From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DFCDDC982FA for ; Tue, 22 Sep 2026 14:00:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Type:MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To :Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=bpWKQAePDYSFuH3x8d4MukUyj81xs2YsXJAnqzR8o3k=; b=hVGid3fmkFkGJB8ynR/3HSqScT o4srRy488LJKnAHrs7HUl6GnTgxz2MnAwD0Yk5z1BewGAAPeYwcbmRXZUDPlbQM9WdD9gg8cer9U1 TNGreOZCvkrtv7+97jG9VYWyNOEUjD4+O+0Vvmj8x36PcumDweqF0AhoI6T4/qIQZR6mr3uUHJVeO 1LYbvslGGEdAAL58tDyOV2oDlKHAaNAcpiXSLCLGlppomWu/WAlyHsr0JpmB1i48+olqUWsTrsYX0 EFo/KXA1acu5DO5ITSBN82+GsFyh1Us1TGpsEkytla1BjdMHVPQTODWxENT8OqfmmHn04npL8mVfl W0hNJP+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9130-00000005cWc-1CHY; Tue, 22 Sep 2026 14:00:38 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x912y-00000005cVh-0z2V for linux-arm-kernel@bombadil.infradead.org; Tue, 22 Sep 2026 14:00:36 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=bpWKQAePDYSFuH3x8d4MukUyj81xs2YsXJAnqzR8o3k=; b=LyaY09/EBcN63URQyZtxw88jfD rTIpliKgagx23jXK54/rMB9gX3wShXCfOhJoYGzL1RCST7pbkL7fwE47pM9S+0rzrn+SIH0PYW2MB yB/tFWhL6v/U0TQF/W2M5UvYE1MV9HSPvIqLHUgFMEXJ5Py5CcRqxG/UBHMCyjnb0P0ZIL1+MG/Tp ql8wQ5F0tsGJAi3N2gW+4cVFDXmJQBYTlTvpXpjnJeKVKXpCB6PS7CBVTrHIm3vbk0YKFizcG0dJE FqRj/8gJ37y6HlBI0usB6ZAXGMj4YdpceKgkz+AY4pDckQgg9ZKV31r3H1cObHpekAB/roac1EtDx pEG8WbeQ==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.99.2 #2 (Red Hat Linux)) id 1x912v-0000000DfQL-0vDb for linux-arm-kernel@lists.infradead.org; Tue, 22 Sep 2026 14:00:35 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F192D152B; Tue, 22 Sep 2026 07:00:25 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A6E923F86F; Tue, 22 Sep 2026 07:00:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790085629; bh=aMSPwsonXUOJ1aXDqudRz657VCrZXxupM1rNcnO98Fg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RkLVk7FJUB6giUbh1Fn6LMGtU3EEBobOs9n5spdUMz3YF+mIhVVDbq6fPqZ+WuNQx j5xQMBRSifB210fwLNNDOKVqnq0urdF7wEdPopC125+vKEKu+rbhPoQWVhpoHICqZh 0npYJQEaeuaNMZlcSAzrfnFfCUvpgu6SDBTFXikw= Date: Tue, 22 Sep 2026 15:00:25 +0100 From: Catalin Marinas To: Will Deacon Subject: Re: [PATCH v2 20/21] arm64: tracing: Advertise a mode of EL1t in synthetic kernel regs Message-ID: References: <20260918161407.2300-1-will@kernel.org> <20260918161407.2300-21-will@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260918161407.2300-21-will@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260922_150033_515068_7911B92E X-CRM114-Status: GOOD ( 12.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Vladimir Murzin , Arnd Bergmann , Marc Zyngier , Linus Walleij , linux-kernel@vger.kernel.org, Mostafa Saleh , David Hildenbrand , Lorenzo Stoakes , Oliver Upton , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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