linux-kernel - Re: [PATCH v8 02/10] Makefile: Prepare for using macros for inline asm

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Message-ID: <24BB4662-B220-4295-9040-17CF4C7B8CCE@zytor.com>
Date:   Wed, 03 Oct 2018 12:43:13 -0700
From:   hpa@...or.com
To:     Ingo Molnar <mingo@...nel.org>, Nadav Amit <namit@...are.com>
CC:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v8 02/10] Makefile: Prepare for using macros for inline asm

On October 2, 2018 3:59:52 AM PDT, Ingo Molnar <mingo@...nel.org> wrote:
>
>* Nadav Amit <namit@...are.com> wrote:
>
>> at 1:58 AM, Rasmus Villemoes <linux@...musvillemoes.dk> wrote:
>> 
>> > On 2018-09-18 23:28, Nadav Amit wrote:
>> > 
>> >> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
>> >> index 8f6e7eb8ae9f..944fa3bc9376 100644
>> >> --- a/arch/x86/Makefile
>> >> +++ b/arch/x86/Makefile
>> >> @@ -214,8 +214,8 @@ ifdef CONFIG_X86_64
>> >> KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000)
>> >> endif
>> >> 
>> >> -# Speed up the build
>> >> -KBUILD_CFLAGS += -pipe
>> >> +# We cannot use -pipe flag since we give an additional .s file to
>the compiler
>> >> +#KBUILD_CFLAGS += -pipe
>> > 
>> > Is this really necessary? The gas manual says that one can use --
>to
>> > name stdin, though that's probably a typo and should just be - .
>Doing
>> > 
>> > gcc -pipe -Wa,foo.s -Wa,-
>> 
>> Good idea. I didn’t think of it. Yes, this can do the trick. I’ll do
>it in
>> v9.
>
>Ok, will wait for v9.
>
>Thanks,
>
>	Ingo

Does -pipe actually win anything these days?
-- 
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