linux-kernel - Re: [PATCH] x86/asm: Remove unused COMPILE

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Date:   Mon, 28 Nov 2022 20:30:35 +0900
From:   Vincent MAILHOL <mailhol.vincent@...adoo.fr>
To:     kirill.shutemov@...ux.intel.com
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        jpoimboe@...nel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, pbonzini@...hat.com, rostedt@...dmis.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, seanjc@...gle.com,
        tglx@...utronix.de, viro@...iv.linux.org.uk, x86@...nel.org
Subject: Re: [PATCH] x86/asm: Remove unused COMPILE_OFFSETS macro from asm-offsets.c

On Mon. 28 Nov. 2022 at 20:11, <kirill.shutemov@...ux.intel.com> wrote:
> On Mon, Nov 28, 2022 at 07:11:17PM +0900, Vincent Mailhol wrote:
> > On Mon, 28 Nov 2022 12:15:06 +0300, Kirill A. Shutemov wrote:
> > > On Sun, Nov 27, 2022 at 03:23:35PM +0900, Vincent Mailhol wrote:
> > > > Following [1], the macro COMPILE_OFFSETS becomes unused:
> > >
> > > Really? I see #ifdef COMPILE_OFFSETS in ftrace.h. Hm?
> > >
> > > Have you tested your patch with CONFIG_FTRACE_SYSCALLS=y and
> > > CONFIG_IA32_EMULATION=y?
> >
> > Even if I activate those two configurations, the compiler still
> > tells me it is unused:
> >
> >   $ grep -E "CONFIG_FTRACE_SYSCALLS|CONFIG_IA32_EMULATION" .config
> >   CONFIG_IA32_EMULATION=y
> >   CONFIG_FTRACE_SYSCALLS=y
> >
> >   $ make W=2 arch/x86/kernel/asm-offsets.o
> >   <...>
> >   arch/x86/kernel/asm-offsets.c:7: warning: macro "COMPILE_OFFSETS" is not used [-Wunused-macros]
> >   <...>
>
> If you are sure <asm/ftrace.h> is never included from asm-offsets.c,
> remove #ifndef COMPILE_OFFSETS too.

It is never included from asm-offsets.c but it is still used by
kvm-asm-offsets.c:
https://elixir.bootlin.com/linux/v6.1-rc7/source/arch/x86/kvm/kvm-asm-offsets.c#L7