Commit ef6458b1 authored by Peter Collingbourne's avatar Peter Collingbourne Committed by Marc Zyngier

mm: Add PG_arch_3 page flag

As with PG_arch_2, this flag is only allowed on 64-bit architectures due
to the shortage of bits available. It will be used by the arm64 MTE code
in subsequent patches.
Signed-off-by: default avatarPeter Collingbourne <pcc@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Steven Price <steven.price@arm.com>
[catalin.marinas@arm.com: added flag preserving in __split_huge_page_tail()]
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarSteven Price <steven.price@arm.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221104011041.290951-5-pcc@google.com
parent 2dbf12ae
......@@ -221,6 +221,7 @@ u64 stable_page_flags(struct page *page)
u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1);
#ifdef CONFIG_ARCH_USES_PG_ARCH_X
u |= kpf_copy_bit(k, KPF_ARCH_2, PG_arch_2);
u |= kpf_copy_bit(k, KPF_ARCH_3, PG_arch_3);
#endif
return u;
......
......@@ -18,5 +18,6 @@
#define KPF_UNCACHED 39
#define KPF_SOFTDIRTY 40
#define KPF_ARCH_2 41
#define KPF_ARCH_3 42
#endif /* LINUX_KERNEL_PAGE_FLAGS_H */
......@@ -134,6 +134,7 @@ enum pageflags {
#endif
#ifdef CONFIG_ARCH_USES_PG_ARCH_X
PG_arch_2,
PG_arch_3,
#endif
#ifdef CONFIG_KASAN_HW_TAGS
PG_skip_kasan_poison,
......
......@@ -131,6 +131,7 @@ IF_HAVE_PG_HWPOISON(PG_hwpoison, "hwpoison" ) \
IF_HAVE_PG_IDLE(PG_young, "young" ) \
IF_HAVE_PG_IDLE(PG_idle, "idle" ) \
IF_HAVE_PG_ARCH_X(PG_arch_2, "arch_2" ) \
IF_HAVE_PG_ARCH_X(PG_arch_3, "arch_3" ) \
IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
#define show_page_flags(flags) \
......
......@@ -2446,6 +2446,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
(1L << PG_unevictable) |
#ifdef CONFIG_ARCH_USES_PG_ARCH_X
(1L << PG_arch_2) |
(1L << PG_arch_3) |
#endif
(1L << PG_dirty) |
LRU_GEN_MASK | LRU_REFS_MASK));
......
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