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Thu, 12 Jun 2025 17:36:14 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4C36F20043; Thu, 12 Jun 2025 17:36:14 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3887420040; Thu, 12 Jun 2025 17:36:14 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav07.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 A94ADE19DB; 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 6/6] powerpc/64s: Do not re-activate batched TLB flush Date: Thu, 12 Jun 2025 19:36:13 +0200 Message-ID: <8625a1d97dcf4ae499b4bb341e27346f768a7248.1749747752.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-Proofpoint-ORIG-GUID: vQTY3M8ZzSt0cV8-T9uSmi-uBIYEQ6jo X-Proofpoint-GUID: ilIcPrMxf5Pvcy-DGizNo5pQfOED9ogK X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjEyMDEzMiBTYWx0ZWRfX4hJe95qNcCfd ZiGA4V6bFSTahSxOdWra2ve+MTIch6VbUpSLy9/ie7s8Ie297H4KM++vXLqMaovxILSX/VEH7Wd kL8MyHFoqx96u5mOCGyBdQBufIfHdynh/CGelm35zApCFLN5oxqqgVJ1arMbCxOEKkamxhCcQye T4p0jaYnpDgiPAOCiq39P+LTkqDP2vbt+LMS1z2CvkzZGQexAIAmpDiNPfHVf+G1uXLcXOE6U5i OsZ7V6mTRdR0DBm/QtbuD0iTOQBU5jFIaSMQMFqtSBv6tG54QRa2g6Dp1oUK3GV/GQFz/SGEskt ZXn/w51Xb8tzMBLP0YYYHDaeDFEkaV4fsqRoFnw2dboBfFVZA1+J+xjRcI4OfWbgbBcpVESfnm6 /7oQbflnv5Pj4LYSf4VrIQyml0ZufqpOCdiLtdZRi1M7LkYKIRyWGlH1NBkJIEu9ljeGJpAm X-Authority-Analysis: v=2.4 cv=CfMI5Krl c=1 sm=1 tr=0 ts=684b1012 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=6IFa9wvqVegA:10 a=VnNF1IyMAAAA:8 a=OhCMzGPqdLFamtb4m9QA:9 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 bulkscore=0 spamscore=0 phishscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 mlxscore=0 suspectscore=0 mlxlogscore=477 adultscore=0 malwarescore=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-Stat-Signature: iogycuayuwi4kpatswucwyuwoy3snfpa X-Rspamd-Queue-Id: C4B8680007 X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1749749782-969973 X-HE-Meta: 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 GHavqqHu hBmKQQg9SbRnxv7kyYGQrq/kKOscdTY3LwPLld1FNDMUpQh7O4nUUE/x6Q7EifRKchm5Z07NFznZcGIOpnEHVfLPngDimkR5pOo4EigOsjSBYBbSg9lQZvvEx2iFmLipJDjN3388boYuXm7lMZ22X6ysuqLIL6jaea8PWC6X3kzCfaPgaURCe4FsHw90wia1lzg2cvEhbcF/sgqM= 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: Since commit b9ef323ea168 ("powerpc/64s: Disable preemption in hash lazy mmu mode") a task can not be preempted while in lazy MMU mode. Therefore, the batch re-activation code is never called, so remove it. Signed-off-by: Alexander Gordeev --- arch/powerpc/include/asm/thread_info.h | 2 -- arch/powerpc/kernel/process.c | 25 ------------------------- 2 files changed, 27 deletions(-) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 2785c7462ebf..092118a68862 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -154,12 +154,10 @@ void arch_setup_new_exec(void); /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ -#define TLF_LAZY_MMU 3 /* tlb_batch is active */ #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ #define _TLF_NAPPING (1 << TLF_NAPPING) #define _TLF_SLEEPING (1 << TLF_SLEEPING) -#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) #ifndef __ASSEMBLY__ diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 855e09886503..edb59a447149 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1281,9 +1281,6 @@ struct task_struct *__switch_to(struct task_struct *prev, { struct thread_struct *new_thread, *old_thread; struct task_struct *last; -#ifdef CONFIG_PPC_64S_HASH_MMU - struct ppc64_tlb_batch *batch; -#endif new_thread = &new->thread; old_thread = ¤t->thread; @@ -1291,14 +1288,6 @@ struct task_struct *__switch_to(struct task_struct *prev, WARN_ON(!irqs_disabled()); #ifdef CONFIG_PPC_64S_HASH_MMU - batch = this_cpu_ptr(&ppc64_tlb_batch); - if (batch->active) { - current_thread_info()->local_flags |= _TLF_LAZY_MMU; - if (batch->index) - __flush_tlb_pending(batch); - batch->active = 0; - } - /* * On POWER9 the copy-paste buffer can only paste into * foreign real addresses, so unprivileged processes can not @@ -1369,20 +1358,6 @@ struct task_struct *__switch_to(struct task_struct *prev, */ #ifdef CONFIG_PPC_BOOK3S_64 -#ifdef CONFIG_PPC_64S_HASH_MMU - /* - * This applies to a process that was context switched while inside - * arch_enter_lazy_mmu_mode(), to re-activate the batch that was - * deactivated above, before _switch(). This will never be the case - * for new tasks. - */ - if (current_thread_info()->local_flags & _TLF_LAZY_MMU) { - current_thread_info()->local_flags &= ~_TLF_LAZY_MMU; - batch = this_cpu_ptr(&ppc64_tlb_batch); - batch->active = 1; - } -#endif - /* * Math facilities are masked out of the child MSR in copy_thread. * A new task does not need to restore_math because it will -- 2.48.1