From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f180.google.com (mail-pg1-f180.google.com [209.85.215.180]) (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 8E6292FFF9D for ; Wed, 24 Sep 2025 12:00:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758715221; cv=none; b=h+sXF/AXNAEFB6PR3K7ASaC8dLvIX6xhISlWArCNlumaAXdbM1Q62Xjq1wQz4FRZI9d+mfAlr9lOmGz62b5ieWn5vF06hje/bOVsAWSwV1Kr7x5nJvT6zfHSBBW6KtUnarZkXzgVCmGpZ47mTE1q3jfp0XMbG7iyP+K73xMmUto= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758715221; c=relaxed/simple; bh=zgbvGJBSx4YBKNkqO/qzz/La9XfnZ3vAatfFaQMoL7I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VFSgs5myxYovAvoFij7KUOkcBrLWFVZborx9Sf3M/VjJrJDz0CBZZ8wOOKNB5jOvPFTHknsweUz90RA0aZUgc1aQCrVXH4UFglmYcwWQDaKf3N7MNdgzjND+YkBKCc7/IIOV7rpni/+8Vkcq6spHXlCE5x9BvwOxXKCZZh9k1FA= 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=SezT9BnS; arc=none smtp.client-ip=209.85.215.180 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="SezT9BnS" Received: by mail-pg1-f180.google.com with SMTP id 41be03b00d2f7-b555ab7fabaso2341310a12.0 for ; Wed, 24 Sep 2025 05:00:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1758715215; x=1759320015; darn=lists.linux.dev; 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=UmaGbmiuxIsK0xKTEWJ/f7gfwC2bw8p0SOLh4b9Z4FY=; b=SezT9BnSFtcC8K+jetNd73VWJ4E9PGxipayuHoupiAAWMmEr4iHt3SroYvVCb2o912 xw5qAXrQ9f1gQrd4AwHMZr8hIQTW1OV8s5wFc6GEmAiHwE5duVrQtLZyDlbuV+AQ6HKE G/Lz6xKijar5KI3C/XSAguIRbVGKF+m/DVla1AyX+SQZ9S8TWwcFZd6HAQFrARj8VTFG tgAlVZQwOPkS82ajJkx20/4zivWZOKV9WCsYqb3zukbQez8ORHGk3NNz+Flp0FX8zcc3 F6VHn4V+V16LyXxC6/C1/ylupSN9YcY4cz4GQ2Buw936pKEVFPhpgwLOmQIdLImfvM1Q LyPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758715215; x=1759320015; 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=UmaGbmiuxIsK0xKTEWJ/f7gfwC2bw8p0SOLh4b9Z4FY=; b=emsqr9Ge7JUke7mUJONi6XyP2WcPlfWFvN/TattAm+LjqxYI9whSPYZDPYcESGgBfG yNcDATyhY2+6TGm9G1B+sFI2TGI37/wNwqwHYqKQWqHT9myp44KCqP/MMmsnB9C4WZwT qSVMVHU+t3+D8QxkwklIBH5IzOWzQnbbh1jynBbwdkPuLcxpI/K1WX4+GgXdI/5QWcuY nk7UCtmF5d1xPm+Csys3FRVuk7RBXEHpTEOsR2U8UdbVRFQrPEcowinDgvWuXW3i5k5c WoP1Cx4FPolnxBkf18Su6dXMiCbpoaVb1cYjqt6ccYxssvufmpTcnsjonHTvRpRrwijc Cjig== X-Forwarded-Encrypted: i=1; AJvYcCVTQuXcAmHByjuwT0cWmv83T+QerGW7R8wTvrak+XI715XjoI3nmUEB2+RreDZkuIj04XVd@lists.linux.dev X-Gm-Message-State: AOJu0YxW4JDnFfk4bTE5su+La9A+kRe1/T3KT4skmR4B8VPm9oNTmA0v Duo7kD9oxibakX2yKdoWqzmaxmDQ6vR/bi9/aqFQZ4k++652whEWSZEV X-Gm-Gg: ASbGnctkwm9Bm7G3l70Fd7GpnaaaNJZP9kXfCXHJwITMyEDzNpewGzgCaBhgKJMzeHF L0A+Cpp0Y9mA3RLPKscIRf9EZ09ePOLWiwR3fR1RZp8MERlhFAYCjO8yK9OM+5IEty6g7rolnoN WmmGRgY2LyIvZq/M4YR36LJRYeqHe04Rk54A2/KZukMU6JLFx0SpCeDgdqIzIz208STUef65PrS MoB+Jw/99E3LG2fYzh/KYOQTN3AvMTLssiZioTzpTJ7HsF/gtbqOOdcPgNAANz5j00KMSN0gz0a 1w4bDYOkV3NLAY5ibP663Jo40ukZISDhpssYzgikeFpa8PCADhNr8fEOXJMDrCo617JdtRkacU6 NqqSXvbvPcDeE/Q18GXiPzrE= X-Google-Smtp-Source: AGHT+IG5AidgxW/pjwMRKvZXF7BqnVmuGXBXEakixJFL1V8tNMywu8qGgSCIq0aUezqYi7cmWgbNjA== X-Received: by 2002:a17:903:2450:b0:268:f83a:835a with SMTP id d9443c01a7336-27cc9a91248mr60312585ad.60.1758715214591; Wed, 24 Sep 2025 05:00:14 -0700 (PDT) Received: from localhost ([103.88.46.62]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-269802de5dbsm189402185ad.84.2025.09.24.05.00.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Sep 2025 05:00:13 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Randy Dunlap , 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 v5 16/23] mm/ksw: add self-debug helpers Date: Wed, 24 Sep 2025 19:59:22 +0800 Message-ID: <20250924115931.197077-1-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250924115124.194940-1-wangjinchao600@gmail.com> References: <20250924115124.194940-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev 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 | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 4045890e5652..528001534047 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -52,5 +52,7 @@ void ksw_watch_exit(void); int ksw_watch_get(struct ksw_watchpoint **out_wp); int ksw_watch_on(struct ksw_watchpoint *wp, ulong watch_addr, u16 watch_len); int ksw_watch_off(struct ksw_watchpoint *wp); +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 f32b1e46168c..9837d6873d92 100644 --- a/mm/kstackwatch/watch.c +++ b/mm/kstackwatch/watch.c @@ -269,3 +269,37 @@ void ksw_watch_exit(void) { ksw_watch_free(); } + +/* self debug function */ +void ksw_watch_show(void) +{ + struct ksw_watchpoint *wp = current->ksw_ctx.wp; + + if (!wp) { + pr_info("nothing to show\n"); + return; + } + + pr_info("watch target bp_addr: 0x%llx len:%llu\n", wp->attr.bp_addr, + wp->attr.bp_len); +} +EXPORT_SYMBOL_GPL(ksw_watch_show); + +/* self debug function */ +void ksw_watch_fire(void) +{ + struct ksw_watchpoint *wp; + char *ptr; + + wp = current->ksw_ctx.wp; + + if (!wp) { + pr_info("nothing to fire\n"); + return; + } + + ptr = (char *)wp->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