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Date: Wed, 30 Nov 2016 17:41:58 -0500 (EST) From: Nicolas Pitre <nicolas.pitre@...aro.org> To: Linus Torvalds <torvalds@...ux-foundation.org> cc: Prarit Bhargava <prarit@...hat.com>, Jarod Wilson <jarod@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Tony Luck <tony.luck@...el.com>, zarniwhoop73@...glemail.com, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org> Subject: Re: Odd build breakage in 4.9-rc7 On Wed, 30 Nov 2016, Linus Torvalds wrote: > On Wed, Nov 30, 2016 at 10:50 AM, Prarit Bhargava <prarit@...hat.com> wrote: > > > > It comes back. The steps to reproduce this are: > > > > 1. checkout latest linux.git > > 2. make -j112 > > > > (IOW, it occurs 100% of the time for me on a clean tree.) I don't have access to such hardware where -j112 could ever make sense. :-) In other words, I can't reproduce regardless of the -j value I try. > I suspect it's not new, it's just that you are able to hit the timing > just right (and the new include presumable makes that just be much > easier). Here's the best fix I can think of. I can't convince myself any other location would be 100% safe. Obviously I can't confirm if this actually fixes anything. ----- >8 Subject: kbuild: make sure autoksyms.h exists early Some people are able to trigger a race where autoksyms.h is used before its empty version is even created. Let's create it at the same time as the directory holding it is created. Signed-off-by: Nicolas Pitre <nico@...aro.org> diff --git a/Makefile b/Makefile index 694111b43c..9f9c3b577c 100644 --- a/Makefile +++ b/Makefile @@ -1019,8 +1019,6 @@ prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ include/config/auto.conf $(cmd_crmodverdir) - $(Q)test -e include/generated/autoksyms.h || \ - touch include/generated/autoksyms.h archprepare: archheaders archscripts prepare1 scripts_basic diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile index ebced77deb..90a091b6ae 100644 --- a/scripts/kconfig/Makefile +++ b/scripts/kconfig/Makefile @@ -35,6 +35,8 @@ nconfig: $(obj)/nconf silentoldconfig: $(obj)/conf $(Q)mkdir -p include/config include/generated + $(Q)test -e include/generated/autoksyms.h || \ + touch include/generated/autoksyms.h $< $(silent) --$@ $(Kconfig) localyesconfig localmodconfig: $(obj)/streamline_config.pl $(obj)/conf
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