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linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH v17 09/47] arm64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to arm64 Date: Thu, 2 Oct 2025 17:12:09 +0900 Message-Id: <20251002081247.51255-10-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251002081247.51255-1-byungchul@sk.com> References: <20251002081247.51255-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzXSbUxTZxQHcJ/72laqN9W46/tSQ4z4MjGdOSY6F2OyJ4vTReMHZ6I2cLUN ULQowrJlVQEZbpE0KUYq0MJSm1Id3hKVag2ChWGjtKEKgxXsZJ0ESrMGMAjYtRi//fI//3M+ HQmp6KdXSLS6s4Jep85VMjJKFk2zbparBjVbXZ3roFy8TsPQZDmCtzNmEkpbEhTMGTtYmJge YCHh6UBQFTCS4Gy+QMBoexyBKTzMwLWRCxTEbL8gqI6YWRjxfgWJ0L8E9E6NIbANvydguPUy grmqHKirdzEw86ybhGsmPwJrOETCm6bksLljEIHHfpGBnuFFEJyMMdBlusJANHCDgPEmBiwX PTRcavidgaoakYKWV24WAqOzBDSK38CQLUKBr7KeANOtBwRM2xws2AzpYH7WQ8Pf9moWZsOZ ELpqouB2tJuGrsGXNIxGjAwMdZbRcM/wigXxTy+CiWCYgHL3JAXi62TF078RrGW/UfDQ00VB 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1759392805-723219 X-HE-Meta: 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 ygG6XJZ8 7aP+O4BcifHKtqDDCUvNXr1v/4heWSnE6CSdOwFbm1xTJYV9RvpfpsbudNAamuY98gPiuQeQijg9H/UY6N4rCON9Pgw== 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: dept needs to notice every entrance from user to kernel mode to treat every kernel context independently when tracking wait-event dependencies. Roughly, system call and user oriented fault are the cases. Make dept aware of the entrances of arm64 and add support CONFIG_ARCH_HAS_DEPT_SUPPORT to arm64. Signed-off-by: Byungchul Park --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/syscall.c | 7 +++++++ arch/arm64/mm/fault.c | 7 +++++++ 3 files changed, 15 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e9bbfacc35a6..a8fab2c052dc 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -281,6 +281,7 @@ config ARM64 select USER_STACKTRACE_SUPPORT select VDSO_GETRANDOM select VMAP_STACK + select ARCH_HAS_DEPT_SUPPORT help ARM 64-bit (AArch64) Linux support. diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index c442fcec6b9e..bbd306335179 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include @@ -96,6 +97,12 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr, * (Similarly for HVC and SMC elsewhere.) */ + /* + * This is a system call from user mode. Make dept work with a + * new kernel mode context. + */ + dept_update_cxt(); + if (flags & _TIF_MTE_ASYNC_FAULT) { /* * Process the asynchronous tag check fault before the actual diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index d816ff44faff..96827b999d18 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -622,6 +623,12 @@ static int __kprobes do_page_fault(unsigned long far, unsigned long esr, if (!(mm_flags & FAULT_FLAG_USER)) goto lock_mmap; + /* + * This fault comes from user mode. Make dept work with a new + * kernel mode context. + */ + dept_update_cxt(); + vma = lock_vma_under_rcu(mm, addr); if (!vma) goto lock_mmap; -- 2.17.1