linux-kernel - Re: [PATCH v12 01/28] mm: VM_SHADOW

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Message-ID: <7b6d895a-d19e-4f2c-8e12-6fe933b26189@ghiti.fr>
Date: Mon, 7 Apr 2025 17:45:13 +0200
From: Alexandre Ghiti <alex@...ti.fr>
To: Deepak Gupta <debug@...osinc.com>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...ux-foundation.org>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Christian Brauner <brauner@...nel.org>, Peter Zijlstra
 <peterz@...radead.org>, Oleg Nesterov <oleg@...hat.com>,
 Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
 Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
 Jann Horn <jannh@...gle.com>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
 alistair.francis@....com, richard.henderson@...aro.org, jim.shu@...ive.com,
 andybnac@...il.com, kito.cheng@...ive.com, charlie@...osinc.com,
 atishp@...osinc.com, evan@...osinc.com, cleger@...osinc.com,
 alexghiti@...osinc.com, samitolvanen@...gle.com, broonie@...nel.org,
 rick.p.edgecombe@...el.com, Zong Li <zong.li@...ive.com>
Subject: Re: [PATCH v12 01/28] mm: VM_SHADOW_STACK definition for riscv

Hi Deepak,

On 14/03/2025 22:39, Deepak Gupta wrote:
> VM_HIGH_ARCH_5 is used for riscv
>
> Reviewed-by: Zong Li <zong.li@...ive.com>
> Signed-off-by: Deepak Gupta <debug@...osinc.com>
> ---
>   include/linux/mm.h | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 7b1068ddcbb7..1ef231cbc8fe 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -378,6 +378,13 @@ extern unsigned int kobjsize(const void *objp);
>   # define VM_SHADOW_STACK	VM_HIGH_ARCH_6
>   #endif
>   
> +#if defined(CONFIG_RISCV_USER_CFI)
> +/*
> + * Following x86 and picking up the same bitpos.
> + */
> +# define VM_SHADOW_STACK	VM_HIGH_ARCH_5
> +#endif
> +
>   #ifndef VM_SHADOW_STACK
>   # define VM_SHADOW_STACK	VM_NONE
>   #endif
>

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex