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Mon, 12 Oct 2026 14:38:43 +0000 (GMT) Received: from [0.0.0.0] (unknown [9.87.157.242]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 12 Oct 2026 14:38:43 +0000 (GMT) Message-ID: <3ef28ef7-8e21-49e3-bf2b-1af565eea322@linux.ibm.com> Date: Mon, 12 Oct 2026 16:38:43 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 31/32] s390/bpf: Simplify exception table entry handling To: Heiko Carstens , 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 , Janosch Frank , Claudio Imbrenda Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org References: <20261001103247.1989111-1-hca@linux.ibm.com> <20261001103247.1989111-32-hca@linux.ibm.com> Content-Language: en-US From: Ilya Leoshkevich In-Reply-To: <20261001103247.1989111-32-hca@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Cr0q4X4D c=1 sm=1 tr=0 ts=6accf0f8 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=UUIsaXF86_hs-IoztpQA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: WChPWQPQkLrBQ_kitt9RTZbtLKdOiqmA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA1NiBTYWx0ZWRfX1MR7/0ksHPQf gJcglCeh3sUS07wS9NO9MbWL7tzxc0rduVp2low3Ez9AGMvIuIToem5ROguDHKYSWtzFh9jPdVm d0ijaygJW1xTuaWQxpdxn1Vklk9GqA84LOUGq0IEnW+fBJMaiRobOu3lqcVZS3607VJC1cRTaKQ 1fBspj/s7AKiy6/WuU+gg4DnLwRFqWojlJsV3i7l+qZcLx3fI/sB1hlFoWsh3txKgHTFEfp482t K5lmHWhk2kSRlkCk4ud9/6hB2Ys1lN0O1za7KMZLZmaCyHCnTWWS720zt6x8cR7w76jXCTOVPVy 5b9zN5ezjIeBvrwtYFR2wsD/HCurGJs4PGjL71LpPJ3/ONSi/+RhrAqs57NBcrKpLzUYnFkJSEW MangxUYiyhF1/A6bWgxNlGVB0ahi7LWK7kbsQ8GwBgMp8HfySpgtKK9uq7zkFX4CuRbput9gDoV Px+/qcGfMVWMZMaXo2w== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA1NiBTYWx0ZWRfX7oKdmn9cbSU4 0P2DFtCtdifzVGoBvCe5snpCt66LIMjhWvBM58ojgQ20+a/4UZEKdT+y+UN7NvgyFVo3EJ03Yhp 9OJhydAtwXdY3Xq1Fh/Owjjz6GZ8b+4= X-Proofpoint-ORIG-GUID: WChPWQPQkLrBQ_kitt9RTZbtLKdOiqmA 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=2026-10-12_04,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120056 On 10/1/26 12:32, Heiko Carstens wrote: > With exception table lookup always pointing to the faulting instruction, > only a single exception table entry per probe instruction is needed. > > Remove the second exception table entry, the extra nop instruction > emitted between/after probe instructions, and simplify probe handling > in the BPF JIT. > > Signed-off-by: Heiko Carstens > --- > arch/s390/net/bpf_jit_comp.c | 78 ++++++++++-------------------------- > 1 file changed, 21 insertions(+), 57 deletions(-) Reviewed-by: Ilya Leoshkevich