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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 08/47] x86_64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64 Date: Thu, 2 Oct 2025 17:12:08 +0900 Message-Id: <20251002081247.51255-9-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: H4sIAAAAAAAAAzWSWUwTaxTH/Wa+mSkN1bGiDO5pJMZ9CZgTc2OuvjiaGDU+uCZaZbRVKFoW QUNShHqJCGIVjYBSVBBsldKqYatW1CpWpAVEUAsWFaLCJUEoikgtGN9+J//l5CRHREpbqaki pSpWUKvkkTJajMU9gQWLJGFtiqV3hqZAc7INw0B/Goa8UiMNaeZLFDhvGxBoK3wYfunsDPT/ eMuAz2pHcMGlI8F4J5mAb6YRGr4+6kPw+cla6GmvosDn7iLgtbcbQdHHEQI+2v5DkH/VQkOB x02CtfgEDZ+y7pLQNNBLQ212Og09rjwC/jfRoD9hpeByrg5ByrVSGi5cNmOoeF/JgOvrMAEG 8wZoL+rEcPGzXysLhuxbVQQUaUIht67Rv1cfDXZDFwPuM9kYbvfUU1Db1kxB+9OTFJhbnyDo b/IQkFY5gMH6ZgEUnLyOodpai8Fe3kFAm9FHgSZ30H+2zUFBg8GJobSrhQCH/RmG+spbFBS+ 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1759392803-98319 X-HE-Meta: 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 UXZgnIfF tKxfyEzCT6Pa4xoEtor/2iyTw9WB5ZLcG/Yim1eKGeNDMv/veMk4QokeiCuuGvUZCSJ8L35bSlR8bkjJVLGjQ1ZU4iEimuBIQnOJV2KYcjypiA88DjSn9EWFjqQnNUWgj/1jq 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 x86_64 and add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64. Signed-off-by: Byungchul Park --- arch/x86/Kconfig | 1 + arch/x86/entry/syscall_64.c | 7 +++++++ arch/x86/mm/fault.c | 7 +++++++ 3 files changed, 15 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 05880301212e..46021cf5934b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -38,6 +38,7 @@ config X86_64 select ZONE_DMA32 select EXECMEM if DYNAMIC_FTRACE select ACPI_MRRM if ACPI + select ARCH_HAS_DEPT_SUPPORT config FORCE_DYNAMIC_FTRACE def_bool y diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c index b6e68ea98b83..66bd5af5aff1 100644 --- a/arch/x86/entry/syscall_64.c +++ b/arch/x86/entry/syscall_64.c @@ -8,6 +8,7 @@ #include #include #include +#include #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(const struct pt_regs *); @@ -86,6 +87,12 @@ static __always_inline bool do_syscall_x32(struct pt_regs *regs, int nr) /* Returns true to return using SYSRET, or false to use IRET */ __visible noinstr bool do_syscall_64(struct pt_regs *regs, int nr) { + /* + * This is a system call from user mode. Make dept work with a + * new kernel mode context. + */ + dept_update_cxt(); + add_random_kstack_offset(); nr = syscall_enter_from_user_mode(regs, nr); diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 998bd807fc7b..017edb75f0a0 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -19,6 +19,7 @@ #include #include /* find_and_lock_vma() */ #include +#include #include /* boot_cpu_has, ... */ #include /* dotraplinkage, ... */ @@ -1219,6 +1220,12 @@ void do_user_addr_fault(struct pt_regs *regs, tsk = current; mm = tsk->mm; + /* + * This fault comes from user mode. Make dept work with a new + * kernel mode context. + */ + dept_update_cxt(); + if (unlikely((error_code & (X86_PF_USER | X86_PF_INSTR)) == X86_PF_INSTR)) { /* * Whoops, this is kernel mode code trying to execute from -- 2.17.1