+ arm64-hugetlb-drop-the-init_mm-special-case-in-clear_flush.patch added to mm-new branch

+ arm64-hugetlb-drop-the-init_mm-special-case-in-clear_flush.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: arm64/hugetlb: drop the init_mm special case in clear_flush()
has been added to the -mm mm-new branch.  Its filename is
     arm64-hugetlb-drop-the-init_mm-special-case-in-clear_flush.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-hugetlb-drop-the-init_mm-special-case-in-clear_flush.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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and is updated there most days

------------------------------------------------------
From: Wen Jiang <jiangwen6@xiaomi.com>
Subject: arm64/hugetlb: drop the init_mm special case in clear_flush()
Date: Sat, 07 Nov 2026 21:49:47 +0800

clear_flush() calls flush_tlb_kernel_range() when mm is &init_mm. This
was added by commit 06fc959fcff7 ("arm64/mm: Support huge pte-mapped
pages in vmap") because vmap called set_huge_pte_at(&init_mm, ...).

Now that vmap uses vmap_pte_set_huge()/vmap_pte_clear_huge(),
mm/vmalloc.c is no longer a caller of set_huge_pte_at() on arm64. The
only remaining callers passing &init_mm are in arch/powerpc, which uses
its own implementation. Remove the dead branch.

No functional change.

Link: https://lore.kernel.org/20261107134953.748622-5-jiangwenxiaomi@gmail.com
Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: <leo.yan@arm.com>
Cc: Xueyuan Chen <xueyuan.chen21@gmail.com>
Cc: Christophe Leroy <chleroy@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Andrew Donnellan <andrew+kernel@donnellan.id.au>
Cc: Wen Jiang <jiangwenxiaomi@gmail.com>
---

 arch/arm64/mm/hugetlbpage.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/arch/arm64/mm/hugetlbpage.c~arm64-hugetlb-drop-the-init_mm-special-case-in-clear_flush
+++ a/arch/arm64/mm/hugetlbpage.c
@@ -206,10 +206,7 @@ static void clear_flush(struct mm_struct
 	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
 		__ptep_get_and_clear_anysz(mm, addr, ptep, pgsize);
 
-	if (mm == &init_mm)
-		flush_tlb_kernel_range(saddr, addr);
-	else
-		__flush_hugetlb_tlb_range(&vma, saddr, addr, pgsize, TLBF_NOWALKCACHE);
+	__flush_hugetlb_tlb_range(&vma, saddr, addr, pgsize, TLBF_NOWALKCACHE);
 }
 
 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
_

Patches currently in -mm which might be from jiangwen6@xiaomi.com are

arm64-mm-add-vmap_pte_set_huge-and-vmap_pte_clear_huge.patch
powerpc-8xx-add-vmap_pte_set_huge.patch
mm-vmalloc-use-vmap_pte_set_huge-vmap_pte_clear_huge-for-pte-level-block-mappings.patch
arm64-hugetlb-drop-the-init_mm-special-case-in-clear_flush.patch
mm-vmalloc-extract-vmap_set_ptes-to-consolidate-pte-mapping-logic.patch
mm-vmalloc-extract-vm_shift-to-consolidate-mapping-shift-selection.patch