linux-kernel - Re: [PATCH v9 02/10] Makefile: Prepare for using macros for inline asm

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Date:   Tue, 6 Nov 2018 19:18:10 +0000
From:   Nadav Amit <namit@...are.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        Ingo Molnar <mingo@...hat.com>
CC:     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>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v9 02/10] Makefile: Prepare for using macros for inline
 asm

From: Logan Gunthorpe
Sent: November 6, 2018 at 6:57:57 PM GMT
> To: Nadav Amit <namit@...are.com>, Ingo Molnar <mingo@...hat.com>
> Cc: linux-kernel@...r.kernel.org>, x86@...nel.org>, Sam Ravnborg <sam@...nborg.org>, Michal Marek <michal.lkml@...kovi.net>, Thomas Gleixner <tglx@...utronix.de>, H. Peter Anvin <hpa@...or.com>, linux-kbuild@...r.kernel.org>, Stephen Bates <sbates@...thlin.com>
> Subject: Re: [PATCH v9 02/10] Makefile: Prepare for using macros for inline asm
> 
> 
> 
> 
> On 2018-10-03 3:30 p.m., Nadav Amit wrote:
>> +ASM_MACRO_FLAGS = -Wa,arch/x86/kernel/macros.s -Wa,-
>> +export ASM_MACRO_FLAGS
>> +KBUILD_CFLAGS += $(ASM_MACRO_FLAGS)
> 
> I'm not sure how much we care about this or what we can do about it, but
> adding the macros.s to the command line like this has effectively broken
> distributed compiling with distcc and icecc as of v4.20-rc1. Neither
> tool will successfully distribute any compile processes because the
> non-local machines won't have a copy of macros.s.

Err.. I don’t have a dist-cc environment. I wonder whether something like
that would do the trick:

-- >8 —

Subject: [PATCH] x86: Fix dist-cc

---
 arch/x86/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 5b562e464009..81d76cbcffff 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -237,9 +237,9 @@ archheaders:
 	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
 
 archmacros:
-	$(Q)$(MAKE) $(build)=arch/x86/kernel arch/x86/kernel/macros.s
+	$(Q)$(MAKE) $(build)=arch/x86/kernel ${objtree}/arch/x86/kernel/macros.s
 
-ASM_MACRO_FLAGS = -Wa,arch/x86/kernel/macros.s -Wa,-
+ASM_MACRO_FLAGS = -Wa,${objtree}/arch/x86/kernel/macros.s -Wa,-
 export ASM_MACRO_FLAGS
 KBUILD_CFLAGS += $(ASM_MACRO_FLAGS)
 
-- 
2.17.1