From nobody Fri Dec 19 17:19:26 2025 Received: from invmail4.hynix.com (exvmail4.hynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2E72B266B76; Mon, 19 May 2025 09:18:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747646330; cv=none; b=fQxmiiate4GSyaFSl6bW5P5ZEF9PQ7pHwkx6xBrYrxMaryDSa24cQjUgHKJI/5mBewatE4bgk6h3LtqY6osTQmdsnN1RNl3JlpHjp3ib5hgGaW/X+yWKADaQ+HEbRHnmSCu5Z0YiBrilQBahoNhNhEaewUOZ/FkQNYXWiSAKpro= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747646330; c=relaxed/simple; bh=BG7AZBSjSmF6NrOFDpw8Rk4CMPwauNC98FDvthYcPSo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=TcKULzPIS3gyvRzWIn6Joe44xPe4s/lIYMZvmdEOR/BFGK4NziKYsCNSMXEVXlcl7vWqGRxHlrhpNAo8FTzwyUt8OtDEnZxV5vbGlQGnxdquG1q1HY90WVFBdAFUo6t8etOLuk/Ja86RpN77hHOsaH6LNSXA8AjbmMm/XLC575c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-669ff7000002311f-74-682af76de41b From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, harry.yoo@oracle.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, yskelg@gmail.com, yunseong.kim@ericsson.com, yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v16 09/42] arm64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to arm64 Date: Mon, 19 May 2025 18:17:53 +0900 Message-Id: <20250519091826.19752-10-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250519091826.19752-1-byungchul@sk.com> References: <20250519091826.19752-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSa0hTYRjHe99zm6vVaUWd7jEYlWJldHmCCulDnT4UQRRlQa48tdVcNcuc FGjNMs1RkkkXdVpM0Vl2FnSdLcWVibXS1MRLjtKNNg1zM8suW9KXhx/P5ff/8kgI+UtqpkSj Oy7odSqtgpaSUv+EkmjdcKR6aYNDAYGhTBJu3rXS4LpTgcB6Px2Dt24jtAZ9CH42viEgP8+F oLink4D7zi4E9rIzNDR9mgjNgQEa6vOyaTh76y4Nb7+MYui4mouhQtwM3ZZeEhoulWDI99Jw I/8sDhUPhhFLOQOWNCW4y64zMNoTA/VdLRTY26PgWmEHDU/t9SQ4H7oxND2+SUOX9Q8FDc6X JARNs8B1OYeCyv4SGr4ELQRYAgMMvHOYMTjN06DKGBKe+/abghc5Dgznbt/D0PzhCYLqzI8Y RGsLDbUBHwabmEfAj9I6BG6Tn4GMiyMM3Eg3IcjOuEqCsWMF/PweSi4YioH0oioSKn+1oNi1 vLXQivha3wDBG20n+R+B9zRvD5pJ/lUJxz+63snwxup2hjeLJ3hbWSR/66kX88WDAYoXyy/Q vDiYy/BZ/mbM979+zWydHSddkyBoNcmCfsm6eKn6xVAlPlovT+mrzsVpyDQpC0VIOHY51/3K hf9zf2ktCjPNLuDa2kaIME9l53O2nF4qC0klBNsynmst+PBvaQq7i3v3+A0dZpJVck/Si6kw y9iVXMblVnpMOo+rqHL8E0WE+u3ZYwFydgXXXFFIhqUcmx/B/cnIJMcOZnDPy9rIS0hmRuPK kVyjS05UabTLF6sNOk3K4v1HEkUU+i/L6dHdD9Gga1sNYiVIMUFWZV+kllOq5CRDYg3iJIRi qqzctlAtlyWoDKmC/she/QmtkFSDZklIxXTZsuDJBDl7UHVcOCwIRwX9/ymWRMxMQ9xB0+Sv 95SrlJ4D81P87tXvlVv6ivI+dis7BU98lDf1lCFt+0pxntObuqmRcG94tqNx55XJcWtik6eV 