From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f182.google.com (mail-pf1-f182.google.com [209.85.210.182]) (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 ED0842ECD1E for ; Fri, 12 Sep 2025 10:13:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757671990; cv=none; b=Xqp8qvNKkUrdt0nUqcOj/b6o3YJo8TvdyCjC6odOJ8NctczTN5Z/o0DeXul5Ct1I9wRSIoAx9nUw7Q6cxWg7RopBl1z+a8L8IBMRTFkj0lawxAyq78Azj1T7U47+cXgxWzptTWq7wD46eeyufcjIOOYfOjcLNq7CKsTWTMw8xXI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757671990; c=relaxed/simple; bh=ljHubFdo4RbY9sPZZpmIGXXQZrdiNxFcVGyARbY49GM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pJ8Vg3ZTvg5LMVeY1gw1Qf2VjucZ/ccQSb05CW0ydVNXPtLz8CCirw/HSfL0GnXeDMNakYBkIui3uZ/J8hJd5cBJZQab5Prl5yczRIsRpR/lmFhIFQ4tM8mE5mvivj93j6ngPNdiImC+vgZI0r+O+sZ8AxzOJTcnSzzN5zO7mOo= 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=IDPSCdZU; arc=none smtp.client-ip=209.85.210.182 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="IDPSCdZU" Received: by mail-pf1-f182.google.com with SMTP id d2e1a72fcca58-7722bcb989aso1243354b3a.1 for ; Fri, 12 Sep 2025 03:13:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757671987; x=1758276787; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=clh29CJb8P7VxnXXw4h/9gdA7sU+C9WtN5xBt8cm/X4=; b=IDPSCdZUUpOtAF1g097xo+JllyTdTsE6JXJrlMnaWPvAcFm+Byxx8HkfwMK2Ay7qhg yBS9gbB0W31nUnKN6faZ91ABd77++7zOZLhbMRZgm/rlORu4DnKMRkZh7El4jkaNwRlU tZdQpoQLvNTx9UGq7GCegQB0tUBgb8ggjiQIroUh2uVAxkqX7WVIqy961kqGuGasz/Vf I0I+Ps2IciMECyInMUAH1SXckZetPLXGkUtE0mSUlcPL7+lLZegw7xcYudczi23IUdMd 98fgrBf9hBhJ7tTapx+kiRhcgejl4+jOdRZze0dk69A6uydoEI/9rj5W6Gjqsr31VR0K WKlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757671987; x=1758276787; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=clh29CJb8P7VxnXXw4h/9gdA7sU+C9WtN5xBt8cm/X4=; b=Szjj7F8yBxE/Nt4uKHeTShSehH9U374PXmFjVI9WEVuYgB1cS95iYB0xwVNrSd86Fj zkNusKOf066MsnHFx5D10x/5ysA9C8YpUFFy5TIwFQb+8dC5smC/L/oe5wOI1GDHRLrH zre57iw3MiRE5y+7D2G2eMfRPY4qqTOccFfVT73mS3Fgvoy9z1tx3hq/GSqp534P2JDH 89cTnfTcwolFqd6N6U6G2PU4pEsPc5bF3b9eXJ/8shd4/FJV1SNhMuWWD9ZY3v9tj2ie nNN5E9GXVftq1SdvWaNCMcsEZFLPGop8kF+zxNhj3Uc11icXfD1B9HkFLlUBFBDGZORc ihdw== X-Forwarded-Encrypted: i=1; AJvYcCUqa5GUdhuWSIsOSo7IMuOVj5zRzJH9cFQj2jfUcEbGcHi/FP1JhJgGlywxPi9bJKPbG1iEIzhI2kw=@vger.kernel.org X-Gm-Message-State: AOJu0YzyR+SUwDzXTohTKOgY5ItpAZkt8xI7DATOOaNhAoWilTGhgk02 zjb9CdGh84X/2mmFH7zs0IPpbp71unqqoIjA7btD/N/ufTyp/UYbNCuN X-Gm-Gg: ASbGncvzPT9mZD+hxOg3ZfYBzXQnetznnjDKTg0Yy62L13/6TKC6lbhGGkpgtZdXQWM IJ3s1UGcFHXmEgEuwD0R7VSAiSAnsQ7BhaDRSbjvbGDFz9wJfkMgfnlPMFk/eZ4bwk7alzTVXa0 +Nc4pB51jsBAgK1VrVlZ/di2yGs2YgKk+lBdldF8UUyzbSOTupqNoqOxibhEp0wrO/YnCV6fx0v OaJ291Ax2FoyLykJ6kP+tnzk3vp55tU8pYqAqaf930IK5rnBqFX8Gcn0ZQjjcs1oiNG1oL45jWN 