From: Meijing Zhao <zhaomeijing100@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Meijing Zhao <zhaomeijing@lixiang.com>
Subject: [PATCH RESEND 2/3] mm: trace: decode MTE and shadow stack VMA flags
Date: Thu, 23 Jul 2026 17:29:04 +0800 [thread overview]
Message-ID: <20260723092905.761037-3-zhaomeijing100@gmail.com> (raw)
In-Reply-To: <20260723092905.761037-1-zhaomeijing100@gmail.com>
From: Meijing Zhao <zhaomeijing@lixiang.com>
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
Signed-off-by: Meijing Zhao <zhaomeijing@lixiang.com>
---
include/trace/events/mmflags.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index add5ad6843e8..2d76daacb70c 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -204,6 +204,19 @@ 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" }, \
@@ -238,6 +251,9 @@ 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) \
--
2.25.1
next prev parent reply other threads:[~2026-07-23 9:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 9:29 [PATCH RESEND 0/3] mm: trace: decode architecture-specific VMA flags Meijing Zhao
2026-07-23 9:29 ` [PATCH RESEND 1/3] mm: trace: decode arm64 and sparc64 VM_ARCH_1 flags Meijing Zhao
2026-07-23 9:29 ` Meijing Zhao [this message]
2026-07-23 9:29 ` [PATCH RESEND 3/3] mm: trace: name protection key encoding bits Meijing Zhao
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260723092905.761037-3-zhaomeijing100@gmail.com \
--to=zhaomeijing100@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mhiramat@kernel.org \
--cc=rostedt@goodmis.org \
--cc=zhaomeijing@lixiang.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox