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Wed, 14 Aug 2019 17:53:26 +0000 From: Steve Capper To: Mark Rutland Subject: Re: [PATCH] arm64: fix CONFIG_KASAN_SW_TAGS && CONFIG_KASAN_INLINE (was: Re: [PATCH V5 03/12] arm64: kasan: Switch to using) KASAN_SHADOW_OFFSET Thread-Topic: [PATCH] arm64: fix CONFIG_KASAN_SW_TAGS && CONFIG_KASAN_INLINE (was: Re: [PATCH V5 03/12] arm64: kasan: Switch to using) KASAN_SHADOW_OFFSET Thread-Index: AQHVUrPR87Jl8IRCOE2i9pzbGg2dt6b6zHWAgAABvQCAAB68AA== Date: Wed, 14 Aug 2019 17:53:26 +0000 Message-ID: <20190814175324.GA12635@capper-ampere.manchester.arm.com> References: <20190807155524.5112-1-steve.capper@arm.com> <20190807155524.5112-4-steve.capper@arm.com> <20190814152017.GD51963@lakrids.cambridge.arm.com> <20190814155711.ldwot7ezrrqjlswc@willie-the-truck> <20190814160324.GE51963@lakrids.cambridge.arm.com> In-Reply-To: <20190814160324.GE51963@lakrids.cambridge.arm.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mutt/1.10.1 (2018-07-13) x-originating-ip: [217.140.106.32] x-clientproxiedby: LO2P265CA0339.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:d::15) To DB8PR08MB4105.eurprd08.prod.outlook.com (2603:10a6:10:b0::12) Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Steve.Capper@arm.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Aug 14, 2019 at 05:03:24PM +0100, Mark Rutland wrote: > On Wed, Aug 14, 2019 at 04:57:11PM +0100, Will Deacon wrote: > > On Wed, Aug 14, 2019 at 04:20:18PM +0100, Mark Rutland wrote: > > > On Wed, Aug 07, 2019 at 04:55:15PM +0100, Steve Capper wrote: > > > > diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile > > > > index b2400f9c1213..2b7db0d41498 100644 > > > > --- a/arch/arm64/Makefile > > > > +++ b/arch/arm64/Makefile > > > > @@ -126,14 +126,6 @@ KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) > > > > KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) > > > > KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) > > > > > > > > -# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) > > > > -# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) > > > > -# in 32-bit arithmetic > > > > -KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \ > > > > - (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 1 - 32))) \ > > > > - + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \ > > > > - - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) ) > > > > - > > > > export TEXT_OFFSET GZFLAGS > > > > > > > > core-y += arch/arm64/kernel/ arch/arm64/mm/ > > > > > > I've just spotted this breaks build using CONFIG_KASAN_SW_TAGS && > > > CONFIG_KASAN_INLINE, as scripts/Makefile.kasan only propagates > > > CONFIG_KASAN_SHADOW_OFFSET into KASAN_SHADOW_OFFSET when > > > CONFIG_KASAN_GENERIC is selected, but consumes KASAN_SHADOW_OFFSET > > > regardless. > > > > > > I think that's by accident rather than by design, but to > > > minimize/localize the fixup, how about the below? I can send a cleanup > > > patch for scripts/Makefile.kasan later. > > > > How much work is that? I've dropped this stuff from -next for now, so we > > have time to fix it properly as long as it's not going to take weeks. > > I wrote it first, so no effort; patch below. > > Andrey, would you be happy with this? > > Thanks, > Mark. FWIW, this one worked well for me too (52-bit VA runtime, SW TAGS + GENERIC both inlined). Tested-by: Steve Capper Cheers, -- Steve _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel