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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: Alistair Popple wrote: > GUP uses pXX_devmap() calls to see if it needs to a get a reference on > the associated pgmap data structure to ensure the pages won't go > away. However it's a driver responsibility to ensure that if pages are > mapped (ie. discoverable by GUP) that they are not offlined or removed > from the memmap so there is no need to hold a reference on the pgmap > data structure to ensure this. > > Furthermore mappings with PFN_DEV are no longer created, hence this > effectively dead code anyway so can be removed. > > Signed-off-by: Alistair Popple > --- > include/linux/huge_mm.h | 3 +- > mm/gup.c | 162 +---------------------------------------- > mm/huge_memory.c | 40 +---------- > 3 files changed, 5 insertions(+), 200 deletions(-) Hooray! Goodbye dev_pagemap mess in gup.c. Reviewed-by: Dan Williams