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SubjectRe: [PATCH V4 4/4] LoongArch: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
Hi, Arnd,

On Mon, Jul 4, 2022 at 8:18 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Mon, Jul 4, 2022 at 1:25 PM Huacai Chen <chenhuacai@loongson.cn> wrote:
> > To avoid the following build error on LoongArch we should include linux/
> > static_key.h in page-flags.h.
> >
> > In file included from ./include/linux/mmzone.h:22,
> > from ./include/linux/gfp.h:6,
> > from ./include/linux/mm.h:7,
> > from arch/loongarch/kernel/asm-offsets.c:9:
> > ./include/linux/page-flags.h:208:1: warning: data definition has no
> > type or storage class
> > 208 | DECLARE_STATIC_KEY_MAYBE(CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON,
> > | ^~~~~~~~~~~~~~~~~~~~~~~~
> > ./include/linux/page-flags.h:208:1: error: type defaults to 'int' in
> > declaration of 'DECLARE_STATIC_KEY_MAYBE' [-Werror=implicit-int]
> > ./include/linux/page-flags.h:209:26: warning: parameter names (without
> > types) in function declaration
>
> I wonder if page_fixed_fake_head() should be moved out of line to avoid
> this, it's already nontrivial here, and that would avoid the static key
> in a central header.
I have some consideration here. I think both inline function and
static key are instruments to make things faster, in other words,
page_fixed_fake_head() is a performance critical function. If so, it
is not suitable to move it out of line.

Huacai
>
> Arnd
>

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