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Wed, 8 Jul 2026 07:38:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783496296; bh=1y4jc2fBbDjyCrVGAy6/YgB+rmoA+uy8MNL/iS7r1vQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=iRkeyb0p2wqqTAQJyNyGAumfISj9bl3bMW9XFVv2w5TZLSDK+k2q9sQvUE9+Zb0iX A3p3DuU5foVBM/LFlq37Yd+z8E4kSlHhYhfnoRLuoLXq4f/j1bgBOd9CSlJVCwPKRf fooj/5P8YFzYdxa5lrUODecDyNFKqWtHZnBf3/1pF6oUKbH8GcTfkRpztAckO6WKMa Uitenc22fKTlEplnUXz/S7nF9xs7jzUbAlZwYosLEfsXh5T/JFF+nyB5xpdyw3bL0j iq53ZXJ2aOMOLCh46AoJVqVNmaPtQkmAqhvXP2tWn5d4aqjWGYALuWyDjrV2sOiIb/ KOP87SvcBZbNA== Message-ID: Date: Wed, 8 Jul 2026 09:38:10 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] selftests/mm: handle EINVAL when configuring gigantic hugepages To: Sayali Patil , Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org, Miaohe Lin , Venkat Rao Bagalkote References: <2e3b585cbb30b2fc495dcd49d75de6f6da61861c.1783446924.git.sayalip@linux.ibm.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 On 7/8/26 08:59, Sayali Patil wrote: > Some MM selftests attempt to configure the amount of > HugeTLB pages of different sizes by writing to nr_hugepages. > > PowerPC hash MMU pSeries systems advertise gigantic hugepage sizes > but do not support runtime allocation of such pages, writes > to the corresponding nr_hugepages file fail with -EINVAL. > This causes the test to bail out even though the failure is due > to a platform limitation rather than the > functionality being tested. > > Ignore -EINVAL when configuring nr_hugepages so that tests continue to > run on systems where gigantic hugepage allocation is unsupported. > > Before patch: > ------------------------- > running ./hugetlb-madvise > ------------------------- > TAP version 13 > 1..1 > [INFO] detected hugetlb page size: 16777216 KiB > [INFO] detected hugetlb page size: 16384 KiB > ok 1 MADV_DONTNEED and MADV_REMOVE on hugetlb > Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 > Bail out! /sys/kernel/mm/hugepages/hugepages-16777216kB/nr_hugepages > write(0) failed: Invalid argument > Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 > [FAIL] > > After patch: > ------------------------- > running ./hugetlb-madvise > ------------------------- > TAP version 13 > 1..1 > [INFO] detected hugetlb page size: 16777216 KiB > [INFO] detected hugetlb page size: 16384 KiB > ok 1 MADV_DONTNEED and MADV_REMOVE on hugetlb > Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 > [PASS] > > Fixes: 27477b28b74f ("selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages") > Co-developed-by: David Hildenbrand (Arm) > Signed-off-by: David Hildenbrand (Arm) > Signed-off-by: Sayali Patil LGTM. Using proper flags would maybe be nicer, but no need for that for this corner case for now. -- Cheers, David