RFC powerpc/mm: Enable clang context analysis

Lock acquire and release checking used to be done with Sparse. That support was removed [1] and replaced with Clang context analysis [2].

Note that enabling this caught a real locking rcu bug in arch/powerpc/mm (Patch-1). Note, more invasive checkers to check what each lock protects is deferred for later enablement.

This is based on top of previous powerpc/powernv,pseries Clang context analysis enablement series [3].

The series was build tested with LLVM/Clang 23.x

[1] 5b63d0ae94cc ("compiler-context-analysis: Remove Sparse support")
[2] 3269701cb256 ("compiler-context-analysis: Add infrastructure for Context Analysis with Clang") [3]: https://lore.kernel.org/linuxppc-dev/[email protected]/

Ritesh Harjani (IBM) (6):
powerpc/mm/book3s64: unlock RCU before returning from mm_iommu_is_devmem() powerpc/mm/book3s64: Rework tlbie() to remove conditional locking powerpc/mm/book3s64: Rework native_flush_hash_range() to remove conditional locking powerpc/mm/book3s64: Annotate the subpage-protection PTE lock powerpc/mm: Rework nohash TLB broadcast locking
powerpc/mm: Enable context analysis

 arch/powerpc/mm/Makefile                |   2 +
 arch/powerpc/mm/book3s32/Makefile       |   2 +
 arch/powerpc/mm/book3s64/Makefile       |   2 +
 arch/powerpc/mm/book3s64/hash_native.c  | 122 +++++++++++++++---------
 arch/powerpc/mm/book3s64/iommu_api.c    |   6 +-
 arch/powerpc/mm/book3s64/subpage_prot.c |   2 +
 arch/powerpc/mm/nohash/Makefile         |   2 +
 arch/powerpc/mm/nohash/mmu_context.c    |   1 +
 arch/powerpc/mm/nohash/tlb.c            |   8 +-
 9 files changed, 98 insertions(+), 49 deletions(-)

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2.39.5