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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776154504; bh=i+61MYwPhyBU9c2P6PAHwEwjeACa/kQ2i7soG6qp95o=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=OMCkt5VjSw6kunvIIqZ5OYLfnoIvIQ8TBCG06q1EoPeLYvh7fia6rjTK7MCT1AYhO mwz/6KJOe98IMgnm3lpvLQ5tKWZKZ2QGtjhl5F/IMgm/rKKyvjYsFwubauGFtR+/p9 GsHxJQuE3R4+sq7g47rBbDOpxpHIL9ZPoGYKjaheuLzvY/6xHLh7z/MoxMCgo9zvhi +CmhxEARIuy5IbMpPW1d5e7FJN+faRgWl8LAy5RBqoKYEeCYWwZnfvLBJrNSEc4eU6 gLh48F3XacTq72Ikk6Nwfe6GSMfMNQTXlOYflZUshbcfStdNlNYa9CyEqDC7tJjWQr b1FrDQTMndxiQ== Message-ID: Date: Tue, 14 Apr 2026 10:14:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm: fix mmap errno value when MAP_DROPPABLE is not supported To: anthony.yznaga@oracle.com, Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com, shuah@kernel.org References: <20260402003417.438037-1-anthony.yznaga@oracle.com> <20260402003417.438037-2-anthony.yznaga@oracle.com> <20260401174440.0f85ea303f0a027b50d99e5d@linux-foundation.org> <2f59c4e3-303f-4e13-a0a5-e1b5e5c1a37f@oracle.com> <43370425-00b0-4853-bc82-63064eae2b8e@oracle.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: uwgjeq45ruqnk3c5nyzokop93kph8rdo X-Rspamd-Queue-Id: D2C6E100002 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1776154504-83025 X-HE-Meta: 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 DexmJzvw GkXMx+vqI686YbZ2OQb6ZhUS0ddeuI7UVqXsja10yGoshmnV9E6FE4ZzB0PO5UQi5dp01xwsDwhOA3t10yGMsw/WKuoy92S4ay81ceuylXsYdltuToC6uk+WmN4dSclCJ1Uf1bTP1SqxkTq9uxIkOfdwkxZUqyzE9UuBEuonNVzZFVa+vlBQJybEiwm73hkzU7KyyYgrzGOiDgCJNrrvRUaR0tXQkDG1oAzQ312NbJJZPWJQQ7D4qxpNfGSTL+KfmOUq4F9hisW3xNL1shvEIfBpiGyKL3y/bEv8NHA5r9YTl3BPLrzDqN8/p5umCwME2Tzr4m48dWB9WDYogha91lp+iOao6MUKlLglNNSV1sp81e1jhuwi+FJlKiXCVSXoqPk5R Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/14/26 02:43, anthony.yznaga@oracle.com wrote: > > On 4/2/26 4:13 PM, anthony.yznaga@oracle.com wrote: >> >> On 4/2/26 12:17 AM, David Hildenbrand (Arm) wrote: >>> >>> Acked-by: David Hildenbrand (Arm) >>> >>> >>> But >>> >>> ~/git/linux/mm$ git grep ENOTSUPP >>> hugetlb_vmemmap.c:                      ret = -ENOTSUPP; >>> mmap.c:                         return -ENOTSUPP; >>> >>> >>> Should we fix up the other one as well? >>> >> I'm looking into this. It's returned for the case where vmemmap >> mappings cannot be split/freed because they are self-hosted due to >> memory hotplug. Many callers end up ignoring the error, but there may >> be a way for it to be propagated to userspace as the errno for a >> failed write to a sysfs file. > > To follow up on this, the ENOTSUPP returned by vmemmap_pmd_entry is not > propagated to user space.  It is used internally to ensure > HPG_vmemmap_optimized is cleared for a hugetlb folio when HVO cannot be > applied due to the vmemmap memory being self-hosted. Thanks for checking, it indeed propagates a bit but never seems to leave the file. It would probably still be better to just clean that one up as well. -- Cheers, David