2NZEqy58znRPT+cB+AGWgN6JxNod1aGwzanv+QtE4Rkto1A2ohVia+YtHt6pueNgmDhqTpCK/5T dosle53Go9AyWvJ/kwtWd/XFzVJVxY6HVzhI= X-Google-Smtp-Source: AGHT+IHaEUea7hRsSpqZl85bTv6q0KsvHQdzV/MeRfkpCvkL2MgkVHPyR0dQHBXbAqMEfqsEXUoPVA== X-Received: by 2002:a05:6a00:982:b0:76b:d869:43fd with SMTP id d2e1a72fcca58-7761216815amr3249434b3a.18.1757671987091; Fri, 12 Sep 2025 03:13:07 -0700 (PDT) Received: from localhost ([185.49.34.62]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7760793b6b1sm4934804b3a.20.2025.09.12.03.13.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Sep 2025 03:13:06 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Kees Cook , Alice Ryhl , Sami Tolvanen , Miguel Ojeda , Masahiro Yamada , Rong Xu , Naveen N Rao , David Kaplan , Andrii Nakryiko , Jinjie Ruan , Nam Cao , workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Andrey Ryabinin , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v4 14/21] mm/ksw: add self-debug helpers Date: Fri, 12 Sep 2025 18:11:24 +0800 Message-ID: <20250912101145.465708-15-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250912101145.465708-1-wangjinchao600@gmail.com> References: <20250912101145.465708-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: workflows@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Provide two debug helpers: - ksw_watch_show(): print the current watch target address and length. - ksw_watch_fire(): intentionally trigger the watchpoint immediately by writing to the watched address, useful for testing HWBP behavior. Signed-off-by: Jinchao Wang --- mm/kstackwatch/kstackwatch.h | 2 ++ mm/kstackwatch/watch.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 5ea2db76cdfb..9a4900df8ff8 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -47,5 +47,7 @@ int ksw_watch_init(void); void ksw_watch_exit(void); int ksw_watch_on(ulong watch_addr, u16 watch_len); int ksw_watch_off(ulong watch_addr, u16 watch_len); +void ksw_watch_show(void); +void ksw_watch_fire(void); #endif /* _KSTACKWATCH_H */ diff --git a/mm/kstackwatch/watch.c b/mm/kstackwatch/watch.c index 795e779792da..2e9294595bf3 100644 --- a/mm/kstackwatch/watch.c +++ b/mm/kstackwatch/watch.c @@ -161,3 +161,21 @@ void ksw_watch_exit(void) unregister_wide_hw_breakpoint(watch_events); watch_events = NULL; } + +/* self debug function */ +void ksw_watch_show(void) +{ + pr_info("watch target bp_addr: 0x%llx len:%llu\n", watch_attr.bp_addr, + watch_attr.bp_len); +} +EXPORT_SYMBOL_GPL(ksw_watch_show); + +/* self debug function */ +void ksw_watch_fire(void) +{ + char *ptr = (char *)watch_attr.bp_addr; + + pr_warn("watch triggered immediately\n"); + *ptr = 0x42; // This should trigger immediately for any bp_len +} +EXPORT_SYMBOL_GPL(ksw_watch_fire); -- 2.43.0