.

On Mon, Nov 01, 2021 at 12:43:36PM -0700, Yang Shi wrote:
> The below build failure when !CONFIG_MEMORY_FAILURE was reported for
> v5.16 merge window:
> In file included from include/linux/mmzone.h:22,
> from include/linux/gfp.h:6,
> from include/linux/slab.h:15,
> from include/linux/crypto.h:20,
> from arch/x86/kernel/asm-offsets.c:9:
> include/linux/page-flags.h:806:29: error: macro "PAGEFLAG_FALSE"
> requires 2 arguments, but only 1 given
> 806 | PAGEFLAG_FALSE(HasHWPoisoned)
> | ^
> include/linux/page-flags.h:411: note: macro "PAGEFLAG_FALSE" defined here
> 411 | #define PAGEFLAG_FALSE(uname, lname) TESTPAGEFLAG_FALSE(uname, lname) \
> |
> include/linux/page-flags.h:807:39: error: macro "TESTSCFLAG_FALSE"
> requires 2 arguments, but only 1 given
> 807 | TESTSCFLAG_FALSE(HasHWPoisoned)
> | ^
> include/linux/page-flags.h:414: note: macro "TESTSCFLAG_FALSE" defined here
> 414 | #define TESTSCFLAG_FALSE(uname, lname)
> \
> |
> include/linux/page-flags.h:806:1: error: unknown type name 'PAGEFLAG_FALSE'
> 806 | PAGEFLAG_FALSE(HasHWPoisoned)
> | ^~~~~~~~~~~~~~
> include/linux/page-flags.h:807:25: error: expected ';' before 'static'
> 807 | TESTSCFLAG_FALSE(HasHWPoisoned)
> | ^
> | ;
> ......
> 815 | static inline bool is_page_hwpoison(struct page *page)
> | ~~~~~~
> make[2]: *** [scripts/Makefile.build:121: arch/x86/kernel/asm-offsets.s] Error 1
>
> The commit d389a4a81155 ("mm: Add folio flag manipulation functions")
> changed the definition of PAGEFLAG macros, this caused the build failure
> for HasHWPoisoned flag. The new flag was introduced by commit
> eac96c3efdb5 ("mm: filemap: check if THP has hwpoisoned subpage for PMD
> page fault") in v5.15-rc7. But the folio series pull request was
> prepared before v5.15, so this new flag was missed.
>
> Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> Cc: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Cc: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
> Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
> ---
> include/linux/page-flags.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
> index d8623d6e1141..981341a3c3c4 100644
> --- a/include/linux/page-flags.h
> +++ b/include/linux/page-flags.h
> @@ -803,8 +803,8 @@ PAGEFLAG_FALSE(DoubleMap, double_map)
> PAGEFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND)
> TESTSCFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND)
> #else
> -PAGEFLAG_FALSE(HasHWPoisoned)
> - TESTSCFLAG_FALSE(HasHWPoisoned)
> +PAGEFLAG_FALSE(HasHWPoisoned, has_hwpoisoned)
> + TESTSCFLAG_FALSE(HasHWPoisoned, has_hwpoisoned)
> #endif
>
> /*
> --
> 2.26.2
>
>