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Users of kmap_local_page() must be absolutely sure to not hand kernel virtual address obtained calling kmap_local_page() on highmem pages to other contexts because those pointers are thread local, therefore, they are no longer valid across different contexts. Extend the documentation of kmap_local_page() to warn users about the above-mentioned potential invalid use of pointers returned by kmap_local_page(). Link: https://lkml.kernel.org/r/20220728154844.10874-5-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> |
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.. | ||
damon | ||
active_mm.rst | ||
arch_pgtable_helpers.rst | ||
balance.rst | ||
bootmem.rst | ||
free_page_reporting.rst | ||
frontswap.rst | ||
highmem.rst | ||
hmm.rst | ||
hugetlbfs_reserv.rst | ||
hwpoison.rst | ||
index.rst | ||
ksm.rst | ||
memory-model.rst | ||
mmu_notifier.rst | ||
numa.rst | ||
oom.rst | ||
overcommit-accounting.rst | ||
page_allocation.rst | ||
page_cache.rst | ||
page_frags.rst | ||
page_migration.rst | ||
page_owner.rst | ||
page_reclaim.rst | ||
page_table_check.rst | ||
page_tables.rst | ||
physical_memory.rst | ||
process_addrs.rst | ||
remap_file_pages.rst | ||
shmfs.rst | ||
slab.rst | ||
slub.rst | ||
split_page_table_lock.rst | ||
swap.rst | ||
transhuge.rst | ||
unevictable-lru.rst | ||
vmalloc.rst | ||
vmalloced-kernel-stacks.rst | ||
vmemmap_dedup.rst | ||
z3fold.rst | ||
zsmalloc.rst |