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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775053413; bh=6VHZQdVcweUnK/eBmrW7ZqmrS1qt6jitIGklQQlSOfI=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=gCltjpPqUrkUauJrDpAxOiS72XBVBRF0NIOdSjUwJB4A2Msa+j63e7I2+6XGBDfPI Qg+UlNp77GoNiEq9KISRwkEOkw1xR5F3M3CYFCDzhUSL6Xy5nN415BhEphEpAMhbed OS33ZBSPmNCu+w6HAj5fLvbZFGbfJxYQd/FqN6igVmyMkif0IWW2vGN8VO4UYs+3WT GlUx8ByO7kdPe1Tk8bnt4kNCVkmmyzgTwxyCanh6wM9CHF6y2JhDsRLk24kuMkZ4sL JcWaI5Z0+LAzd49vQzKWX4j5M4FdDYGaibl6qSYe0AajTlk99PVpKPZAUhgp3N7+Rr hai4g5YzrC93g== Message-ID: <455a3f72-a513-4fe5-8b8d-31d07cb3b0a7@kernel.org> Date: Wed, 1 Apr 2026 16:23:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 10/13] selftests/mm: skip uffd-stress test when nr_pages_per_cpu is zero 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, Venkat Rao Bagalkote References: <0a4106d7c594c5bb471a48ca37348883e204d295.1774591179.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 X-Stat-Signature: ric4m77a1656in57866134imj34t1y6k X-Rspamd-Queue-Id: C982B120012 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1775053414-396809 X-HE-Meta: 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 kIxH3YsQ u0SGHgEXD/R47UhXMffH0ybi+P8M0yWIjznV1c9XbUtifzTXUtI/1zeq9Rk6Vzt3ZegHIYte8ZPpmDmLWoAEDIBX0D6wbjBR/TGda/gtUVz8csGP578wxKucfGhbTc3ZDsXBBb1Zny2vFJ9I5RTg4eKfhPEKPnMCjTRAQLTUA9kDpF4Z0aQsrBttdeXPTMLinOVlQk1tja1Xqs4rHU+hBTAY5df5FUyBHWacx9A04ixFEIqDftihtdnw0Us4JAo+gFzf1BD9kfM/LJe/mo0n9WdqjqKM8gnDH28oJP9YW/q9wOhRgLukYkgFXjtTnHrX9p+kQElx74N7uaa9UnxjO8OjjjY2M/YjY2WtDaqQVpk6COsXwiitsVKps2iprPA0rqQIz6bevCilgNkDLca+zMMtDbtJKI/FnREmGvt471PJqPJWxo91rgg1/D55xVQeIM5ie Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/27/26 08:16, Sayali Patil wrote: > uffd-stress currently fails when the computed nr_pages_per_cpu > evaluates to zero: > > nr_pages_per_cpu = bytes / page_size / nr_parallel > > This can occur on systems with large hugepage sizes (e.g. 1GB) and a > high number of CPUs, where the total allocated memory is sufficient > overall but not enough to provide at least one page per cpu. > > In such cases, the failure is due to insufficient test resources > rather than incorrect kernel behaviour. Update the test > to treat this condition as a test skip instead of reporting an error. > > Fixes: db0f1c138f18 ("selftests/mm: print some details when uffd-stress gets bad params") > Acked-by: Zi Yan > Tested-by: Venkat Rao Bagalkote > Signed-off-by: Sayali Patil Acked-by: David Hildenbrand (Arm) -- Cheers, David