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Thu, 1 Oct 2026 10:32:48 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 1 Oct 2026 10:32:48 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Niklas Schnelle , Matthew Rosato , Gerald Schaefer , Vineeth Vijayan , Peter Oberparleiter , Harald Freudenberger , Holger Dengler , Stefan Haberland , Jan Hoeppner , Ilya Leoshkevich , Janosch Frank , Claudio Imbrenda Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 02/32] s390/early: Fix early warning handling Date: Thu, 1 Oct 2026 12:32:17 +0200 Message-ID: <20261001103247.1989111-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261001103247.1989111-1-hca@linux.ibm.com> References: <20261001103247.1989111-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDAxMDA0MCBTYWx0ZWRfX0NJXRI0Rv4oo YJxxXtCbhtNIqI4X3fWoUSuVi13kd3SLA48B9MSU8RZTu/6uWAOq6Wdp3yb9xRCc8GuX5BSUj3s lbQLn1mq1ffMNqNb7PTcnTwK0D2HxSQ= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDAxMDA0MCBTYWx0ZWRfX/beetAuEBpXL bKiavfbCuEZQELXatnkgdR84A541AhF8127VjXn3tMYZLxQKrdXGpaa4+UadBkNxZSmLR/Tp+fB u1g4PvXB+egPCP/P7C8GLUZzMnYIzzwRSd2Nj+iLH9bwz6mJe4BD2szIGmo7w8djHjwNEJK7ZyS J9SOdP3kAStfHalLrqFRzWMI4B7y92+nqPJK4/kUP54FOxuEmap3ukzUcAF0a+2pOJ0DyLS6hzC 2z0+tTQew7j9mPZhtaQvtWOvKDRwREu3bH0sYYPzMkFyKWMlLyE8gp8EP6mSDAs6Fs1kHewOrAk DV19aKOVSZTyuUfg8voREcpsXwZFXHteKA7/Q2s5apnskQLP6xUwODs/xBYYbXQRtiGaOqStoai HgT8UUo7+r5dMdMdddWSXpjXPuK7WsB6NfE1w9CXNGxYiV92UBHT51eyJm57yAPDvxjYzT4ii1U yQY6oej7eR8Q4iFW75g== X-Proofpoint-GUID: tuV6EuP57UDqkx_QQcqWryTu_g0Be44S X-Authority-Analysis: v=2.4 cv=RKcmjIi+ c=1 sm=1 tr=0 ts=6abe36d5 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=VxC_P-UtoQCekwcQ100A:9 X-Proofpoint-ORIG-GUID: tuV6EuP57UDqkx_QQcqWryTu_g0Be44S X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-01_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 spamscore=0 bulkscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610010040 When adding support for __WARN_printf() the early program check handler was not taken into account. Add the missing support to the early program check handler. This avoids that the kernel crashes instead of printing a warning. Fixes: 04dabb4261c3 ("s390/bug: Implement __WARN_printf()") Fixes: 79996065cfa2 ("s390/bug: Skip __WARN_trap() in call traces") Signed-off-by: Heiko Carstens --- arch/s390/kernel/early.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index b27239c03d79..1fc153d8385b 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -153,16 +153,25 @@ static __init void setup_topology(void) void __init __do_early_pgm_check(struct pt_regs *regs) { struct lowcore *lc = get_lowcore(); - unsigned long ip; regs->int_code = lc->pgm_int_code; regs->int_parm_long = lc->trans_exc_code; regs->last_break = lc->pgm_last_break; - ip = __rewind_psw(regs->psw, regs->int_code >> 16); + regs->monitor_code = lc->monitor_code; /* Monitor Event? Might be a warning */ if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) { - if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN) + enum bug_trap_type btt; + unsigned long ip; + + if (regs->monitor_code == MONCODE_BUG_ARG) { + regs->psw.addr = regs->gprs[14]; + btt = report_bug_entry((struct bug_entry *)regs->gprs[2], regs); + } else { + ip = __rewind_psw(regs->psw, regs->int_code >> 16); + btt = report_bug(ip, regs); + } + if (btt == BUG_TRAP_TYPE_WARN) return; } if (fixup_exception(regs)) -- 2.53.0