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Mon, 10 Nov 2025 08:38:01 -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 18/27] arm64/hw_breakpoint: Add arch_reinstall_hw_breakpoint Date: Tue, 11 Nov 2025 00:36:13 +0800 Message-ID: <20251110163634.3686676-19-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-Queue-Id: C9CD8A000D X-Rspamd-Server: rspam07 X-Stat-Signature: 6dhz8epu4e3yxormaoi7m5wu18jbut9b X-Rspam-User: X-HE-Tag: 1762792682-902436 X-HE-Meta: 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 SQ5DiRww 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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: Add arch_reinstall_hw_breakpoint() to restore a hardware breakpoint in an atomic context. Unlike the full uninstall and reallocation path, this lightweight function re-establishes an existing breakpoint efficiently and safely. This aligns ARM64 with x86 support for atomic breakpoint reinstalls. --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/hw_breakpoint.h | 1 + arch/arm64/kernel/hw_breakpoint.c | 5 +++++ 3 files changed, 7 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6663ffd23f25..fa35dfa2f5cc 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -232,6 +232,7 @@ config ARM64 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && \ HW_PERF_EVENTS && HAVE_PERF_EVENTS_NMI select HAVE_HW_BREAKPOINT if PERF_EVENTS + select HAVE_REINSTALL_HW_BREAKPOINT if PERF_EVENTS select HAVE_IOREMAP_PROT select HAVE_IRQ_TIME_ACCOUNTING select HAVE_LIVEPATCH diff --git a/arch/arm64/include/asm/hw_breakpoint.h b/arch/arm64/include/asm/hw_breakpoint.h index bd81cf17744a..6c98bbbc6aa6 100644 --- a/arch/arm64/include/asm/hw_breakpoint.h +++ b/arch/arm64/include/asm/hw_breakpoint.h @@ -119,6 +119,7 @@ extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, unsigned long val, void *data); extern int arch_install_hw_breakpoint(struct perf_event *bp); +extern int arch_reinstall_hw_breakpoint(struct perf_event *bp); extern void arch_uninstall_hw_breakpoint(struct perf_event *bp); extern void hw_breakpoint_pmu_read(struct perf_event *bp); extern int hw_breakpoint_slots(int type); diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c index ab76b36dce82..bd7d23d7893d 100644 --- a/arch/arm64/kernel/hw_breakpoint.c +++ b/arch/arm64/kernel/hw_breakpoint.c @@ -292,6 +292,11 @@ int arch_install_hw_breakpoint(struct perf_event *bp) return hw_breakpoint_control(bp, HW_BREAKPOINT_INSTALL); } +int arch_reinstall_hw_breakpoint(struct perf_event *bp) +{ + return hw_breakpoint_control(bp, HW_BREAKPOINT_RESTORE); +} + void arch_uninstall_hw_breakpoint(struct perf_event *bp) { hw_breakpoint_control(bp, HW_BREAKPOINT_UNINSTALL); -- 2.43.0