9hi0bFPc7wPnP3Xv+fYguM+TQO7uOzQULfeZPJnDpmNR43sXrb9ijl0dP1dTLQ7n+pi14y4c c6ibRg6tT2k8X/DZuNU/R0EmqVUxkYQ+SfUXE5tQ7VsDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAAzWSf0iTeRzH+36fn65WDzuph6ROBmYZdQkZHyiiCOqh644oq7v6w3b1cBtO 022ZBoFrGp3LkR4mZ802jSnzUdcmnJUTUbKbkpouNTFTC038sX64lWl2s+ifDy8+7w+v9z8f llA4qbWsJtUg6lJVWiUtI2W/7jRtSfkQp94WGt8IwdmrJNyqlWjoqqlCINUZMUw8PAB9oSkE 8487CSgu6kJgH3lOQF3rEAJv5WUael6tBH8wQIOvyEyDqbyWhieTCxgGbxRiqHL/Ai8cYyS0 Xy/DUDxBw81iEw6P1xjmHE4GHNkxMFpZwsDCSDz4hnopaLH6KPAObIZ/SgdpaPD6SGitH8XQ c/8WDUPSFwraW/8jIWSJgq6CfAqqZ8pomAw5CHAEAwx0N9kwtNpWgysnbL3yfpGCR/lNGK7c uYvB/+wBgsarwxjcUi8NLcEpDB53EQGfKh4iGLVMM5B7bY6Bm0YLAnPuDRJyBhNg/mO42Tob D8bbLhKqP/eiPbsFqVRCQstUgBByPBeET8GntOAN2UihrYwX7pU8Z4ScxgFGsLnPC57KOKG8 YQIL9ndBSnA7/6IF97tCRsib9mNhpqODObzupGzXWVGryRB1P+0+LVM/mq3GaT5F5nhjIc5G llV5KILlue38TEULWmKai+X7++eIJY7konlP/hiVh2QswfUu5/usz74e/cD9znff76SXmORi +AdGO7XEcm4Hn1vQR3+T/shXuZq+iiLC+wHztwIFl8D7q0rJ60hmQ8ucKFKTmpGi0mgTtuqT 1VmpmsytZ86luFH4gxyXFgrq0WzPgWbEsUi5Qu7yblIrKFWGPiulGfEsoYyUOz0b1Qr5WVXW RVF3Lkl3Xivqm1EUSyrXyA+eEE8ruD9VBjFZFNNE3fcUsxFrs9F+uXWffa7NerTkzPGxvYvR wZg6nb/ij3TbISkT/Xbq7+WSf8O6hrEeMzOyfSf8/FIqX/9vbIf62GT0nTitPKo5sTjKdW/V mkIImWv2WIZNSdMT7fVGU9bRw/NvDNWBI9pkw0KdoXv00nEI2RMD6W9JNj12uKZ+3LmonP6o PKQk9WpVfByh06v+B0+8G4g9AwAA 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 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 a182295e6f08..6c69598a6423 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -279,6 +279,7 @@ config ARM64 select HAVE_SOFTIRQ_ON_OWN_STACK select USER_STACKTRACE_SUPPORT select VDSO_GETRANDOM + select ARCH_HAS_DEPT_SUPPORT help ARM 64-bit (AArch64) Linux support. =20 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 =20 #include #include @@ -96,6 +97,12 @@ static void el0_svc_common(struct pt_regs *regs, int scn= o, int sc_nr, * (Similarly for HVC and SMC elsewhere.) */ =20 + /* + * 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 ec0a337891dd..0fcc3dc9c2a9 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -26,6 +26,7 @@ #include #include #include +#include =20 #include #include @@ -616,6 +617,12 @@ static int __kprobes do_page_fault(unsigned long far, = unsigned long esr, if (!(mm_flags & FAULT_FLAG_USER)) goto lock_mmap; =20 + /* + * This fault comes from user mode. Make dept work with a new + * kernel mode context. + */ + dept_update_cxt(); + vma =3D lock_vma_under_rcu(mm, addr); if (!vma) goto lock_mmap; --=20 2.17.1