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Thu, 12 Jun 2025 17:36:14 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 45F9520043; Thu, 12 Jun 2025 17:36:14 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 31BD320040; Thu, 12 Jun 2025 17:36:14 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTPS; Thu, 12 Jun 2025 17:36:14 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55669) id A6F65E19CF; Thu, 12 Jun 2025 19:36:13 +0200 (CEST) From: Alexander Gordeev To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Hugh Dickins , Nicholas Piggin , Guenter Roeck , Juergen Gross , Jeremy Fitzhardinge , Ryan Roberts Subject: [PATCH 5/6] powerpc/64s: Do not disable preemption in lazy MMU mode Date: Thu, 12 Jun 2025 19:36:12 +0200 Message-ID: <448f6e26a9d72fb2c873245ea948807491f6b798.1749747752.git.agordeev@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Pfr/hjhd c=1 sm=1 tr=0 ts=684b1011 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=6IFa9wvqVegA:10 a=VnNF1IyMAAAA:8 a=Nsn6zn2YLSyj-wdhBosA:9 X-Proofpoint-GUID: Y7JL08S83tcOGpHgHyKOLNsFJBfulgi4 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjEyMDEzMiBTYWx0ZWRfXxvLPCGltFBs6 pER1hH7Vt06TbX8owkaLIhYurkg/bfiZiDeVHa0PPT4UG5RzmpaRyaYzy4ZzCd+x8pHRBQxHNsW LlMM92svD1VKZhMAfFH8HhjxN6kzFIktURb71PQI+3H4WVjFhd6e0GNz+MKZ65cpAblc41X74IX VWf/EXsyOP+k9EtZQhTtCLK0y9XnX1bfZybbHwQJ+iYyzR+cu2qDSo2vTQjKBcaqzXtO6QCws/G ahxfH8pkJ/OernQEEfBz8Qu/RAndqb3+4jUDYJorjlTofk/Ag29ituHGNj7JG2D1/13Yq1Xceww QO2NYvvcSi2BXvJvwSvBOgqw+ea0ndyQmYpre/Tbc4lnWu8mCsCWILjWTkHUy9oPg7cQuigdRwF pFY0gzFF6leNeCu5EA1j0z0C62x0JAJFBWJjNW0G83T1t2FdFvdOnFeb4KXHaR+HM9fW5qE1 X-Proofpoint-ORIG-GUID: ES5ST5n3tkdVQkhjd27yAL3iJS4bjEER X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-12_10,2025-06-12_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 adultscore=0 clxscore=1015 phishscore=0 bulkscore=0 malwarescore=0 mlxlogscore=654 mlxscore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506120132 X-Rspamd-Queue-Id: 747DD14000A X-Rspamd-Server: rspam07 X-Stat-Signature: 77hymabjf4utf6yet8gu4gt8jzjw9q7m X-Rspam-User: X-HE-Tag: 1749749782-93836 X-HE-Meta: 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 j8lS4mZC yt/0WAlgKyYuqxYTYccMhO9kvT88Y5AvEbC+oIpOle/3SoZsuTq8iMdkliDMOQ+9qi1Sp5Nru7JL7q8ukSNphX7E9aemtQ/+ympnu8uQALif6JTirfiYN3UhfWOkphTMH4oYN8dJMSeXhSw0pWF6dm62pJLfHhElGTJDuYTdd2033pKyc9Zo6D6/DF662u39puJSXErIYMT122OY9yX8DuS1MHts+dltrH5uXqImHgy3HsDPp8KDYaIhnjnAjxbi0BmBCNjJsT8Gi2QLNRmoXfGdmmlbacmeYQ0Cx5MqL5piVrzA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Commit b9ef323ea168 ("powerpc/64s: Disable preemption in hash lazy mmu mode") is not necessary anymore, since the lazy MMU mode is entered with a spinlock held and powerpc does not support Real-Time. Thus, upon entering the lazy mode the preemption is already disabled. Signed-off-by: Alexander Gordeev --- arch/powerpc/include/asm/book3s/64/tlbflush-hash.h | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h index 146287d9580f..aeac22b576c8 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h @@ -30,13 +30,9 @@ static inline void arch_enter_lazy_mmu_mode(void) { struct ppc64_tlb_batch *batch; + VM_WARN_ON_ONCE(preemptible()); if (radix_enabled()) return; - /* - * apply_to_page_range can call us this preempt enabled when - * operating on kernel page tables. - */ - preempt_disable(); batch = this_cpu_ptr(&ppc64_tlb_batch); batch->active = 1; } @@ -45,6 +41,7 @@ static inline void arch_leave_lazy_mmu_mode(void) { struct ppc64_tlb_batch *batch; + VM_WARN_ON_ONCE(preemptible()); if (radix_enabled()) return; batch = this_cpu_ptr(&ppc64_tlb_batch); @@ -52,10 +49,12 @@ static inline void arch_leave_lazy_mmu_mode(void) if (batch->index) __flush_tlb_pending(batch); batch->active = 0; - preempt_enable(); } -#define arch_flush_lazy_mmu_mode() do {} while (0) +static inline void arch_flush_lazy_mmu_mode(void) +{ + VM_WARN_ON_ONCE(preemptible()); +} extern void hash__tlbiel_all(unsigned int action); -- 2.48.1