linux-kernel - Re: [PATCH v7 4/4] powerpc: Book3S 64-bit "heavyweight" KASAN support

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Message-ID: <abcc9f7d-995d-e06e-ef04-1dbd144a38e0@c-s.fr>
Date:   Thu, 13 Feb 2020 12:36:28 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Daniel Axtens <dja@...ens.net>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        kasan-dev@...glegroups.com, aneesh.kumar@...ux.ibm.com,
        bsingharora@...il.com
Cc:     Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v7 4/4] powerpc: Book3S 64-bit "heavyweight" KASAN support



Le 13/02/2020 à 01:47, Daniel Axtens a écrit :
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 497b7d0b2d7e..f1c54c08a88e 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -169,7 +169,9 @@ config PPC
>   	select HAVE_ARCH_HUGE_VMAP		if PPC_BOOK3S_64 && PPC_RADIX_MMU
>   	select HAVE_ARCH_JUMP_LABEL
>   	select HAVE_ARCH_KASAN			if PPC32
> +	select HAVE_ARCH_KASAN			if PPC_BOOK3S_64 && PPC_RADIX_MMU

That's probably detail, but as it is necessary to deeply define the HW 
when selecting that (I mean giving the exact amount of memory and with 
restrictions like having a wholeblock memory), should it also depend of 
EXPERT ?

>   	select HAVE_ARCH_KASAN_VMALLOC		if PPC32
> +	select HAVE_ARCH_KASAN_VMALLOC		if PPC_BOOK3S_64 && PPC_RADIX_MMU

Maybe we could have

-  	select HAVE_ARCH_KASAN_VMALLOC		if PPC32
+	select HAVE_ARCH_KASAN_VMALLOC		if HAVE_ARCH_KASAN


>   	select HAVE_ARCH_KGDB
>   	select HAVE_ARCH_MMAP_RND_BITS
>   	select HAVE_ARCH_MMAP_RND_COMPAT_BITS	if COMPAT


Christophe