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Wysocki" , Christian Brauner , "Darrick J. Wong" , Andrew Morton , "linux-xfs@vger.kernel.org" , "linux-pm@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [PATCH 0/2] Improve dmesg output for swapfile+hibernation Message-ID: References: <20240522074658.2420468-1-Sukrit.Bhatnagar@sony.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Stat-Signature: jksjgm7938oehnyxbjxgi7eb9jf693qb X-Rspamd-Queue-Id: ACAE7180020 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1716808829-786434 X-HE-Meta: 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 sPsfUfa2 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 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: List-Subscribe: List-Unsubscribe: On Mon, May 27, 2024 at 11:06:11AM +0000, Sukrit.Bhatnagar@sony.com wrote: > We can pass the starting physical block offset of a swapfile into > /sys/power/resume_offset, and hibernate can directly read/write > into it using the swap extents information created by iomap during > swapon. On resume, the kernel would read this offset value from > the commandline parameters, and then access the swapfile. Reading a physical address from userspace is not a proper interface. What is this code even trying to do with it?