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b=b+dMyBHR6oRMk34jYJ5+9hacn+vl4i1HjkIPv1VdV5hCcpOveE1k5rHWYZP61ieb8 lSPbvU43se8+w/uZKjFucWKa6QWOcFQHbUSv3osbRweZaZzBxF2KtyLss3gOf8WlkE x8s2dvTpbY0NpBBgVv8zOFzuccrAjYLHMy8cSIXCzRxfQbhx+YOhMA4EW9hccdMDQX yuRDK6VHPKv8P/D6uQKOuiccx2+s713o5GAmFuyPEKSWaxGBy7/oB0/u5raXeJ/KmX 1ccIijXynm3jy2p7h2cH+Az7bsSvtwfLAdcVeHiHKPfWaAVV+wzzmglsG+bLMhBf/B bxNI5Sn2wa+2Q== Message-ID: Date: Tue, 16 Jun 2026 17:41:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v8 02/24] set_memory: Introduce set_memory_pkey() stub To: Kevin Brodsky , linux-hardening@vger.kernel.org Cc: Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner References: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> <20260526-kpkeys-v8-2-eaaacdacc67c@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 30D821A0009 X-Stat-Signature: kzo33r6gu3m74x811yg9mmohb5zy5axf X-HE-Tag: 1781624473-943810 X-HE-Meta: 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 knbvQ/2u igdO3GhpWWxcO2mtGXzhj5jm3q0vUtEDeKQhkCyRF9BKl3eNE23Hyc2z25iAOzTG0xQ5S8mN15Rj7C0DNGWLxOMA9gUDkrFRRebnuEvXyCfXQHWzQ6MlxYet6FltDpZTfW/QYqofLU88wTC2LhA613HzDgjolki1gu/nD3hVUOP7GODOgadC/mCaQDLCOGUBqbC7Hm00IMLRF8BuCGnhGk8fKCZRyKjZ1zmktnZ/WCg6Od169MjrTAx+9/feX1MsIbW4uwYks9LIBMDjrpvYa9YmEiP42iRSv7ZH+XruBiLNqnosPBO3GFHVX0n8VxtphYQTsICst1ZDdJX3ErU6ncrp4bkDKhfUQXxFPEXNNyUD9iKA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/26/26 13:15, Kevin Brodsky wrote: > Introduce a new function, set_memory_pkey(), which sets the > protection key (pkey) of pages in the specified linear mapping > range. Architectures implementing kernel pkeys (kpkeys) must > provide a suitable implementation; an empty stub is added as > fallback. > > Signed-off-by: Kevin Brodsky > --- > include/linux/set_memory.h | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h > index 3030d9245f5a..7b3a8bfde3c6 100644 > --- a/include/linux/set_memory.h > +++ b/include/linux/set_memory.h > @@ -84,4 +84,11 @@ static inline int set_memory_decrypted(unsigned long addr, int numpages) > } > #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ > > +#ifndef CONFIG_ARCH_HAS_KPKEYS > +static inline int set_memory_pkey(unsigned long addr, int numpages, int pkey) > +{ > + return 0; > +} > +#endif > + > #endif /* _LINUX_SET_MEMORY_H_ */ > This patch looks rather odd, given that this is just a stub that won't be used before patch #20. And there, it's only used from arm64 code? So why do we need the common-code stub? -- Cheers, David