linux-kernel - native_save_fl() causes a warning

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Date:   Fri, 3 Aug 2018 15:10:35 +0200
From:   Jean Delvare <jdelvare@...e.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alistair Strachan <astrachan@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Stellar <tstellar@...hat.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Juergen Gross <jgross@...e.com>, Ingo Molnar <mingo@...nel.org>
Subject: native_save_fl() causes a warning

Hi Nick,

It seems that this linux kernel commit of yours:

commit d0a8d9378d16eb3c69bd8e6d23779fbdbee3a8c7
Author: Nick Desaulniers
Date:   Thu Jun 21 09:23:24 2018 -0700

    x86/paravirt: Make native_save_fl() extern inline

introduced a new warning (with W=1):

./arch/x86/include/asm/irqflags.h:16:29: warning: no previous prototype for ‘native_save_fl’ [-Wmissing-prototypes]
 extern inline unsigned long native_save_fl(void)
                             ^

Please fix it.

Secondly, I am quite curious why you changed only native_save_fl() from
static inline to extern inline, when native_restore_fl(),
native_irq_disable() and native_irq_enable() are equally referenced by
address in arch/x86/kernel/paravirt.c and thus should suffer from the
same problem. Can you explain?

Thanks,
-- 
Jean Delvare
SUSE L3 Support