From 18752045436318efa8e782cee5c7824b54ec1289 Mon Sep 17 00:00:00 2001 From: Meijing Zhao Date: Wed, 2 Sep 2026 14:45:10 +0800 Subject: [PATCH] mm: trace: name protection key encoding bits 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. Link: https://lore.kernel.org/1871da32001243b37147bac5af02d2f2ec64304e.1788330432.git.zhaomeijing@lixiang.com Signed-off-by: Meijing Zhao Signed-off-by: Andrew Morton Cc: Lorenzo Stoakes Cc: "Masami Hiramatsu (Google)" Cc: Mathieu Desnoyers Cc: Steven Rostedt --- 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") \