+ arch-powerpc-teach-book3s64-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch added to mm-unstable branch

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

The patch titled
     Subject: arch/powerpc: teach book3s64 arch_get_unmapped_area{_topdown} to handle hugetlb mappings
has been added to the -mm mm-unstable branch.  Its filename is
     arch-powerpc-teach-book3s64-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arch-powerpc-teach-book3s64-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch

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

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------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: arch/powerpc: teach book3s64 arch_get_unmapped_area{_topdown} to handle hugetlb mappings
Date: Mon, 29 Jul 2024 11:10:14 +0200

We want to stop special casing hugetlb mappings and make them go through
generic channels, so teach arch_get_unmapped_area{_topdown} to handle
those.

Reshuffle file_to_psize() definition so arch_get_unmapped_area{_topdown}
can make use of it.

Link: https://lkml.kernel.org/r/20240729091018.2152-6-osalvador@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Donet Tom <donettom@xxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/powerpc/mm/book3s64/slice.c |   39 +++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 10 deletions(-)

--- a/arch/powerpc/mm/book3s64/slice.c~arch-powerpc-teach-book3s64-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings
+++ a/arch/powerpc/mm/book3s64/slice.c
@@ -633,17 +633,36 @@ return_addr:
 }
 EXPORT_SYMBOL_GPL(slice_get_unmapped_area);
 
+#ifdef CONFIG_HUGETLB_PAGE
+static int file_to_psize(struct file *file)
+{
+	struct hstate *hstate = hstate_file(file);
+	return shift_to_mmu_psize(huge_page_shift(hstate));
+}
+#else
+static int file_to_psize(struct file *file)
+{
+	return 0;
+}
+#endif
+
 unsigned long arch_get_unmapped_area(struct file *filp,
 				     unsigned long addr,
 				     unsigned long len,
 				     unsigned long pgoff,
 				     unsigned long flags)
 {
+	unsigned int psize;
+
 	if (radix_enabled())
 		return generic_get_unmapped_area(filp, addr, len, pgoff, flags);
 
-	return slice_get_unmapped_area(addr, len, flags,
-				       mm_ctx_user_psize(&current->mm->context), 0);
+	if (filp && is_file_hugepages(filp))
+		psize = file_to_psize(filp);
+	else
+		psize = mm_ctx_user_psize(&current->mm->context);
+
+	return slice_get_unmapped_area(addr, len, flags, psize, 0);
 }
 
 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
@@ -652,11 +671,17 @@ unsigned long arch_get_unmapped_area_top
 					     const unsigned long pgoff,
 					     const unsigned long flags)
 {
+	unsigned int psize;
+
 	if (radix_enabled())
 		return generic_get_unmapped_area_topdown(filp, addr0, len, pgoff, flags);
 
-	return slice_get_unmapped_area(addr0, len, flags,
-				       mm_ctx_user_psize(&current->mm->context), 1);
+	if (filp && is_file_hugepages(filp))
+		psize = file_to_psize(filp);
+	else
+		psize = mm_ctx_user_psize(&current->mm->context);
+
+	return slice_get_unmapped_area(addr0, len, flags, psize, 1);
 }
 
 unsigned int notrace get_slice_psize(struct mm_struct *mm, unsigned long addr)
@@ -787,12 +812,6 @@ unsigned long vma_mmu_pagesize(struct vm
 	return 1UL << mmu_psize_to_shift(get_slice_psize(vma->vm_mm, vma->vm_start));
 }
 
-static int file_to_psize(struct file *file)
-{
-	struct hstate *hstate = hstate_file(file);
-	return shift_to_mmu_psize(huge_page_shift(hstate));
-}
-
 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 					unsigned long len, unsigned long pgoff,
 					unsigned long flags)
_

Patches currently in -mm which might be from osalvador@xxxxxxx are

mm-mmap-teach-generic_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch
arch-s390-teach-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch
arch-x86-teach-arch_get_unmapped_area_vmflags-to-handle-hugetlb-mappings.patch
arch-sparc-teach-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch
arch-powerpc-teach-book3s64-arch_get_unmapped_area_topdown-to-handle-hugetlb-mappings.patch
mm-make-hugetlb-mappings-go-through-mm_get_unmapped_area_vmflags.patch
mm-drop-hugetlb_get_unmapped_area_-functions.patch
arch-s390-clean-up-hugetlb-definitions.patch
mm-consolidate-common-checks-in-hugetlb_mmap_check_and_align.patch