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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9EB0C49361 for ; Sun, 20 Jun 2021 08:14:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98DEE61002 for ; Sun, 20 Jun 2021 08:14:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229579AbhFTIQq (ORCPT ); Sun, 20 Jun 2021 04:16:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55804 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229533AbhFTIQp (ORCPT ); Sun, 20 Jun 2021 04:16:45 -0400 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0E8DC061760 for ; Sun, 20 Jun 2021 01:14:32 -0700 (PDT) Received: by mail-pg1-x52a.google.com with SMTP id t9so11524202pgn.4 for ; Sun, 20 Jun 2021 01:14:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=XIV/ZVf9L9J0riDbCeYYDPLzprfr30uDHayyxURrcKc=; b=F0jWf2bDCUvr1D08Jyrfl9SdaGw4rgAcivmBfqWQivEkAf0RnzT9CA2Sg69TtcD4cs /yKtrPQ93a7wjA2RaupaIGOyLh9xia/oulQ26wmYJnLMJo0LaZbcG1mlNiVMuBK88mSp 1gLTZLNIblRPXUx6Hzeq+s7/0PWLc/VueMi8i0ToEAPEixYIgHwMdYmqsf2FAPvFZuFL KxR9XlQhgno6Sn0rXNOIhYkih2zi5BLDropZF4InZeocnP4C39x0hRqFtCPgsRyHzgIY yf5RpxV8PUF663hQNqdPBVR0LS9FG93sTzxEyzbgpjqjuSnzYSd7VS5UfVsNzzr/9ieZ 9pEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=XIV/ZVf9L9J0riDbCeYYDPLzprfr30uDHayyxURrcKc=; b=Q7nvjt3RZ+QFEYirT3CR15K1zAHGjyULBskzfW9RxINX+v2QaCmriGpqY6/jF+C2pM R68QpaNBXYR1S86gd4/Id5625R9UblbtMD5BcJxQoeBPDME88RXFooSbzXzWKvJPAQBh pXKu6//gQ4UzKfI/ZduYL/0g/ajLDJdGanbvhxAcldqaSDXjiRVG69SQM2ghmSPcRHQz Zgrw+uj0A054McWJLHX/01LC9ZUs03wnSgNHkhKSKBWBkIEXn2s6l+4F/5ZbiyChpOYi yywIbRGT/ZF6EagMuM/AdbZH9fjozw0dlr1WVk0n0IxsxaHLYw6jnSpCNwRj2sYfv72X x8qA== X-Gm-Message-State: AOAM530g9pjRHxyXLgxj0NqrWHLL6Dwx2ZWrwO3ihGjUAFRxnwpoN72Z b9+/xuXo6yrQjeVjxK7IrTo= X-Google-Smtp-Source: ABdhPJywG3sIj+1VcRiEom34FMI1obI0+/CubUmbo5lC/Stu0oXW9zNhOkBQ15Uk9x+9kPhoNiHCOg== X-Received: by 2002:a62:1d0e:0:b029:2d8:30a3:687f with SMTP id d14-20020a621d0e0000b02902d830a3687fmr13553412pfd.17.1624176871953; Sun, 20 Jun 2021 01:14:31 -0700 (PDT) Received: from xplor.waratah.dyndns.org (222-152-189-137-fibre.sparkbb.co.nz. [222.152.189.137]) by smtp.gmail.com with ESMTPSA id a9sm15012778pjm.51.2021.06.20.01.14.30 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 20 Jun 2021 01:14:31 -0700 (PDT) Received: by xplor.waratah.dyndns.org (Postfix, from userid 1000) id 72101360145; Sun, 20 Jun 2021 20:14:27 +1200 (NZST) From: Michael Schmitz To: geert@linux-m68k.org, linux-arch@vger.kernel.org, linux-m68k@lists.linux-m68k.org Cc: ebiederm@xmission.com, torvalds@linux-foundation.org, schwab@linux-m68k.org Subject: [PATCH v3] m68k: improved switch stack handling Date: Sun, 20 Jun 2021 20:14:22 +1200 Message-Id: <1624176865-15570-1-git-send-email-schmitzmic@gmail.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org m68k version of Eric's 'improved switch stack handling' patch for alpha. The first two patches address m68k missing saving switch_stack on those syscalls that can may call ptrace_stop(), and adding a full stack frame in kernel threads. The last patch adds a 'status' field to m68k thread_info struct, and stores information about whether a syscall trace is in progress, and a full stack frame has been saved, in that field. This information can be used in arch/m68k/kernel/ptrace.c by get/put_reg() to guard against accessing incorrect information on the stack (haven't got around to that bit yet). I'm quite certain I haven't picked the most efficient implementation here - suggestions to optimize most welcome! Cheers, Michael