linux-kernel - Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE

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Message-ID: <CAK8P3a0-7LRE4ByO2Uf4tb5mR49SbZzBu0AgHpS=03FAMWFLgQ@mail.gmail.com>
Date:   Wed, 20 Mar 2019 10:38:38 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Dave Hansen <dave@...1.net>,
        Michael Ellerman <mpe@...erman.id.au>, X86 ML <x86@...nel.org>,
        linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...s.com>,
        Ingo Molnar <mingo@...hat.com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING

On Wed, Mar 20, 2019 at 7:41 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:

> It is unclear to me how to fix it.
> That's why I ended up with "depends on !MIPS".
>
>
>   MODPOST vmlinux.o
> arch/mips/mm/sc-mips.o: In function `mips_sc_prefetch_enable.part.2':
> sc-mips.c:(.text+0x98): undefined reference to `mips_gcr_base'
> sc-mips.c:(.text+0x9c): undefined reference to `mips_gcr_base'
> sc-mips.c:(.text+0xbc): undefined reference to `mips_gcr_base'
> sc-mips.c:(.text+0xc8): undefined reference to `mips_gcr_base'
> sc-mips.c:(.text+0xdc): undefined reference to `mips_gcr_base'
> arch/mips/mm/sc-mips.o:sc-mips.c:(.text.unlikely+0x44): more undefined
> references to `mips_gcr_base'
>
>
> Perhaps, MIPS folks may know how to fix it.

I would guess like this:

diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h
index 8bc5df49b0e1..a27483fedb7d 100644
--- a/arch/mips/include/asm/mips-cm.h
+++ b/arch/mips/include/asm/mips-cm.h
@@ -79,7 +79,7 @@ static inline int mips_cm_probe(void)
  *
  * Returns true if a CM is present in the system, else false.
  */
-static inline bool mips_cm_present(void)
+static __always_inline bool mips_cm_present(void)
 {
 #ifdef CONFIG_MIPS_CM
        return mips_gcr_base != NULL;
@@ -93,7 +93,7 @@ static inline bool mips_cm_present(void)
  *
  * Returns true if the system implements an L2-only sync region, else false.
  */
-static inline bool mips_cm_has_l2sync(void)
+static __always_inline bool mips_cm_has_l2sync(void)
 {
 #ifdef CONFIG_MIPS_CM
        return mips_cm_l2sync_base != NULL;