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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC1AEC433EF for ; Thu, 21 Apr 2022 10:12:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388231AbiDUKOv (ORCPT ); Thu, 21 Apr 2022 06:14:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39922 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1388138AbiDUKN5 (ORCPT ); Thu, 21 Apr 2022 06:13:57 -0400 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17EBEF6B for ; Thu, 21 Apr 2022 03:11:08 -0700 (PDT) Received: by mail-pf1-x42d.google.com with SMTP id bo5so4573216pfb.4 for ; Thu, 21 Apr 2022 03:11:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=hdnqgvQUKM2bZrGrKVDmt9RrjK+aAWvXbMuv7vTUtfE=; b=cbo5rNoZILL/PF4xvaUy1JfZC8M8NOp0uxlPNB8cgum7YnNXqEeLQMfcFU6K3fCUKz bI79klpOhBfZS9m6xyE/aZbbiUNtunfi4g1i1+FpRJuAIuwAgAsWgq3I7wBuRHCZeRlf 5SdJZ9YI+dzv1DlZzHG2wJVB7Tpd5s7lYZCg0lvze3MH5cnQ+vj3+gg10MIvMDQmGajH hqwFRVhqUvk/eCxvg3xxZUrgy1EeMT95c7zSHVBOUeCSsglXP9yXTM/sj2xrVbV4OAan 98c8/Q3HdNSmHQE6hC+UwmJGKRWWaE7y4yXkLImH7G97LOETjzfv7063gpRCw3GzMfCm RKHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=hdnqgvQUKM2bZrGrKVDmt9RrjK+aAWvXbMuv7vTUtfE=; b=6S8jrZf4CM+i27BVZ4go0ZnfXhWrm+mkxvlTcNtXQXOmmAFGoI9CA3XyEbn479wAuK 2r/7CA3Eq5j9vtwpaBCPE8JEnEqONj+T0iZOd5aVy695rUUMYWlh9dPnhMn2p0/YybuV aGp6SxfI5JWqjBwa3VdiYehnOa1ylyoEH0Bkk/zxwWciCU+rgE/HItTOEIT6smB/RXZ9 sn/hpV+KB7Rs0uDJ6hpDlYW4W2wWmeDWgOoNOMswrRFC59E+YFoabOWcPZtvRjVS7ovu Af/tyDohJJBgj1aQsO3wJ3ugBhi3gXpv43FRkhxFs5URkjoQ2I8KcJIlxIKkzxGs37zW plgg== X-Gm-Message-State: AOAM533o41lEgqs0C7v7Ojaw/dp18nKEIvl0G7hLjCSZGZRQk4/EiAIZ cHOzxrRLFc+p5KBChpuQqy8= X-Google-Smtp-Source: ABdhPJzkJD3TIf9slREdnMuLeJHCgp6CgU05+02Url1Fw+VtyLcJN6X4kVhTTd7i7Xj7SDvObNEzRw== X-Received: by 2002:a63:f147:0:b0:399:2b1f:7aff with SMTP id o7-20020a63f147000000b003992b1f7affmr23531374pgk.341.1650535867681; Thu, 21 Apr 2022 03:11:07 -0700 (PDT) Received: from octofox.hsd1.ca.comcast.net ([2601:641:401:1d20:df13:3d47:8c92:6576]) by smtp.gmail.com with ESMTPSA id w196-20020a6282cd000000b0050ada022940sm2407806pfd.183.2022.04.21.03.11.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Apr 2022 03:11:06 -0700 (PDT) From: Max Filippov To: linux-xtensa@linux-xtensa.org Cc: Chris Zankel , linux-kernel@vger.kernel.org, Max Filippov Subject: [PATCH v2 09/10] xtensa: get rid of stack frame in coprocessor_flush Date: Thu, 21 Apr 2022 03:10:32 -0700 Message-Id: <20220421101033.216394-10-jcmvbkbc@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220421101033.216394-1-jcmvbkbc@gmail.com> References: <20220421101033.216394-1-jcmvbkbc@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org coprocessor_flush is an ordinary function, it can use all registers. Don't reserve stack frame for it and use a7 to preserve a0 around the context saving call. Signed-off-by: Max Filippov --- Changes v1->v2: - new patch arch/xtensa/kernel/coprocessor.S | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/arch/xtensa/kernel/coprocessor.S b/arch/xtensa/kernel/coprocessor.S index af11ddaa8c5f..95412409c49e 100644 --- a/arch/xtensa/kernel/coprocessor.S +++ b/arch/xtensa/kernel/coprocessor.S @@ -216,10 +216,8 @@ ENDPROC(fast_coprocessor) ENTRY(coprocessor_flush) - /* reserve 4 bytes on stack to save a0 */ - abi_entry(4) + abi_entry_default - s32i a0, a1, 0 movi a4, .Lcp_regs_jump_table addx8 a4, a3, a4 addx4 a3, a3, a4 @@ -227,10 +225,11 @@ ENTRY(coprocessor_flush) beqz a4, 1f l32i a3, a3, CP_REGS_TAB_OFFSET add a2, a2, a3 + mov a7, a0 callx0 a4 -1: l32i a0, a1, 0 - - abi_ret(4) + mov a0, a7 +1: + abi_ret_default ENDPROC(coprocessor_flush) -- 2.30.2