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mm: Add PG_arch_2 page flag
For arm64 MTE support it is necessary to be able to mark pages that contain user space visible tags that will need to be saved/restored e.g. when swapped out. To support this add a new arch specific flag (PG_arch_2). This flag is only available on 64-bit architectures due to the limited number of spare page flags on the 32-bit ones. Signed-off-by: Steven Price <steven.price@arm.com> [catalin.marinas@arm.com: use CONFIG_64BIT for guarding this new flag] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org>
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@ -217,6 +217,9 @@ u64 stable_page_flags(struct page *page)
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u |= kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2);
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u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1);
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u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1);
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#ifdef CONFIG_64BIT
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u |= kpf_copy_bit(k, KPF_ARCH_2, PG_arch_2);
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#endif
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return u;
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};
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@ -17,5 +17,6 @@
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#define KPF_ARCH 38
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#define KPF_UNCACHED 39
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#define KPF_SOFTDIRTY 40
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#define KPF_ARCH_2 41
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#endif /* LINUX_KERNEL_PAGE_FLAGS_H */
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@ -135,6 +135,9 @@ enum pageflags {
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#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
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PG_young,
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PG_idle,
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#endif
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#ifdef CONFIG_64BIT
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PG_arch_2,
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#endif
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__NR_PAGEFLAGS,
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@ -79,6 +79,12 @@
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#define IF_HAVE_PG_IDLE(flag,string)
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#endif
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#ifdef CONFIG_64BIT
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#define IF_HAVE_PG_ARCH_2(flag,string) ,{1UL << flag, string}
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#else
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#define IF_HAVE_PG_ARCH_2(flag,string)
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#endif
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#define __def_pageflag_names \
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{1UL << PG_locked, "locked" }, \
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{1UL << PG_waiters, "waiters" }, \
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@ -105,7 +111,8 @@ IF_HAVE_PG_MLOCK(PG_mlocked, "mlocked" ) \
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IF_HAVE_PG_UNCACHED(PG_uncached, "uncached" ) \
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IF_HAVE_PG_HWPOISON(PG_hwpoison, "hwpoison" ) \
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IF_HAVE_PG_IDLE(PG_young, "young" ) \
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IF_HAVE_PG_IDLE(PG_idle, "idle" )
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IF_HAVE_PG_IDLE(PG_idle, "idle" ) \
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IF_HAVE_PG_ARCH_2(PG_arch_2, "arch_2" )
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#define show_page_flags(flags) \
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(flags) ? __print_flags(flags, "|", \
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@ -78,6 +78,7 @@
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#define KPF_ARCH 38
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#define KPF_UNCACHED 39
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#define KPF_SOFTDIRTY 40
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#define KPF_ARCH_2 41
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/* [48-] take some arbitrary free slots for expanding overloaded flags
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* not part of kernel API
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@ -135,6 +136,7 @@ static const char * const page_flag_names[] = {
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[KPF_ARCH] = "h:arch",
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[KPF_UNCACHED] = "c:uncached",
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[KPF_SOFTDIRTY] = "f:softdirty",
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[KPF_ARCH_2] = "H:arch_2",
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[KPF_READAHEAD] = "I:readahead",
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[KPF_SLOB_FREE] = "P:slob_free",
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