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[104.155.91.135]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-485885bf3f0sm30012615f8f.33.2026.09.07.02.52.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Sep 2026 02:52:46 -0700 (PDT) Date: Mon, 7 Sep 2026 10:52:43 +0100 From: Vincent Donnefort To: Mike Rapoport Cc: catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, sudeep.holla@kernel.org, jenswi@kernel.org, robh@kernel.org, mark.rutland@arm.com, sumit.garg@kernel.org, ardb@kernel.org, thierry.reding@kernel.org, david@kernel.org, danielmentz@google.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, op-tee@lists.trustedfirmware.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v9 03/10] set_memory.h: Introduce can_set_direct_map_range() Message-ID: References: <20260902104712.2399797-1-vdonnefort@google.com> <20260902104712.2399797-4-vdonnefort@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 4CAD4160002 X-Stat-Signature: szbt7shbdz8p917urtxpha9x5zs9mcdf X-HE-Tag: 1788774769-47009 X-HE-Meta: U2FsdGVkX19BgFyivK9wytwViC3UJ2nKG2oS7pXbWrhSGmMNNFtEwIVl8hX8+4+ECnpHBiAs/YZQR45G1zS4aXr6vIxCBUoTOjjnLVHMDe7v3sTDKZwV7X5vrALHw8xkOmqOkT0spcTpPQeBLFXnkqvml23LQ6oAb7IFV2REBPpzknIjAHJd59gs1l/4Fg+BZOiRHmrbgR7UyvknaWLK1MWLGSaVWD8zE/5BmIwRWcRNFMpuwUfwHV7vsK4IDMdTvqcJuKhrLg6UPs6QTJiZY0VbfDclKySf/YyADDKZ8YL/gLNsRoE/kwLNU4NMo0N7Z04qPVO9Iqoj9N5/TEk+p+B9hfIXp5JbJGc1Hph5oxJ/zdXSqfCNsTFjarvjKlbv1gR+MYyrK0IWd9iZ4w/+rFh8WQHpm9U21ZOwEk2O2A1rhLnc+AfmTCq18YjQ9wu9GtDQ+bZYFMtLiaNejX9BNr7zlugSYnyJnbRDdqClRpn68vto9dgSh1LXiYCqYVVHDTHBWybxM+aDDl8NRmTtgmY2yPIaP+VgsKXkn9OcG0il9mvyZ/AXwwY+iKXfyfAw3NTNA5VHwApcfxyJvO3piJFSe0RSZYaKDmoPtZVUJ2kVIPXMwHUGeXQCHeRXsAXIp9OZvD3XKvIOqBFAwmU0RyPAdPCXOjTGa68joZXtVCTG2DhymF3m0NL0gnuNpdA8twP6UnD93NiWQ2Ychi8lB6VaYVbvaqa3bTXivUuPkTmpjfECfBxtpaB3i3jFAhHgOpLSq9HSG8Xwpx5r/yM7oxCJi5XbBZP4i4oe32Mn79mqMTpDJeNyKMQCsKnw11GleeVy9osDgg7dRLUPE/bo8ZCCBI4sR3sLYgGg1BRdAtGq0zC3trbhreGcUfSDRIihKDEoJAcFHR7BvinHilINXuao5dsN7+tC4ycQr3A1owgls2+rzm47BQptS1FBOHEzBmJDctZfcA9Spq5AS2E 5CEmuACN KQB+Yifwdz3uWECh+vLSrikusu/kKfcmjs1VpeSwaL2dKuDvZqcLV8XlCNzh5FzCXXNKLF6DgwkbpjiZmXEJkQw+4cgVCwFwVY0CLz16HNRYzzDoEqlVkmsPZEEkYfvGX9nO4KHUyQxAEEmLXyiumUARz8pPeZ1QA9Mcg7bj0oFri72mz0WCRRmYIxyECZmT6Q5eU30D825KOSeiANqAOGtKH7BhsQSP6L6Er7ajvr4V6NRDlI2lMbakkLOWrgQmeSaSaWWFaU8Kn7csEFCs4ySG2BMPSwhVHrawhjSHhyAYR6d6JJhYo8au5pgDEar+NB8Qm9jrp7k8ysqvaG8EwJt3y02AAtiBwcJ1tzbKOigwpkmBfF6zkuSJXN56o7EN69M+NAWjtbfr6+Q3TAvJXbqiqOlUovMvgGmrsMhTRGgSADBE= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Sep 06, 2026 at 10:39:02PM +0300, Mike Rapoport wrote: > On Wed, Sep 02, 2026 at 11:47:05AM +0100, Vincent Donnefort wrote: > > While can_set_direct_map() tells whether the direct map can be modified > > globally, can_set_direct_map_range() checks if a specific range can be > > modified. e.g. if mapped at PTE-level. > > set_direct_map are going to have number of pages parameter soon: > > https://lore.kernel.org/all/20260903-execmem-set-vm-perms-v0-2-v3-1-949b64a9f755@kernel.org > > so this check can be a part of arm64::set_direct_map ack. > > I wouldn't expose can_set_direct_map_range() as a public API and rely on > the callers to "Do The Right Thing". ack. Thanks for having a look at the series. -- Vincent > > > Signed-off-by: Vincent Donnefort > > > > diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h > > index 3030d9245f5a..88175c3fa751 100644 > > --- a/include/linux/set_memory.h > > +++ b/include/linux/set_memory.h > > @@ -44,6 +44,12 @@ static inline bool kernel_page_present(struct page *page) > > { > > return true; > > } > > + > > +static inline bool can_set_direct_map_range(struct page *page, > > + unsigned long nr_pages) > > +{ > > + return false; > > +} > > #else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */ > > /* > > * Some architectures, e.g. ARM64 can disable direct map modifications at > > @@ -56,6 +62,14 @@ static inline bool can_set_direct_map(void) > > } > > #define can_set_direct_map can_set_direct_map > > #endif > > + > > +#ifndef can_set_direct_map_range > > +static inline bool can_set_direct_map_range(struct page *page, unsigned long nr_pages) > > +{ > > + return can_set_direct_map(); > > +} > > +#define can_set_direct_map_range can_set_direct_map_range > > +#endif > > #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */ > > > > #ifdef CONFIG_X86_64 > > -- > > 2.55.0.970.g62bdec98f9-goog > > > > -- > Sincerely yours, > Mike.