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mm: Do not enable PG_arch_2 for all 64-bit architectures
Commit 4beba94 ("mm: Add PG_arch_2 page flag") introduced a new page flag for all 64-bit architectures. However, even if an architecture is 64-bit, it may still have limited spare bits in the 'flags' member of 'struct page'. This may happen if an architecture enables SPARSEMEM without SPARSEMEM_VMEMMAP as is the case with the newly added loongarch. This architecture port needs 19 more bits for the sparsemem section information and, while it is currently fine with PG_arch_2, adding any more PG_arch_* flags will trigger build-time warnings. Add a new CONFIG_ARCH_USES_PG_ARCH_X option which can be selected by architectures that need more PG_arch_* flags beyond PG_arch_1. Select it on arm64. Signed-off-by: Catalin Marinas <[email protected]> [[email protected]: fix build with CONFIG_ARM64_MTE disabled] Signed-off-by: Peter Collingbourne <[email protected]> Reported-by: kernel test robot <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Steven Price <[email protected]> Reviewed-by: Steven Price <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
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