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U2FsdGVkX1+Oqby/SO7PAOvAGJrHLEia6U3Y72w0NCe3EcV9usmTo5g2Q2fbPphC5cYPQ/5z1VJe5B3e88RLeLtR2eB2vIDGolKSpCbagc2L68RBEyFgAKvnLB2DsYgFjpQWkhcQq+3KgLWbxE2wNE2AMcfZa4z+yYXZYyLFAU2DuIYELi05HVdgt1YQQeFR6gVkecXeaDh2zSDyCZuBixnzDmQ54v0bJm/Pnh/EoCzRmMRqyaIRcEQdcHOnnpLErkZ79spg7OoOB4t0qXc4t26eQ+Cr00IoQUBMrjNHNgIwH999PAkbtwKWD7GcTfvsFZVwmruNiDp2+kFZWgTp1sd86ViQprywpgBd+WM4kPjX1hoJQdWcq0h20/F2k8atJswfc9eVYTkEKwqoSR6pSmNqHARJZFOlWzp9Pcn+lHry6zbZlxqapLoR1MYhK4ynqp39oljCG9IbCjNcnP5DCW76nSZDw+7D2gDM2/QaxYYLPdQgI+ujlXtHSswIA1/Ae3hY0uuMqBaAyoI1K76L4xKy5FdJ6Yg6ev547NPM7zGAnVDkxGyg/eUvR4rzkUZzt5H9SVDLNNPKD0hmfh930VejdNpnGzzcE9OspV+6/g/txu4YulpTj4EtOWBpSF6aocrm2HhoVehbX1qgCWXa8pUWt9ckLBrFxwjcUg+3gwfEDsY0m3g/8+EM7T2PWtBPzVYz/Jfk7wiIAxHG7sv2Aq87mBW8ampSeahfen4Xg9oAC8O9mTnISHb014YyEEl/7pVEv9EEA7/S6nE4S7hGXkHDVWlLYHl+j8XC3xb1rSZu/zZOt4JItRrTFG0D7/CeLh3n0GKjKS3FSd9CWVfY32KRYZOqjO8Da7eX+Pj+n+d49vZjB48Od4uIJexgYutYV6P+aybBi4+oy5hx8HtuygvUENtVR7PNTtofOyn/dg3DL3sXuwWQ3qOXMEIsvwgAJM0OuabEDamiXXwqc+C 9bAB5ppD 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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 9/27/2024 11:58 AM, Jason Gunthorpe wrote: > On Fri, Sep 27, 2024 at 05:44:52PM +0200, David Hildenbrand wrote: >> /** >> * folio_try_add_pins() - add pins to an already-pinned folio >> * @folio: the folio to add more pins to >> * >> * Try to add more pins to an already-pinned folio. The semantics >> * of the pin (e.g., FOLL_WRITE) follow any existing pin and cannot >> * be changed. >> * >> * This function is helpful when having obtained a pin on a large folio >> * using memfd_pin_folios(), but wanting to logically unpin parts >> * (e.g., individual pages) of the folio later, for example, using >> * unpin_user_page_range_dirty_lock(). >> * >> * This is not the right interface to initially pin a folio. >> */ >> int folio_try_add_pins(struct folio *folio, unsigned int pins) >> { >> VM_WARN_ON_ONCE(!folio_maybe_dma_pinned(folio)); >> >> return try_grab_folio(folio, pins, FOLL_PIN); >> } > > That looks pretty good to me too Looks good and passes my tests, I will add this version in V3 of the patch series. Are you sure you want "try" in the name folio_try_add_pins? Usually try means that any failure is transient and a future call may succeed, but the failures in try_grab_folio look permanent to me (suggesting that is also a misnomer, but at least it is not exported). - Steve