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ast@kernel.org, ziy@nvidia.com, yuzhao@google.com, baolin.wang@linux.alibaba.com, usamaarif642@gmail.com, joel.granados@kernel.org, richard.weiyang@gmail.com, geert+renesas@glider.be, tim.c.chen@linux.intel.com, linux@treblig.org, alexander.shishkin@linux.intel.com, lillian@star-ark.net, chenhuacai@kernel.org, francesco@valla.it, guoweikang.kernel@gmail.com, link@vivo.com, jpoimboe@kernel.org, masahiroy@kernel.org, brauner@kernel.org, thomas.weissschuh@linutronix.de, oleg@redhat.com, mjguzik@gmail.com, andrii@kernel.org, wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, 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: H4sIAAAAAAAAAzWSa0iTcRSH+7/Xbbh4WYZvViQjjczKUuMQJQkF76co/FJ2c+RLG+qUWToF aVGalpqN1Jp5n7Zs4ZqK00SXaKRWWpmsmObUVhYmXvPWZVP8cnjgPL/f+XIEuCSb9BYolJd5 lVIWI6VEhGjco2y3OHhQHrhY4QFfZjMQ/F4qxCHPMUpBwdg1AiaqshDonIU0/MmPhqU3PTgU 5PUi+G66iaDu5SCCD6PrwZ6vxaA7txyDwoLr7vEdg4WqahpeV9gJGDboaFh27IOfTi0FDZoh GoxZThzMI/0kPCi2U5DxZ8ZV1PSQgixTPQmduscEOIZsJPycq8LhvbUUA61zioYp/RwBlTO/ cLDn/CAgXf8Mg75PzxFUGsZJMBv7KfimK8KgX1tCQddiFwbDOeOuWNFfEvKWMyiYN42QUNgx SB8J5IzFRsR1lbNco26A5krNV7hagz9X0TyGcebqTIp7dX+J4Mo0eThX3HmSq9Vf5bKv/6K4 xrQvJDf59TPBTbR8pLiauo/EiY0RokNRfIwikVftDY0UycvNj+j4dk/1j5cWWoOGmVtIKGCZ YPbWuzFsjW8vayg3U8wO1mZbwN3syfiwtdlO0s04072F7X8X4OYNzBl2uvkt4WaC8WUbm96v sJgJYedbe8nVzm3sE5N1pUfIHGA/OLpXHInLSZu44borcjklQrazr5ZeDWxiXxhsRC4Sl6J1 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2Evzv/1vab5msADzLwo5/mzTAt6e72H47EcfmC2rtkvWxAkJKq2gXrQuVqIstN5gUp6GHfjq qGLSUSd7HIlFHBvJnRhJp0NMs3O49++HyRCHsbM42ykvFWKSbZzBuZ3zQzyZ3cH1VzfjEGM2 grM/eD3OUnY59+txC/WvcyZnqagd7xGzKzhXR+O4Iws6Ol82kYskBWhCKQpTJWkTFaqE5Qs1 8crUJNWBhbuTE60o+E3mQyNnq9CAK7oOsSIknyh1RniUMkqh1aQm1iFORMrDpLElrUqZNE6R elBQJ8eo9yUImjoULsLyadIN24RYGbtHsVeIF4QUQf0/JUTi6enI/Wv0CTHXH1OqXfy9s/pp 1K7oVqUnZspSY3hzQCI6tPaILPBj1dBbZ2LxvGWDVc3nPrlmn5dlp7hPp02t9L7sv45jIvPP uW1pV2v7qm/uzFk/Y1nlUUvy9fC19psrceYFMfG1/lnbfX98WoqkYatFWyTuvvJu80Zfb9xh r2aN82iUHGuUiiVzSbVG8Rd7PnfISQMAAA== X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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 =20 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 =20 #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(con= st struct pt_regs *); @@ -86,6 +87,12 @@ static __always_inline bool do_syscall_x32(struct pt_reg= s *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 =3D syscall_enter_from_user_mode(regs, nr); =20 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 =20 #include /* boot_cpu_has, ... */ #include /* dotraplinkage, ... */ @@ -1219,6 +1220,12 @@ void do_user_addr_fault(struct pt_regs *regs, tsk =3D current; mm =3D tsk->mm; =20 + /* + * 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)) =3D=3D X86_PF_IN= STR)) { /* * Whoops, this is kernel mode code trying to execute from --=20 2.17.1