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mm: trace: decode MTE and shadow stack VMA flags

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show_vma_flags(), which is used by VMA tracepoints and %pGv, leaves
architecture-specific HIGH_ARCH_* bits unnamed.  Arm64 MTE flags and user
shadow stack flags are therefore printed as raw hexadecimal values.

These bit positions are shared between architectures.  For example, bit 37
represents VM_MTE_ALLOWED on arm64 but VM_SHADOW_STACK on x86, so a shared
HIGH_ARCH_* bit cannot be given an unconditional name.

Add conditionally compiled names for VM_MTE, VM_MTE_ALLOWED and
VM_SHADOW_STACK.  Keep the configuration guards aligned with the
definitions of these aliases so each shared bit position is decoded
according to the target architecture.

For example, an arm64 VMA containing VM_MTE_ALLOWED is now printed as:

  ...|account|mte_allowed|...

instead of:

  ...|account|0x2000000000

Link: https://lore.kernel.org/1c7f7003cff8d00209baa8498f1efee113f5b5a4.1788330432.git.zhaomeijing@lixiang.com
Signed-off-by: Meijing Zhao <zhaomeijing@lixiang.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Meijing Zhao 2026-09-02 14:45:09 +08:00 committed by Andrew Morton
parent 4c770a1ca2
commit a971ac3a0a
1 changed files with 16 additions and 0 deletions
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16
include/trace/events/mmflags.h
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@ -202,6 +202,19 @@ IF_HAVE_PG_ARCH_3(arch_3)
# define IF_HAVE_VM_DROPPABLE(flag, name)
#endif
#ifdef CONFIG_ARM64_MTE
# define IF_HAVE_VM_MTE(flag, name) {flag, name},
#else
# define IF_HAVE_VM_MTE(flag, name)
#endif
#if defined(CONFIG_X86_USER_SHADOW_STACK) || defined(CONFIG_RISCV_USER_CFI) || \
defined(CONFIG_ARM64_GCS)
# define IF_HAVE_VM_SHADOW_STACK(flag, name) {flag, name},
#else
# define IF_HAVE_VM_SHADOW_STACK(flag, name)
#endif
#define __def_vmaflag_names \
{VM_READ, "read" }, \
{VM_WRITE, "write" }, \
@ -237,6 +250,9 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \
{VM_HUGEPAGE, "hugepage" }, \
{VM_NOHUGEPAGE, "nohugepage" }, \
IF_HAVE_VM_DROPPABLE(VM_DROPPABLE, "droppable" ) \
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") \
{VM_MERGEABLE, "mergeable" } \
#define show_vma_flags(flags) \