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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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/as= m/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 notif= ier_block *unused, unsigned long val, void *data); =20 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_break= point.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); } =20 +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); --=20 2.43.0