From: Nick Desaulniers <ndesaulniers@google.com>
To: David.Laight@aculab.com
Cc: mingo@redhat.com, Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
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andrea.parri@amarulasolutions.com
Subject: Re: [PATCH v6 3/3] x86: paravirt: make native_save_fl extern inline
Date: Mon, 16 Jul 2018 10:27:04 -0700 [thread overview]
Message-ID: <CAKwvOdmFVnSos71vAUnayuocBDhxLg76tvGF0y3sj+4+s7TCcw@mail.gmail.com> (raw)
In-Reply-To: <1e19dbef068b45a4a4e9eb4072e097be@AcuMS.aculab.com>
On Fri, Jul 13, 2018 at 3:15 AM David Laight <David.Laight@aculab.com> wrote:
>
> From: Nick Desaulniers
> > Sent: 21 June 2018 17:23
> >
> > native_save_fl() is marked static inline, but by using it as
> > a function pointer in arch/x86/kernel/paravirt.c, it MUST be outlined.
> >
> > paravirt's use of native_save_fl() also requires that no GPRs other than
> > %rax are clobbered.
> ...
> > diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
> > index 89f08955fff7..c4fc17220df9 100644
> > --- a/arch/x86/include/asm/irqflags.h
> > +++ b/arch/x86/include/asm/irqflags.h
> > @@ -13,7 +13,7 @@
> > * Interrupt control:
> > */
> >
> > -static inline unsigned long native_save_fl(void)
> > +extern inline unsigned long native_save_fl(void)
>
> This is generating a the compilation warning (that we treat as an error):
> "no previous prototype for 'native_save_fl".
> Fixable by replicating the line with an appended ;
Thanks for the report and sorry for breaking things for you. Just
curious about more information to try to reproduce the issue to make
sure I fix the issue correctly:
* What compiler and compiler version are you using?
* Are you setting any configs or enabling any warning CFLAGS to see this?
* Do you see this warning for other `extern inline` functions? (It
seems like the few other ones in the kernel are for non-x86 archs)
I would have guessed that extern inline functions with gnu_inline
semantics (gnu89 behavior) should not have a previous declaration, but
it probably doesn't hurt to add it.
--
Thanks,
~Nick Desaulniers
prev parent reply other threads:[~2018-07-16 17:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-21 16:23 [PATCH v6 0/3] extern inline native_save_fl for paravirt Nick Desaulniers
2018-06-21 16:23 ` [PATCH v6 1/3] compiler-gcc.h: add gnu_inline to all inline declarations Nick Desaulniers
2018-07-03 15:59 ` [tip:x86/urgent] compiler-gcc.h: Add __attribute__((gnu_inline)) " tip-bot for Nick Desaulniers
2018-06-21 16:23 ` [PATCH v6 2/3] x86/asm: add _ASM_ARG* constants for argument registers to <asm/asm.h> Nick Desaulniers
2018-07-03 15:59 ` [tip:x86/urgent] x86/asm: Add " tip-bot for H. Peter Anvin
2018-06-21 16:23 ` [PATCH v6 3/3] x86: paravirt: make native_save_fl extern inline Nick Desaulniers
2018-06-22 2:24 ` Ingo Molnar
2018-06-22 17:10 ` Nick Desaulniers
2018-06-26 7:13 ` Ingo Molnar
2018-06-26 16:22 ` Nick Desaulniers
2018-07-03 7:21 ` Juergen Gross
2018-07-03 16:00 ` [tip:x86/urgent] x86/paravirt: Make native_save_fl() " tip-bot for Nick Desaulniers
[not found] ` <1e19dbef068b45a4a4e9eb4072e097be@AcuMS.aculab.com>
2018-07-16 17:27 ` Nick Desaulniers [this message]
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