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Fri, 14 Aug 2026 15:18:00 +0000 (GMT) Received: from li-d98989cc-2c66-11b2-a85c-93ab83b7dd53.ehn-de.ibm.com (unknown [9.224.77.173]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Aug 2026 15:18:00 +0000 (GMT) From: Christian Borntraeger To: linux-btrfs@vger.kernel.org, Qu Wenruo Cc: borntraeger@linux.ibm.com, David Sterba , Chris Mason , Josef Bacik , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 1/1] s390x/css: Fix css stsch detection to go beyond 8192 devices Date: Fri, 14 Aug 2026 17:17:59 +0200 Message-ID: <20260814151759.1831153-1-borntraeger@linux.ibm.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=XqfK/1F9 c=1 sm=1 tr=0 ts=6a7f31ab cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=I40c305UB8KqZV4D04UA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE0MDExNCBTYWx0ZWRfXwiSr0Na4S8mj qiYQOfMqi2x3vCzgXbudvZE6LV+/IVKvv/iWXCRBKLf2aXlszuwo03fABtZYVgHvrsRtgHcVqJc hi806stJSSti0xwkPnPL6Ml+563B6oKB/EAkAODpjT0HwjcH2HXG6mWYagcvFzCScb+9iUex08s +JBE6P2cqimbah/glNf147f+ulxniPtDlv4mrE79v/XahOWEDU3bAGnvRcne+26vY2Zdzk8W7J7 MIl+pPjfeMrB/PsmeeE50r8tqEqp2vGFls4/P9PkPFMrbESE6G3dbkMMaQA3u7np7y55+Q4ZzhY +E5DUgBuH5zcJ/wJ7f1qz1yXRviB+BHyl6QXgRD9mmj1Ycrp9P8PowRJbVM4gq4mCxOTjZuDrUt 8KWB2WY85BTzqA8+wnARw+tgJG/8m3a0ocFrprtHOn6WZN6KipcOQoWQFWN5zGTxEmOvust0zT5 ch7vGkFBCkbCOygNcxA== X-Proofpoint-ORIG-GUID: Pf9jo0x16chyHvJn-zhFReGE7dqak_vS X-Proofpoint-GUID: Pf9jo0x16chyHvJn-zhFReGE7dqak_vS X-Proofpoint-Spam-Info: AW1haW4tMjYwODE0MDExNCBTYWx0ZWRfXxuetWXqxsvL8 BQt1OLXDezk5r0ksKODKrGPhj9vtVXB8n+UgUP1T4rpLKxsBvGIT+a0W5sMW6dF0AAw4oBmD+W1 1WtO2RPkxjm7st/LAAyfoMYqbfnLZBU= 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=2026-08-14_05,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 adultscore=0 malwarescore=0 clxscore=1015 suspectscore=0 priorityscore=1501 impostorscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608140114 find_last_bit expects a size in bits and not in words. the calculation limits the number of guest devices to 8192. This probably does not matter in reality, its wrong anyway. Fixes: df1fe5bb49241 ("s390: Virtual channel subsystem support") Signed-off-by: Christian Borntraeger --- hw/s390x/css.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/hw/s390x/css.c b/hw/s390x/css.c index 3a67b670531..dedd39006bf 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -2023,8 +2023,7 @@ bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid) return true; } set = channel_subsys.css[real_cssid]->sch_set[ssid]; - return schid > find_last_bit(set->schids_used, - (MAX_SCHID + 1) / sizeof(unsigned long)); + return schid > find_last_bit(set->schids_used,(MAX_SCHID + 1)); } unsigned int css_find_free_chpid(uint8_t cssid) -- 2.55.0