Fabio M. De Francesco a9e9c93966 Documentation/mm: add details about kmap_local_page() and preemption ... What happens if a thread is preempted after mapping pages with kmap_local_page() was questioned recently.[1] Commit f3ba3c710a ("mm/highmem: Provide kmap_local*") from Thomas Gleixner explains clearly that on context switch, the maps of an outgoing task are removed and the map of the incoming task are restored and that kmap_local_page() can be invoked from both preemptible and atomic contexts.[2] Therefore, for the purpose to make it clearer that users can call kmap_local_page() from contexts that allow preemption, rework a couple of sentences and add further information in highmem.rst. [1] https://lore.kernel.org/lkml/5303077.Sb9uPGUboI@opensuse/ [2] https://lore.kernel.org/all/20201118204007.468533059@linutronix.de/ Link: https://lkml.kernel.org/r/20220728154844.10874-8-fmdefrancesco@gmail.com Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Suggested-by: Ira Weiny <ira.weiny@intel.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Peter Collingbourne <pcc@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2022-08-08 18:06:46 -07:00
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damon	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
active_mm.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
arch_pgtable_helpers.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
balance.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
bootmem.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
free_page_reporting.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
frontswap.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
highmem.rst	Documentation/mm: add details about kmap_local_page() and preemption	2022-08-08 18:06:46 -07:00
hmm.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
hugetlbfs_reserv.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
hwpoison.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
index.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
ksm.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
memory-model.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
mmu_notifier.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
numa.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
oom.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
overcommit-accounting.rst	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
page_allocation.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
page_cache.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
page_frags.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
page_migration.rst	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
page_owner.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
page_reclaim.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
page_table_check.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
page_tables.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
physical_memory.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
process_addrs.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
remap_file_pages.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
shmfs.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
slab.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
slub.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
split_page_table_lock.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
swap.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
transhuge.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
unevictable-lru.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
vmalloc.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
vmalloced-kernel-stacks.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
vmemmap_dedup.rst	mm: hugetlb_vmemmap: move code comments to vmemmap_dedup.rst	2022-08-08 18:06:43 -07:00
z3fold.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
zsmalloc.rst	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00