From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZosmXxIAE4+7BXpRaLJa202AHcyddghSsDyPp7lCxYcNYBUyJB7BDqgx35/TYIoNL0SLJ1k ARC-Seal: i=1; a=rsa-sha256; t=1526937834; cv=none; d=google.com; s=arc-20160816; b=r7D/j4W1X6zzhGdl2I9MCVPf7OdBbX29hYw1xqtvGU26e8oqVGlExGHJvVpduYs8A/ FWwzb0nqdrr334C8lPVJ/A6w3Fq51RuA0jV10/+ddSoINGVT4p0dwnIvBEGRsp+UbjgD JpyNyOjljgR9EjMtC798Wqh8kdV5E1nPkdnCbQ8B3RRV+B/fwajem1McNbKJABdcXmcS hJS5Y1ny+d1SBQyutB2TL2GB55rQSKooq+CHbyT5VVvBYtxId0gUvOqOyiwsTltb+IEi X9hssEAFrwrQuEsDVjJTUaZA7ur8Brp2n5VwwQX4vixq1hHKrJF22DddRDpk4vnaY1GQ K1mw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=6vbqNpEKQ0yPVXtrVySXiBDtLSqMrbLzCr/l31vE3HU=; b=YlnnKJiS0/LcCRHIm1BsuwfhkVwblY5eNzfxYk+15sVie46LdFEYPgX5uRpkxjQfZk aVHNSBOTfxOHgAUtNZIwjPrTKrWAzjddH2PGSeiSIGgIWWvDSWtIHqwFPoUGHMCsfMOp V+MPwDa4zHBwTLsWssVOs1e4Wxezfm46iz/IX4vxj/MnnB1uzqH3lXzTpQbmn+TZHNEi dqVw73KSTMTvD5YriBBrCJFiaU8ISTbq7TPENyDOCVAmLVxRsKMXeMmiTH4+7bFOGMem Q2qIiJ6cRb4WLjbZPV/zm44oUAFhnC0VRPZ3lvM/OPrhYyKUTUVYRgdkd7Jb/plBAOHz vAAQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=QsMmMUBO; spf=pass (google.com: domain of srs0=nia/=ii=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=nia/=II=linuxfoundation.org=gregkh@kernel.org Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=QsMmMUBO; spf=pass (google.com: domain of srs0=nia/=ii=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=nia/=II=linuxfoundation.org=gregkh@kernel.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hendrik Brueckner , Martin Schwidefsky Subject: [PATCH 4.16 043/110] s390: remove indirect branch from do_softirq_own_stack Date: Mon, 21 May 2018 23:11:40 +0200 Message-Id: <20180521210507.918921974@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180521210503.823249477@linuxfoundation.org> References: <20180521210503.823249477@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1601109880764209307?= X-GMAIL-MSGID: =?utf-8?q?1601110366336223503?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Martin Schwidefsky commit 9f18fff63cfd6f559daa1eaae60640372c65f84b upstream. The inline assembly to call __do_softirq on the irq stack uses an indirect branch. This can be replaced with a normal relative branch. Cc: stable@vger.kernel.org # 4.16 Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches") Reviewed-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/irq.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -176,10 +176,9 @@ void do_softirq_own_stack(void) new -= STACK_FRAME_OVERHEAD; ((struct stack_frame *) new)->back_chain = old; asm volatile(" la 15,0(%0)\n" - " basr 14,%2\n" + " brasl 14,__do_softirq\n" " la 15,0(%1)\n" - : : "a" (new), "a" (old), - "a" (__do_softirq) + : : "a" (new), "a" (old) : "0", "1", "2", "3", "4", "5", "14", "cc", "memory" ); } else {