From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 011FD326D65 for ; Mon, 10 Nov 2025 16:38:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762792707; cv=none; b=n9Q51xlRNH1dBz07w+p9x7CovkcPJYvVGs9spy811/t7XT0lStk65Q87xBNdXTB6VHVMpOcHR5m3eGRFyzjJwvSvNwV8rM7WLl0907DHZd8V778hw1AC+P1vij85/Op0lL/rLlObkTMaF8Jh/ej3iLEUx/xLdDdSfILPZrXWij0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762792707; c=relaxed/simple; bh=ARZpIKOlBzKXjre3Q9k7I/0rPX2+0FVqcnLvQ0SL+xQ=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=szGioHh417LaD0TWFT8qgEFvZ1+KSfUWT0nXZtLyU5TSALi0FGXyzT6RM2xstq5iaEuh+U5qT8feU1easXzUMkYDO6rCFkpUmXpz/BTn6fEqoAKbT9mEDigKJecolLcaC8Sg+QTgPoe8AVwF/aUo8bHqsAlMj1OK1SbjESPWxJk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=WMhFpo0+; arc=none smtp.client-ip=209.85.210.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WMhFpo0+" Received: by mail-pf1-f170.google.com with SMTP id d2e1a72fcca58-7aa9be9f03aso2825699b3a.2 for ; Mon, 10 Nov 2025 08:38:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762792705; x=1763397505; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=OV6BMzpvIqPwW8tqyoqDeqegoFqswySAQs38qdvsWjQ=; b=WMhFpo0+fc8I2XzRVcLvXDPxY/9K/seUdY+dwPTE0soi/EN2G99WavgUEwqrtWzsQh H16pZs+dvOpD57zlEbs6T9nDQT51Yh0it26FDyGgkRHXtBPqtu6m5WarXEM8E3FyA/f1 ehejOCnc+YIWV+k1QUgPfNASuMDAeL5IGzc717BoKU910zVkXgacjmhI88IcnoPGotjE IY1OWi3zKqgZw+wRXSHc1ord3WryIVf/7PtG0Hj8Ma2oHzZlcQmKKYMcekmMxROd2hK9 lVnkHdNghicMP9pKYSQ/R9d04FQlvEbqV28hsNO2NYuNiziX0ONaSc6BqTkH822yqtXY 0YfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762792705; x=1763397505; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=OV6BMzpvIqPwW8tqyoqDeqegoFqswySAQs38qdvsWjQ=; b=n/jehCNs01MEl+34gn60BDl7VCpglCUb9X3Vj0bXQqBjzAlnrfogmyhjmJYvY9yvyV 0Q7SsBuCLAY7/lmKG6n0P+xXl8xKQXVEV03b8Gw6QobwaiZ5eAM6BKdI/ccY+9lknkoY 6ZYpxdyAOnM2IJ6GeZNgL+xtGeXMMet8KkbHiL5p2Xsl93DsVce+T7uVrFjjDeFLjE8S ItvR1O18XVwqvweBql82LkJkgv/Y+BOEHlZ8H7ZBv5jpjmtrvF2lweSYnFuZUh3/mOyL pUuj1xBff36axZh55x884oprOikSsyAMajIHBDn1e2+2I8XkP9PlWNoAkvxKXJ9iOuxE 8Viw== X-Forwarded-Encrypted: i=1; AJvYcCVVcgrHnTFF74V42QSyKHO7nvCJujxLSSDTfCp4xQcHwRFSfO6bILrDvR+2Rgl+9VYAnBcH0nkuWDcHo1aKkAYa@vger.kernel.org X-Gm-Message-State: AOJu0YzKG4yb4HMorxROeYemEO8juwI0FH9aEmiEs4K0Cc+opgi+RJJ6 jtWJO9MvmosiO53lyq0EIj4DKte8XhIGzl2ORpkaXb6Z604bE8N0Eh1g X-Gm-Gg: ASbGnct3wp4ArSY97HhbLik2A9OobTlP6FIMlNwWQ4c13fZtsnSSrWMsjrwp4bLzBce DwaD8B7C+CapHtCQIgQamCZsA60jV8g0bhzUFnEOiURWhJFXOKgxvXbOQ4DkOWwTCQ4GCJswGSE m4aYiD+L/rtXigO90zOISgkfeJV0KTfBvs/BYB/YUJ+symppLdVDXFD1GthBf0lPEdnXcs8l+0r uhXJZBvplH5LKgGow6G776t9s1rUtvZ0ttfoIhChwKG9RuSx3b2u7rgLxFIbEYf8IPzz2fkjruV m7/RFGnExtPx2ZOrbIC1JHgftAjF0PgTAWZTxvEH/y/mhki5JaHQW3+bTAlzXaYSk0umZ8dilPA 0pdqS1/FUC0VxRCZn2Nlgyw7Lk6I+OKk3g9cyYYTFD/mFRP0sercLeF6xuQl/q90A+LeYYARt9O hxgvJ9RVU6zy69PBq9Udp7yg== X-Google-Smtp-Source: AGHT+IFPqCK5s7mZ0bMPwZdYahUYIC+qd++YwSpdh6nmmJ2pTVRZoEYmMMiGsvaFI6blh1/WMmJ4hA== X-Received: by 2002:a05:6a00:883:b0:772:4319:e7ed with SMTP id d2e1a72fcca58-7b2277caeecmr11401444b3a.29.1762792705147; Mon, 10 Nov 2025 08:38:25 -0800 (PST) Received: from localhost ([103.88.46.62]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7b0ccb5a31esm12324547b3a.63.2025.11.10.08.38.