linux-kernel - Re: [PATCH V2 4/4] LoongArch: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE

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Date:   Thu, 30 Jun 2022 08:06:39 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Huacai Chen <chenhuacai@...ngson.cn>
Cc:     Arnd Bergmann <arnd@...db.de>, Huacai Chen <chenhuacai@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, loongarch@...ts.linux.dev,
        linux-arch <linux-arch@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Feiyang Chen <chenfeiyang@...ngson.cn>
Subject: Re: [PATCH V2 4/4] LoongArch: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP

On Thu, Jun 30, 2022 at 6:32 AM Huacai Chen <chenhuacai@...ngson.cn> wrote:
>
> To avoid build error on LoongArch we should include linux/static_key.h
> in page-flags.h.

This is an expensive change in terms of compile speed, as static_key.h has
lots of dependencies, and page-flags.h is included in a lot of places. What
it is actually needed for?

         Arnd