[PATCH v2 3/3] mm: trace: name protection key encoding bits

[Meijing Zhao]

From: Meijing Zhao <zhaomeijing@xxxxxxxxxxx>

Protection keys are encoded in architecture-specific HIGH_ARCH_* VMA
flag bits.  show_vma_flags(), which is used by VMA tracepoints and %pGv,
does not name those bits, leaving them as raw hexadecimal values.

Name the protection-key encoding bits pkey_bit0 through pkey_bit4 under
CONFIG_ARCH_HAS_PKEYS.  The names make clear that these are bits of one
protection-key value rather than independent protection keys.  For
example, protection key 3 is represented as:

  pkey_bit0|pkey_bit1

Honor CONFIG_ARCH_PKEY_BITS when exposing bit 3 and bit 4 so only bits
provided by the architecture are included.

Signed-off-by: Meijing Zhao <zhaomeijing@xxxxxxxxxxx>
---
 include/trace/events/mmflags.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 2f980d20a9f6..ef9aa388b84f 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -202,6 +202,24 @@ IF_HAVE_PG_ARCH_3(arch_3)
 # define IF_HAVE_VM_DROPPABLE(flag, name)
 #endif
 
+#ifdef CONFIG_ARCH_HAS_PKEYS
+# define IF_HAVE_VM_PKEY(flag, name) {flag, name},
+#if CONFIG_ARCH_PKEY_BITS > 3
+# define IF_HAVE_VM_PKEY3(flag, name) {flag, name},
+#else
+# define IF_HAVE_VM_PKEY3(flag, name)
+#endif
+#if CONFIG_ARCH_PKEY_BITS > 4
+# define IF_HAVE_VM_PKEY4(flag, name) {flag, name},
+#else
+# define IF_HAVE_VM_PKEY4(flag, name)
+#endif
+#else
+# define IF_HAVE_VM_PKEY(flag, name)
+# define IF_HAVE_VM_PKEY3(flag, name)
+# define IF_HAVE_VM_PKEY4(flag, name)
+#endif
+
 #ifdef CONFIG_ARM64_MTE
 # define IF_HAVE_VM_MTE(flag, name) {flag, name},
 #else
@@ -250,6 +268,11 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY,	"softdirty"	)		\
 	{VM_HUGEPAGE,			"hugepage"	},		\
 	{VM_NOHUGEPAGE,			"nohugepage"	},		\
 IF_HAVE_VM_DROPPABLE(VM_DROPPABLE,	"droppable"	)		\
+IF_HAVE_VM_PKEY(VM_PKEY_BIT0,		"pkey_bit0")		\
+IF_HAVE_VM_PKEY(VM_PKEY_BIT1,		"pkey_bit1")		\
+IF_HAVE_VM_PKEY(VM_PKEY_BIT2,		"pkey_bit2")		\
+IF_HAVE_VM_PKEY3(VM_PKEY_BIT3,		"pkey_bit3")		\
+IF_HAVE_VM_PKEY4(VM_PKEY_BIT4,		"pkey_bit4")		\
 IF_HAVE_VM_MTE(VM_MTE,			"mte")			\
 IF_HAVE_VM_MTE(VM_MTE_ALLOWED,		"mte_allowed")		\
 IF_HAVE_VM_SHADOW_STACK(VM_SHADOW_STACK, "shadow_stack")	\
-- 
2.25.1