From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFA3E2D94A9 for ; Wed, 21 Jan 2026 03:26:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768966013; cv=none; b=Nmj4OTEfs8IvEG2rL922DqKTZovD4Sa6P8FgjPjHLUv+e8Q93rSZHOm59snVlODYogFljn1YDxS0mtBG6bqEKuVKZrvTIVrjvRQtcpxn3rHy9TayPs2Ls4xspILZrO7rTNW4rsn2on5JEDwSqYq6zUY0HhYC/0gL7E7soq1yxek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768966013; c=relaxed/simple; bh=GEvTMnCM5azSNWSGRwQEBBNCcTcs6maJ8qJHgogUWLs=; h=Date:To:From:Subject:Message-Id; b=Z0Gyx9c54F2digLWRdeAtuBBmXmF0SAueJsKcUfyqYssit5qcBVdwCoJnTBSiRqqcNqVKqpBvQWq5mU+tVf/ynKq9Wrw2s9TMcIizgoheM6X8O9VT+u2zjvUHQGI3mFNUf/e1yG3MKcBhkuJ4AI94oxoWKUc4VCaXxSQfPEjs3s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=0w7pwTEj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="0w7pwTEj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4CE6EC16AAE; Wed, 21 Jan 2026 03:26:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1768966013; bh=GEvTMnCM5azSNWSGRwQEBBNCcTcs6maJ8qJHgogUWLs=; h=Date:To:From:Subject:From; b=0w7pwTEjL/ekXL8WEi0pPdfPibZAsHHpPDeKy+LHxfH4nsKzKZ8WGvr6UhntqXZnH rJF4GhdPfYqtKLBofoBIvvucr+o6siu3byF1v7OCe/HqbF647BKb2wkxUcAB8AhJ1S 1WOI54+XtFbWLOEmB7jMv+yFsONX4i4pYccizaOY= Date: Tue, 20 Jan 2026 19:26:52 -0800 To: mm-commits@vger.kernel.org,yeoreum.yun@arm.com,will@kernel.org,venkat88@linux.ibm.com,vbabka@suse.cz,tglx@linutronix.de,surenb@google.com,ryan.roberts@arm.com,rppt@kernel.org,ritesh.list@gmail.com,peterz@infradead.org,npiggin@gmail.com,mpe@ellerman.id.au,mingo@redhat.com,mhocko@suse.com,maddy@linux.ibm.com,lorenzo.stoakes@oracle.com,liam.howlett@oracle.com,jgross@suse.com,jannh@google.com,hpa@zytor.com,dwmw2@infradead.org,david@redhat.com,david@kernel.org,davem@davemloft.net,christophe.leroy@csgroup.eu,catalin.marinas@arm.com,bp@alien8.de,boris.ostrovsky@oracle.com,anshuman.khandual@arm.com,andreas@gaisler.com,agordeev@linux.ibm.com,kevin.brodsky@arm.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] x86-xen-use-lazy_mmu_state-when-context-switching.patch removed from -mm tree Message-Id: <20260121032653.4CE6EC16AAE@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: x86/xen: use lazy_mmu_state when context-switching has been removed from the -mm tree. Its filename was x86-xen-use-lazy_mmu_state-when-context-switching.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Kevin Brodsky Subject: x86/xen: use lazy_mmu_state when context-switching Date: Mon, 15 Dec 2025 15:03:22 +0000 We currently set a TIF flag when scheduling out a task that is in lazy MMU mode, in order to restore it when the task is scheduled again. The generic lazy_mmu layer now tracks whether a task is in lazy MMU mode in task_struct::lazy_mmu_state. We can therefore check that state when switching to the new task, instead of using a separate TIF flag. Link: https://lkml.kernel.org/r/20251215150323.2218608-14-kevin.brodsky@arm.com Signed-off-by: Kevin Brodsky Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Juergen Gross Reviewed-by: Yeoreum Yun Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Anshuman Khandual Cc: Borislav Betkov Cc: Boris Ostrovsky Cc: Catalin Marinas Cc: Christophe Leroy Cc: David Hildenbrand Cc: David S. Miller Cc: David Woodhouse Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Jann Horn Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Michal Hocko Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Peter Zijlstra Cc: Ritesh Harjani (IBM) Cc: Ryan Roberts Cc: Suren Baghdasaryan Cc: Thomas Gleinxer Cc: Venkat Rao Bagalkote Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton --- arch/x86/include/asm/thread_info.h | 4 +--- arch/x86/xen/enlighten_pv.c | 3 +-- 2 files changed, 2 insertions(+), 5 deletions(-) --- a/arch/x86/include/asm/thread_info.h~x86-xen-use-lazy_mmu_state-when-context-switching +++ a/arch/x86/include/asm/thread_info.h @@ -100,8 +100,7 @@ struct thread_info { #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ #define TIF_SINGLESTEP 25 /* reenable singlestep on user return*/ #define TIF_BLOCKSTEP 26 /* set when we want DEBUGCTLMSR_BTF */ -#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */ -#define TIF_ADDR32 28 /* 32-bit address space on 64 bits */ +#define TIF_ADDR32 27 /* 32-bit address space on 64 bits */ #define _TIF_SSBD BIT(TIF_SSBD) #define _TIF_SPEC_IB BIT(TIF_SPEC_IB) @@ -114,7 +113,6 @@ struct thread_info { #define _TIF_FORCED_TF BIT(TIF_FORCED_TF) #define _TIF_BLOCKSTEP BIT(TIF_BLOCKSTEP) #define _TIF_SINGLESTEP BIT(TIF_SINGLESTEP) -#define _TIF_LAZY_MMU_UPDATES BIT(TIF_LAZY_MMU_UPDATES) #define _TIF_ADDR32 BIT(TIF_ADDR32) /* flags to check in __switch_to() */ --- a/arch/x86/xen/enlighten_pv.c~x86-xen-use-lazy_mmu_state-when-context-switching +++ a/arch/x86/xen/enlighten_pv.c @@ -426,7 +426,6 @@ static void xen_start_context_switch(str if (this_cpu_read(xen_lazy_mode) == XEN_LAZY_MMU) { arch_leave_lazy_mmu_mode(); - set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES); } enter_lazy(XEN_LAZY_CPU); } @@ -437,7 +436,7 @@ static void xen_end_context_switch(struc xen_mc_flush(); leave_lazy(XEN_LAZY_CPU); - if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES)) + if (__task_lazy_mmu_mode_active(next)) arch_enter_lazy_mmu_mode(); } _ Patches currently in -mm which might be from kevin.brodsky@arm.com are selftests-mm-default-kdir-to-build-directory.patch selftests-mm-remove-flaky-header-check.patch selftests-mm-pass-down-full-cc-and-cflags-to-check_configsh.patch selftests-mm-fix-usage-of-force_read-in-cow-tests.patch selftests-mm-introduce-helper-to-read-every-page-in-range.patch selftests-mm-fix-faulting-in-code-in-pagemap_ioctl-test.patch selftests-mm-fix-exit-code-in-pagemap_ioctl.patch selftests-mm-report-skip-in-pfnmap-if-a-check-fails.patch