linux-kernel - [RFC PATCH 09/13] mm/kstackwatch: Add architecture support validation

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Message-ID: <20250818122720.434981-10-wangjinchao600@gmail.com>
Date: Mon, 18 Aug 2025 20:26:14 +0800
From: Jinchao Wang <wangjinchao600@...il.com>
To: akpm@...ux-foundation.org
Cc: mhiramat@...nel.org,
	naveen@...nel.org,
	davem@...emloft.net,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Jinchao Wang <wangjinchao600@...il.com>
Subject: [RFC PATCH 09/13] mm/kstackwatch: Add architecture support validation

Add architecture compatibility checking during module initialization
to ensure kstackwatch operates only on supported platforms.

Currently supported architectures:
- x86_64: Full hardware breakpoint support with arch_reinstall_hw_breakpoint()

Signed-off-by: Jinchao Wang <wangjinchao600@...il.com>
---
 mm/kstackwatch/kernel.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/mm/kstackwatch/kernel.c b/mm/kstackwatch/kernel.c
index b6366808e891..9f01e0222210 100644
--- a/mm/kstackwatch/kernel.c
+++ b/mm/kstackwatch/kernel.c
@@ -189,8 +189,31 @@ static const struct proc_ops kstackwatch_proc_ops = {
 	.proc_release = single_release,
 };
 
+static int is_ksw_supported(void)
+{
+	static const char *const supported_archs[] = { "x86_64", NULL };
+
+	const char *current_arch = utsname()->machine;
+	int i;
+
+	for (i = 0; supported_archs[i] != NULL; i++) {
+		if (strcmp(current_arch, supported_archs[i]) == 0) {
+			pr_info("KSW: Architecture %s supports hardware breakpoints\n",
+				current_arch);
+			return 1;
+		}
+	}
+
+	pr_warn("KSW: Architecture %s may not support hardware breakpoints\n",
+		current_arch);
+	return 1;
+}
+
 static int __init kstackwatch_init(void)
 {
+	if (!is_ksw_supported())
+		return -EOPNOTSUPP;
+
 	ksw_config = kmalloc(sizeof(*ksw_config), GFP_KERNEL);
 	if (!ksw_config)
 		return -ENOMEM;
-- 
2.43.0