linux-kernel - Re: next-20160314 - KASAN breaks 'make C=2' build...

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Date:	Tue, 15 Mar 2016 12:22:18 +0300
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...r.kernel.org
Subject: Re: next-20160314 - KASAN breaks 'make C=2' build...

2016-03-15 12:11 GMT+03:00 Valdis Kletnieks <Valdis.Kletnieks@...edu>:
> This config breaks sparse:
>
> grep KASAN .config
> CONFIG_KASAN_SHADOW_OFFSET=0xdffffc0000000000
> CONFIG_HAVE_ARCH_KASAN=y
> CONFIG_KASAN=y
> # CONFIG_KASAN_OUTLINE is not set
> CONFIG_KASAN_INLINE=y
> CONFIG_TEST_KASAN=m
>
>  LANG=C make C=2
>   CHK     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
>   CHK     include/generated/utsrelease.h
>   CHK     include/generated/bounds.h
>   CHK     include/generated/timeconst.h
>   CHK     include/generated/asm-offsets.h
>   CALL    scripts/checksyscalls.sh
>   DESCEND  objtool
>   CHECK   scripts/mod/empty.c
> No such file: asan-stack=1
> scripts/Makefile.build:291: recipe for target 'scripts/mod/empty.o' failed
> make[2]: *** [scripts/mod/empty.o] Error 1
> scripts/Makefile.build:440: recipe for target 'scripts/mod' failed
> make[1]: *** [scripts/mod] Error 2
> Makefile:552: recipe for target 'scripts' failed
> make: *** [scripts] Error 2
>
> Looks like it's this chunk from scripts/Makefile.kasan:
>
> CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address
>                 -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET)
>                 --param asan-stack=1 --param asan-globals=1
>                 --param asan-instrumentation-with-call-threshold=$(call_threshold))
>
> 4AM is a bad time to figure out who's to blame here....

Update your sparse please. Make sure it has d917662d54ba ("lib.c: skip
--param parameters").