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Mon, 29 Sep 2025 19:45:40 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Randy Dunlap , Marco Elver , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. 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Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v6 16/23] mm/ksw: add self-debug helpers Date: Tue, 30 Sep 2025 10:43:37 +0800 Message-ID: <20250930024402.1043776-17-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250930024402.1043776-1-wangjinchao600@gmail.com> References: <20250930024402.1043776-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5FA78120007 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: t7sgsbkk6kfkrkxbm7a17g379s6j7eqq X-HE-Tag: 1759200342-734702 X-HE-Meta: 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 1BtLuzsS 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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