tree 098b54af7cc4f4cc110e7e20ad97de147b3b005c
parent a4d26b9a4b5787ff825bf98967e4931fee100129
author Suren Baghdasaryan <surenb@google.com> 1637769364 -0800
committer Suren Baghdasaryan <surenb@google.com> 1639604728 +0000

ANDROID: fix ABI breakage caused by mm_struct->mmu_notifier_lock addition

To prevent ABI breakage, move mm->mmu_notifier_lock into
mm->notifier_subscriptions and allocate mm->notifier_subscriptions
during mm creation in mmu_notifier_subscriptions_init. This results
in additional 176 bytes allocated for each mm, but prevents ABI breakage.
mmu_notifier_subscriptions_hdr structure is introduced at the beginning
of mmu_notifier_subscriptions to keep mmu_notifier_subscriptions hidden
and prevent its type CRC from changing when used in other structures.

Bug: 161210518
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I6f435708d642b70b22e0243c8b33108c208ce5bb