search for: page_use_kmap

...to actually have much better debug coverage, this is where it should be (I like the "every other address" thing too, don't get me wrong). In particular, instead of these PageHighMem(page) tests, I think something like this would be better: #ifdef CONFIG_DEBUG_HIGHMEM #define page_use_kmap(page) ((page),1) #else #define page_use_kmap(page) PageHighMem(page) #endif adn then replace those "if (!PageHighMem(page))" tests with "if (!page_use_kmap())" instead. IOW, in debug mode, it would _always_ remap the page, whether it's highmem or not. That would...

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all