From patchwork Thu Nov 22 00:28:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 10693331 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0558A15A7 for ; Thu, 22 Nov 2018 00:33:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E608F2866D for ; Thu, 22 Nov 2018 00:33:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D968A28744; Thu, 22 Nov 2018 00:33:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7491F2866D for ; Thu, 22 Nov 2018 00:33:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Subject:To:From :Date:Message-Id:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=Vb0qYmFT44nmTwNxzIpsO/8k9NbJTj1QfDvtkgtioeQ=; b=XzUQxZ8HY38Y2o 4fdqDt1fHfmlJ5wYlRzj3+7uVF/qZEAfzwWNVNh4ecV1lGAdfHbxRe3Ziws7Yjg71abZN+nR1ItQ3 MDa+UNR3wz5zH0b2AoQIjgqP+P2xS+aw4qlbsurTEN2g1boCm4f/rs5Fg9d+5mDbKYMcGGCz4BejR zDplFEZbH7pez1Jgtf0kH7+BTPk6oKUe4TI9CEjNFTPuT8c06PRfkDK+HrBAv7y2KtITsuJqrZhKK NhBlaA1k8c4/L7ngfOJTR6AAFUzahUzRUx356YOfDN3YsQd9Dwfv6uAkEOTU+WUQgwnmYyDyKrUdQ o81lT5gSZy8otf2B9CqA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gPcwG-0002u0-09; Thu, 22 Nov 2018 00:33:48 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gPcwC-0002rX-IN for linux-arm-kernel@lists.infradead.org; Thu, 22 Nov 2018 00:33:46 +0000 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EF88F214C4; Thu, 22 Nov 2018 00:33:32 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.91) (envelope-from ) id 1gPcw0-0004RA-0h; Wed, 21 Nov 2018 19:33:32 -0500 Message-Id: <20181122003331.917870132@goodmis.org> User-Agent: quilt/0.65 Date: Wed, 21 Nov 2018 19:28:05 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Subject: [for-next][PATCH 04/18] arm64: function_graph: Simplify with function_graph_entry() References: <20181122002801.501220343@goodmis.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181121_163344_699150_93A3DF48 X-CRM114-Status: GOOD ( 13.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Peter Zijlstra , Catalin Marinas , Frederic Weisbecker , Will Deacon , stable@kernel.org, Thomas Gleixner , Masami Hiramatsu , Andy Lutomirski , Josh Poimboeuf , Joel Fernandes , Andrew Morton , Linus Torvalds , Ingo Molnar , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Steven Rostedt (VMware)" The function_graph_entry() function does the work of calling the function graph hook function and the management of the shadow stack, simplifying the work done in the architecture dependent prepare_ftrace_return(). Have arm64 use the new code, and remove the shadow stack management as well as having to set up the trace structure. This is needed to prepare for a fix of a design bug on how the curr_ret_stack is used. Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: stable@kernel.org Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") Signed-off-by: Steven Rostedt (VMware) Acked-by: Will Deacon --- arch/arm64/kernel/ftrace.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-) diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c index 50986e388d2b..57e962290df3 100644 --- a/arch/arm64/kernel/ftrace.c +++ b/arch/arm64/kernel/ftrace.c @@ -216,8 +216,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, { unsigned long return_hooker = (unsigned long)&return_to_handler; unsigned long old; - struct ftrace_graph_ent trace; - int err; if (unlikely(atomic_read(¤t->tracing_graph_pause))) return; @@ -229,18 +227,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, */ old = *parent; - trace.func = self_addr; - trace.depth = current->curr_ret_stack + 1; - - /* Only trace if the calling function expects to */ - if (!ftrace_graph_entry(&trace)) - return; - - err = ftrace_push_return_trace(old, self_addr, &trace.depth, - frame_pointer, NULL); - if (err == -EBUSY) - return; - else + if (!function_graph_enter(old, self_addr, frame_pointer, NULL)) *parent = return_hooker; }