process_mrelease: backport 5.15 syscall to 4.19 - #1
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Summary
Backport Linux 5.15
process_mrelease()syscall (nr 448) to the SM8250 4.19 CAF base used by Pulsar.Implementation
pidfd_get_pid(),find_lock_task_mm(),task_will_free_mem()and__oom_reap_task_mm()primitives.mmap_read_lock_killable()semantics to 4.19down_read_killable(&mm->mmap_sem).MMF_OOM_SKIPwhile holdingmmap_semto serialize withexit_mmap().futex_waitvat 449.Validation
The development branch was validated by GitHub Actions run
31716685994, which completed patch application, configuration, ARM64 kernel build, artifact collection and AnyKernel packaging successfully.The PR branch is being kept minimal: only the
process_mreleasebackport patch should differ frommain. Temporary workflow/debugging changes are excluded.