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 08:38:24 -0800 (PST) From: Jinchao Wang To: Andrew Morton , "Masami Hiramatsu (Google)" , Peter Zijlstra , Randy Dunlap , Marco Elver , Mike Rapoport , Alexander Potapenko , Adrian Hunter , Alexander Shishkin , Alice Ryhl , Andrey Konovalov , Andrey Ryabinin , Andrii Nakryiko , Ard Biesheuvel , Arnaldo Carvalho de Melo , Ben Segall , Bill Wendling , Borislav Petkov , Catalin Marinas , Dave Hansen , David Hildenbrand , David Kaplan , "David S. Miller" , Dietmar Eggemann , Dmitry Vyukov , "H. Peter Anvin" , Ian Rogers , Ingo Molnar , James Clark , Jinchao Wang , Jinjie Ruan , Jiri Olsa , Jonathan Corbet , Juri Lelli , Justin Stitt , kasan-dev@googlegroups.com, Kees Cook , "Liam R. Howlett" , "Liang Kan" , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev, Lorenzo Stoakes , Mark Rutland , Masahiro Yamada , Mathieu Desnoyers , Mel Gorman , Michal Hocko , Miguel Ojeda , Nam Cao , Namhyung Kim , Nathan Chancellor , Naveen N Rao , Nick Desaulniers , Rong Xu , Sami Tolvanen , Steven Rostedt , Suren Baghdasaryan , Thomas Gleixner , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Valentin Schneider , Vincent Guittot , Vincenzo Frascino , Vlastimil Babka , Will Deacon , workflows@vger.kernel.org, x86@kernel.org Subject: [PATCH v8 23/27] mm/ksw: add recursive depth test Date: Tue, 11 Nov 2025 00:36:18 +0800 Message-ID: <20251110163634.3686676-24-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251110163634.3686676-1-wangjinchao600@gmail.com> References: <20251110163634.3686676-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce a test that performs stack writes in recursive calls to exercise stack watch at a specific recursion depth. Signed-off-by: Jinchao Wang --- mm/kstackwatch/test.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/mm/kstackwatch/test.c b/mm/kstackwatch/test.c index b3f363d9e1e8..1d196f72faba 100644 --- a/mm/kstackwatch/test.c +++ b/mm/kstackwatch/test.c @@ -17,6 +17,7 @@ static struct dentry *test_file; #define BUFFER_SIZE 32 +#define MAX_DEPTH 6 static void test_watch_fire(void) { @@ -48,6 +49,21 @@ static void test_canary_overflow(void) pr_info("exit of %s\n", __func__); } +static void test_recursive_depth(int depth) +{ + u64 buffer[BUFFER_SIZE]; + + pr_info("entry of %s depth:%d\n", __func__, depth); + + if (depth < MAX_DEPTH) + test_recursive_depth(depth + 1); + + buffer[0] = depth; + barrier_data(buffer); + + pr_info("exit of %s depth:%d\n", __func__, depth); +} + static ssize_t test_dbgfs_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos) { @@ -73,6 +89,9 @@ static ssize_t test_dbgfs_write(struct file *file, const char __user *buffer, case 1: test_canary_overflow(); break; + case 2: + test_recursive_depth(0); + break; default: pr_err("Unknown test number %d\n", test_num); return -EINVAL; @@ -94,7 +113,8 @@ static ssize_t test_dbgfs_read(struct file *file, char __user *buffer, "Usage:\n" "echo test{i} > /sys/kernel/debug/kstackwatch/test\n" " test0 - test watch fire\n" - " test1 - test canary overflow\n"; + " test1 - test canary overflow\n" + " test2 - test recursive func\n"; return simple_read_from_buffer(buffer, count, ppos, usage, strlen(usage)); -- 2.43.0