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: Peter Collingbourne <pcc@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Steven Price <steven.price@xxxxxxx>
[catalin.marinas@xxxxxxx: added flag preserving in __split_huge_page_tail()]
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
v3:
- fix page flag dumping
fs/proc/page.c | 1 +
include/linux/kernel-page-flags.h | 1 +
include/linux/page-flags.h | 1 +
include/trace/events/mmflags.h | 7 ++++---
mm/huge_memory.c | 1 +
tools/vm/page-types.c | 2 ++
6 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/fs/proc/page.c b/fs/proc/page.c
index a2873a617ae8..0129aa3cfb7a 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -220,6 +220,7 @@ u64 stable_page_flags(struct page *page)
u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1);
#ifdef CONFIG_64BIT
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;
diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h
index eee1877a354e..859f4b0c1b2b 100644
--- a/include/linux/kernel-page-flags.h
+++ b/include/linux/kernel-page-flags.h
@@ -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 */
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 465ff35a8c00..ad01a3abf6c8 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -134,6 +134,7 @@ enum pageflags {
#endif
#ifdef CONFIG_64BIT
PG_arch_2,
+ PG_arch_3,
#endif
#ifdef CONFIG_KASAN_HW_TAGS
PG_skip_kasan_poison,
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 11524cda4a95..704380179986 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -91,9 +91,9 @@
#endif
#ifdef CONFIG_64BIT
-#define IF_HAVE_PG_ARCH_2(flag,string) ,{1UL << flag, string}
+#define IF_HAVE_PG_ARCH_2_3(flag,string) ,{1UL << flag, string}
#else
-#define IF_HAVE_PG_ARCH_2(flag,string)
+#define IF_HAVE_PG_ARCH_2_3(flag,string)
#endif
#ifdef CONFIG_KASAN_HW_TAGS
@@ -129,7 +129,8 @@ IF_HAVE_PG_UNCACHED(PG_uncached, "uncached" ) \
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_2(PG_arch_2, "arch_2" ) \
+IF_HAVE_PG_ARCH_2_3(PG_arch_2, "arch_2" ) \
+IF_HAVE_PG_ARCH_2_3(PG_arch_3, "arch_3" ) \
IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison")
#define show_page_flags(flags) \
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0611b2fd145a..262e9ca627fb 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2399,6 +2399,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
(1L << PG_unevictable) |
#ifdef CONFIG_64BIT
(1L << PG_arch_2) |
+ (1L << PG_arch_3) |
#endif
(1L << PG_dirty)));
diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index 381dcc00cb62..364373f5bba0 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -79,6 +79,7 @@
#define KPF_UNCACHED 39
#define KPF_SOFTDIRTY 40
#define KPF_ARCH_2 41
+#define KPF_ARCH_3 42
/* [47-] take some arbitrary free slots for expanding overloaded flags
* not part of kernel API
@@ -138,6 +139,7 @@ static const char * const page_flag_names[] = {
[KPF_UNCACHED] = "c:uncached",
[KPF_SOFTDIRTY] = "f:softdirty",
[KPF_ARCH_2] = "H:arch_2",
+ [KPF_ARCH_3] = "H:arch_3",
[KPF_ANON_EXCLUSIVE] = "d:anon_exclusive",
[KPF_READAHEAD] = "I:readahead",
--
2.37.1.559.g78731f0fdb-goog
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