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Mon, 10 Nov 2025 08:36:49 -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 02/27] x86/hw_breakpoint: Add arch_reinstall_hw_breakpoint Date: Tue, 11 Nov 2025 00:35:57 +0800 Message-ID: <20251110163634.3686676-3-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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: EE91C40016 X-Stat-Signature: dtd5wmtyhdqf3x38j3huwqdorwrr33rh X-Rspam-User: X-HE-Tag: 1762792610-684764 X-HE-Meta: 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 YUOWXMj3 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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: The new arch_reinstall_hw_breakpoint() function can be used in an atomic context, unlike the more expensive free and re-allocation path. This allows callers to efficiently re-establish an existing breakpoint. Signed-off-by: Jinchao Wang Reviewed-by: Masami Hiramatsu (Google) --- arch/x86/include/asm/hw_breakpoint.h | 2 ++ arch/x86/kernel/hw_breakpoint.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/x86/include/asm/hw_breakpoint.h b/arch/x86/include/asm/hw_breakpoint.h index aa6adac6c3a2..c22cc4e87fc5 100644 --- a/arch/x86/include/asm/hw_breakpoint.h +++ b/arch/x86/include/asm/hw_breakpoint.h @@ -21,6 +21,7 @@ struct arch_hw_breakpoint { enum bp_slot_action { BP_SLOT_ACTION_INSTALL, + BP_SLOT_ACTION_REINSTALL, BP_SLOT_ACTION_UNINSTALL, }; @@ -65,6 +66,7 @@ extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, int arch_install_hw_breakpoint(struct perf_event *bp); +int arch_reinstall_hw_breakpoint(struct perf_event *bp); void arch_uninstall_hw_breakpoint(struct perf_event *bp); void hw_breakpoint_pmu_read(struct perf_event *bp); void hw_breakpoint_pmu_unthrottle(struct perf_event *bp); diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c index 3658ace4bd8d..29c9369264d4 100644 --- a/arch/x86/kernel/hw_breakpoint.c +++ b/arch/x86/kernel/hw_breakpoint.c @@ -99,6 +99,10 @@ static int manage_bp_slot(struct perf_event *bp, enum bp_slot_action action) old_bp = NULL; new_bp = bp; break; + case BP_SLOT_ACTION_REINSTALL: + old_bp = bp; + new_bp = bp; + break; case BP_SLOT_ACTION_UNINSTALL: old_bp = bp; new_bp = NULL; @@ -187,6 +191,11 @@ int arch_install_hw_breakpoint(struct perf_event *bp) return arch_manage_bp(bp, BP_SLOT_ACTION_INSTALL); } +int arch_reinstall_hw_breakpoint(struct perf_event *bp) +{ + return arch_manage_bp(bp, BP_SLOT_ACTION_REINSTALL); +} + void arch_uninstall_hw_breakpoint(struct perf_event *bp) { arch_manage_bp(bp, BP_SLOT_ACTION_UNINSTALL); -- 2.43.0