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[2003:cb:c70e:9c00:8d26:3031:d131:455c]) by smtp.gmail.com with ESMTPSA id 11-20020a05600c228b00b003f734ee1670sm1631931wmf.31.2023.06.07.03.22.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Jun 2023 03:22:43 -0700 (PDT) Message-ID: Date: Wed, 7 Jun 2023 12:22:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH] mm/mm_init.c: add debug messsge for dma zone To: Michal Hocko , Haifeng Xu Cc: rppt@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20230607090734.1259-1-haifeng.xu@shopee.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 6787F120010 X-Stat-Signature: cbj4xue5y6kjz88xzcq8tezc7nr4wr1b X-Rspam-User: X-HE-Tag: 1686133368-76640 X-HE-Meta: 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 hMrxBrdr AyX6oy0iTbupm0kaWuL61Ovf4+P3oigeYKVdpBVDDlEVMqsstoPeGHXqeY4PwRQRqR+kVB59ZVZEUflRrxQHKXo02fG3kwRgSUf+pPwldmn8P3zlFPa3M1orphDqKX2gBEsnG0cdKuQioWAn0fLl9geN7D7nwaQfVVHdjFEUNsarbP4ttaAe14+10ih/oYBggJfc8teCprJ6B1KvjJnwrLRB73fhKx1a8NMAAkabllqgQiAH271sMF5frtmuohXGHDXEWePJ0bXrp+kDQeZWinATOLSzcLrhxKedn2SoO40XnJ+UL/5XJ0mx0UsvtQVfJTzsoIc9JRfgklU9KALfmg/87RBGsZxqEq3vTCQee3YKcyP/YivTGBYGl5+Ykf98NCqAYorxM9zKADRvzmJHgjj7iaY32PURH4qFgG97wmF8EFiA= 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 07.06.23 12:16, Michal Hocko wrote: > On Wed 07-06-23 09:07:34, Haifeng Xu wrote: >> If freesize is less than dma_reserve, print warning message to report >> this case. > > Why? I'd like to second that question, and add a) Did you run into that scenario? b) What can an admin do in that case with that error messages? If it reveals a buggy situation, maybe a WARN_ON_ONCE() is warranted ... but maybe only if anybody actually ran into that issue. -- Cheers, David / dhildenb