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Fri, 12 Sep 2025 03:12:07 -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 02/21] x86/hw_breakpoint: Add arch_reinstall_hw_breakpoint Date: Fri, 12 Sep 2025 18:11:12 +0800 Message-ID: <20250912101145.465708-3-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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 98CC540003 X-Stat-Signature: eo9ycrd7jf8t98sqbccwft4pgxpctcox X-HE-Tag: 1757671929-782489 X-HE-Meta: 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 8hE+aN9l 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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 --- 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