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[91.12.100.184]) by smtp.gmail.com with ESMTPSA id ju23sm1495102ejc.17.2021.04.21.00.49.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Apr 2021 00:49:03 -0700 (PDT) Subject: Re: [PATCH v2 4/4] arm64: drop pfn_valid_within() and simplify pfn_valid() To: Mike Rapoport , linux-arm-kernel@lists.infradead.org Cc: Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , Marc Zyngier , Mark Rutland , Mike Rapoport , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20210421065108.1987-1-rppt@kernel.org> <20210421065108.1987-5-rppt@kernel.org> From: David Hildenbrand Organization: Red Hat Message-ID: <24edab0c-226c-7ff6-2151-7a8b218c7c44@redhat.com> Date: Wed, 21 Apr 2021 09:49:01 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210421065108.1987-5-rppt@kernel.org> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: D8BBCC0007D3 X-Stat-Signature: kcgs6mh77mbwgdt83srzebdaconnonwd Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf14; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=170.10.133.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618991335-338779 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 21.04.21 08:51, Mike Rapoport wrote: > From: Mike Rapoport > > The arm64's version of pfn_valid() differs from the generic because of two > reasons: > > * Parts of the memory map are freed during boot. This makes it necessary to > verify that there is actual physical memory that corresponds to a pfn > which is done by querying memblock. > > * There are NOMAP memory regions. These regions are not mapped in the > linear map and until the previous commit the struct pages representing > these areas had default values. > > As the consequence of absence of the special treatment of NOMAP regions in > the memory map it was necessary to use memblock_is_map_memory() in > pfn_valid() and to have pfn_valid_within() aliased to pfn_valid() so that > generic mm functionality would not treat a NOMAP page as a normal page. > > Since the NOMAP regions are now marked as PageReserved(), pfn walkers and > the rest of core mm will treat them as unusable memory and thus > pfn_valid_within() is no longer required at all and can be disabled by > removing CONFIG_HOLES_IN_ZONE on arm64. > > pfn_valid() can be slightly simplified by replacing > memblock_is_map_memory() with memblock_is_memory(). > > Signed-off-by: Mike Rapoport > --- > arch/arm64/Kconfig | 3 --- > arch/arm64/mm/init.c | 4 ++-- > 2 files changed, 2 insertions(+), 5 deletions(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index e4e1b6550115..58e439046d05 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -1040,9 +1040,6 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK > def_bool y > depends on NUMA > > -config HOLES_IN_ZONE > - def_bool y > - > source "kernel/Kconfig.hz" > > config ARCH_SPARSEMEM_ENABLE > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c > index dc03bdc12c0f..eb3f56fb8c7c 100644 > --- a/arch/arm64/mm/init.c > +++ b/arch/arm64/mm/init.c > @@ -243,7 +243,7 @@ int pfn_valid(unsigned long pfn) > > /* > * ZONE_DEVICE memory does not have the memblock entries. > - * memblock_is_map_memory() check for ZONE_DEVICE based > + * memblock_is_memory() check for ZONE_DEVICE based > * addresses will always fail. Even the normal hotplugged > * memory will never have MEMBLOCK_NOMAP flag set in their > * memblock entries. Skip memblock search for all non early > @@ -254,7 +254,7 @@ int pfn_valid(unsigned long pfn) > return pfn_section_valid(ms, pfn); > } > #endif > - return memblock_is_map_memory(addr); > + return memblock_is_memory(addr); > } > EXPORT_SYMBOL(pfn_valid); > > Acked-by: David Hildenbrand -- Thanks, David / dhildenb