From: Catalin Marinas <catalin.marinas@arm.com>
To: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Ard Biesheuvel <ardb@kernel.org>,
Ada Couprie Diaz <ada.coupriediaz@arm.com>,
David Hildenbrand <david@kernel.org>,
Vladimir Murzin <vladimir.murzin@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Mostafa Saleh <smostafa@google.com>,
Lorenzo Stoakes <ljs@kernel.org>,
Oliver Upton <oupton@kernel.org>,
Linus Walleij <linusw@kernel.org>, Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH v2 20/21] arm64: tracing: Advertise a mode of EL1t in synthetic kernel regs
Date: Tue, 22 Sep 2026 15:00:25 +0100 [thread overview]
Message-ID: <arKJ-T7fltE9u8qG@arm.com> (raw)
In-Reply-To: <20260918161407.2300-21-will@kernel.org>
On Fri, Sep 18, 2026 at 05:14:04PM +0100, Will Deacon wrote:
> When synthesising a kernel regs structure for ftrace or perf, advertise
> a mode of EL1t to reflect the mode in which the kernel runs for the vast
> majority of the time.
For consistency, not that it makes any difference in practice, should we
also do:
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 79a19be88ced..c7f954f1ddbf 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -489,7 +489,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
* be initialized by start_thread() or start_compat_thread().
*/
memset(childregs, 0, sizeof(struct pt_regs));
- childregs->pstate = PSR_MODE_EL1h | PSR_IL_BIT;
+ childregs->pstate = PSR_MODE_EL1t | PSR_IL_BIT;
childregs->stackframe.type = FRAME_META_TYPE_FINAL;
p->thread.cpu_context.x19 = (unsigned long)args->fn;
--
Catalin
next prev parent reply other threads:[~2026-09-22 14:00 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 16:13 [PATCH v2 00/21] arm64: Move overflow sp into SP_EL1 and kernel sp into SP_EL0 Will Deacon
2026-09-18 16:13 ` [PATCH v2 01/21] arm64: entry: Defer setting of TPIDRRO_EL0 until exit to userspace Will Deacon
2026-09-30 20:47 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 02/21] arm64: entry: Only check for stack overflow on exceptions from EL1 Will Deacon
2026-09-30 20:50 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 03/21] arm64: stackprotector: Temporarily disable per-task stackprotector Will Deacon
2026-09-30 21:01 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 04/21] arm64: bpf: Add support for generating reads of TPIDRRO_EL0 Will Deacon
2026-09-30 20:53 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 05/21] KVM: arm64: Protect TPIDRRO_EL0 across guest entry/exit Will Deacon
2026-09-30 20:55 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 06/21] arm64: Store 'current' in TPIDRRO_EL0 instead of SP_EL0 Will Deacon
2026-09-30 20:58 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 07/21] selftests/bpf: arm64: Use TPIDRRO_EL0 instead of SP_EL0 for 'current' Will Deacon
2026-09-30 20:58 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 08/21] scripts/gdb: " Will Deacon
2026-09-30 20:59 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 09/21] arm64: stackprotector: Re-enable per-task stackprotector Will Deacon
2026-09-30 21:00 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 10/21] arm64: percpu: Specialise set_my_cpu_offset() for the primary CPU Will Deacon
2026-09-30 21:02 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 11/21] arm64: percpu: Annotate __kern_my_cpu_offset() as '__always_inline' Will Deacon
2026-09-30 21:05 ` Linus Walleij
2026-09-30 21:05 ` Linus Walleij
2026-09-18 16:13 ` [PATCH v2 12/21] KVM: arm64: Preserve handler/thread bit of EL1 mode in __finalise_el2() Will Deacon
2026-09-18 16:13 ` [PATCH v2 13/21] arm64: sdei: Guard most of asm/sdei.h with CONFIG_ARM_SDE_INTERFACE Will Deacon
2026-09-18 16:13 ` [PATCH v2 14/21] arm64: sdei: Support SDEI events from kernel handler and thread modes Will Deacon
2026-09-18 16:13 ` [PATCH v2 15/21] arm64: entry: Point SP_EL0 at the overflow stack Will Deacon
2026-09-21 15:56 ` Catalin Marinas
2026-09-18 16:14 ` [PATCH v2 16/21] arm64: entry: Implement EL1t exception handlers for " Will Deacon
2026-09-30 21:17 ` Linus Walleij
2026-09-18 16:14 ` [PATCH v2 17/21] arm64: entry: Use SPSel to switch to " Will Deacon
2026-09-30 21:22 ` Linus Walleij
2026-09-18 16:14 ` [PATCH v2 18/21] arm64: entry: Split up kernel_ventry macro into separate helper macros Will Deacon
2026-09-30 21:26 ` Linus Walleij
2026-09-18 16:14 ` [PATCH v2 19/21] arm64: entry: The great stack switcheroo Will Deacon
2026-09-19 11:41 ` Bradley Morgan
2026-09-22 13:51 ` Catalin Marinas
2026-09-30 21:36 ` Linus Walleij
2026-10-01 7:27 ` Will Deacon
2026-10-01 8:38 ` Linus Walleij
2026-10-01 11:32 ` Will Deacon
2026-10-01 11:35 ` Linus Walleij
2026-09-18 16:14 ` [PATCH v2 20/21] arm64: tracing: Advertise a mode of EL1t in synthetic kernel regs Will Deacon
2026-09-22 14:00 ` Catalin Marinas [this message]
2026-09-18 16:14 ` [PATCH v2 21/21] arm64: Rename 'overflow_stack' and OVERFLOW_STACK_SIZE Will Deacon
2026-09-22 14:01 ` Catalin Marinas
2026-09-24 12:30 ` [PATCH v2 00/21] arm64: Move overflow sp into SP_EL1 and kernel sp into SP_EL0 Usama Anjum
2026-09-30 21:42 ` Linus Walleij
2026-10-01 7:21 ` Will Deacon
2026-10-01 9:00 ` Muhammad Usama Anjum
2026-10-01 21:19 ` Linus Walleij
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