On 18.11.25 11:17, Lorenzo Stoakes wrote:
This patch adds the ability to atomically set VMA flags with only the mmap
read/VMA read lock held.
As this could be hugely problematic for VMA flags in general given that
all other accesses are non-atomic and serialised by the mmap/VMA locks, we
implement this with a strict allow-list - that is, only designated flags
are allowed to do this.
We make VM_MAYBE_GUARD one of these flags.
Signed-off-by: Lorenzo Stoakes <[email protected]>
Reviewed-by: Pedro Falcato <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
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IIUC all other flag modifications need a write lock, so this should just
work.
Acked-by: David Hildenbrand (Red Hat) <[email protected]>
--
Cheers
David
