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mm: Do not enable PG_arch_2 for all 64-bit architectures

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Commit 4beba9486a ("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 <catalin.marinas@arm.com>
[pcc@google.com: fix build with CONFIG_ARM64_MTE disabled]
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Steven Price <steven.price@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221104011041.290951-2-pcc@google.com
This commit is contained in:
Catalin Marinas
2022-11-03 18:10:34 -07:00
committed by Marc Zyngier
parent 30a0b95b13
commit b0284cd29a
6 changed files with 16 additions and 7 deletions
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2
include/linux/page-flags.h
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@@ -132,7 +132,7 @@ enum pageflags {
PG_young,
PG_idle,
#endif
#ifdef CONFIG_64BIT
#ifdef CONFIG_ARCH_USES_PG_ARCH_X
PG_arch_2,
#endif
#ifdef CONFIG_KASAN_HW_TAGS