[PATCH 03/13] mm: convert __get_unmapped_area() to use vma_flags_t
From: Lorenzo Stoakes <ljs@kernel.org>
Date: 2026-06-29 19:26:08
Also in:
dri-devel, intel-gfx, intel-xe, linux-arm-msm, linux-fbdev, linux-fsdevel, linux-mips, linux-mm, linux-samsung-soc, linux-sound, linux-tegra, lkml, nouveau, virtualization, xen-devel
Subsystem:
filesystems (vfs and infrastructure), hugetlb subsystem, memory management, memory management - core, memory management - thp (transparent huge page), memory mapping, the rest · Maintainers:
Alexander Viro, Christian Brauner, Muchun Song, Oscar Salvador, Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Liam R. Howlett, Linus Torvalds
Update __get_unmapped_area() to be parameterised by vma_flags_t rather than vm_flags_t as part of the effort to move VMA flags from a system word to a bitmap. We cascade the changes up to arch_get_unmapped_area_topdown() and arch_get_unmapped_area(), where, for now, we use vma_flags_to_legacy() in order to propagate the VMA flags. No functional change intended. Signed-off-by: Lorenzo Stoakes <ljs@kernel.org> --- fs/hugetlbfs/inode.c | 3 ++- include/linux/huge_mm.h | 10 +++++----- include/linux/mm.h | 6 ++++-- include/linux/sched/mm.h | 12 ++++++------ mm/huge_memory.c | 21 ++++++++++++--------- mm/mmap.c | 27 ++++++++++++++------------- 6 files changed, 43 insertions(+), 36 deletions(-)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 894d02e73302..fe7d5a5d60bd 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c@@ -184,7 +184,8 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, if (addr) addr0 = ALIGN(addr, huge_page_size(h)); - return mm_get_unmapped_area_vmflags(file, addr0, len, pgoff, flags, 0); + return mm_get_unmapped_area_vmaflags(file, addr0, len, pgoff, flags, + EMPTY_VMA_FLAGS); } /*
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 653b81d08fe7..ae84a714907f 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h@@ -391,9 +391,9 @@ static inline bool thp_disabled_by_hw(void) unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); -unsigned long thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr, +unsigned long thp_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, - vm_flags_t vm_flags); + vma_flags_t vma_flags); enum split_type { SPLIT_TYPE_UNIFORM,
@@ -615,9 +615,9 @@ static inline unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma, #define thp_get_unmapped_area NULL static inline unsigned long -thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr, - unsigned long len, unsigned long pgoff, - unsigned long flags, vm_flags_t vm_flags) +thp_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags, vma_flags_t vma_flags) { return 0; }
diff --git a/include/linux/mm.h b/include/linux/mm.h
index cc2a87755adb..474b3698f565 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -4160,13 +4160,15 @@ unsigned long randomize_page(unsigned long start, unsigned long range); unsigned long __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, - unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags); + unsigned long pgoff, unsigned long flags, + vma_flags_t vma_flags); static inline unsigned long get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { - return __get_unmapped_area(file, addr, len, pgoff, flags, 0); + return __get_unmapped_area(file, addr, len, pgoff, flags, + EMPTY_VMA_FLAGS); } unsigned long do_mmap(struct file *file, unsigned long addr,
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 95d0040df584..b301ec90740a 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h@@ -193,12 +193,12 @@ unsigned long mm_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); -unsigned long mm_get_unmapped_area_vmflags(struct file *filp, - unsigned long addr, - unsigned long len, - unsigned long pgoff, - unsigned long flags, - vm_flags_t vm_flags); +unsigned long mm_get_unmapped_area_vmaflags(struct file *filp, + unsigned long addr, + unsigned long len, + unsigned long pgoff, + unsigned long flags, + vma_flags_t vma_flags); unsigned long generic_get_unmapped_area(struct file *filp, unsigned long addr,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e94f56487225..d6c5f51ee399 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c@@ -1196,7 +1196,7 @@ static inline bool is_transparent_hugepage(const struct folio *folio) static unsigned long __thp_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, loff_t off, unsigned long flags, unsigned long size, - vm_flags_t vm_flags) + vma_flags_t vma_flags) { loff_t off_end = off + len; loff_t off_align = round_up(off, size);
@@ -1212,8 +1212,9 @@ static unsigned long __thp_get_unmapped_area(struct file *filp, if (len_pad < len || (off + len_pad) < off) return 0; - ret = mm_get_unmapped_area_vmflags(filp, addr, len_pad, - off >> PAGE_SHIFT, flags, vm_flags); + ret = mm_get_unmapped_area_vmaflags(filp, addr, len_pad, + off >> PAGE_SHIFT, flags, + vma_flags); /* * The failure might be due to length padding. The caller will retry
@@ -1238,25 +1239,27 @@ static unsigned long __thp_get_unmapped_area(struct file *filp, return ret; } -unsigned long thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr, +unsigned long thp_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, - vm_flags_t vm_flags) + vma_flags_t vma_flags) { unsigned long ret; loff_t off = (loff_t)pgoff << PAGE_SHIFT; - ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE, vm_flags); + ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE, + vma_flags); if (ret) return ret; - return mm_get_unmapped_area_vmflags(filp, addr, len, pgoff, flags, - vm_flags); + return mm_get_unmapped_area_vmaflags(filp, addr, len, pgoff, flags, + vma_flags); } unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { - return thp_get_unmapped_area_vmflags(filp, addr, len, pgoff, flags, 0); + return thp_get_unmapped_area_vmaflags(filp, addr, len, pgoff, flags, + EMPTY_VMA_FLAGS); } EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
diff --git a/mm/mmap.c b/mm/mmap.c
index 547352183214..461ce510e12a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -411,8 +411,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, /* Obtain the address to map to. we verify (or select) it and ensure * that it represents a valid section of the address space. */ - addr = __get_unmapped_area(file, addr, len, pgoff, flags, - vma_flags_to_legacy(vma_flags)); + addr = __get_unmapped_area(file, addr, len, pgoff, flags, vma_flags); if (IS_ERR_VALUE(addr)) return addr;
@@ -812,19 +811,20 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, } #endif -unsigned long mm_get_unmapped_area_vmflags(struct file *filp, unsigned long addr, - unsigned long len, unsigned long pgoff, - unsigned long flags, vm_flags_t vm_flags) +unsigned long mm_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags, vma_flags_t vma_flags) { if (mm_flags_test(MMF_TOPDOWN, current->mm)) return arch_get_unmapped_area_topdown(filp, addr, len, pgoff, - flags, vm_flags); - return arch_get_unmapped_area(filp, addr, len, pgoff, flags, vm_flags); + flags, vma_flags_to_legacy(vma_flags)); + return arch_get_unmapped_area(filp, addr, len, pgoff, flags, + vma_flags_to_legacy(vma_flags)); } unsigned long __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, - unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags) + unsigned long pgoff, unsigned long flags, vma_flags_t vma_flags) { unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long)
@@ -859,11 +859,11 @@ __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, && !addr /* no hint */ && IS_ALIGNED(len, PMD_SIZE)) { /* Ensures that larger anonymous mappings are THP aligned. */ - addr = thp_get_unmapped_area_vmflags(file, addr, len, - pgoff, flags, vm_flags); + addr = thp_get_unmapped_area_vmaflags(file, addr, len, + pgoff, flags, vma_flags); } else { - addr = mm_get_unmapped_area_vmflags(file, addr, len, - pgoff, flags, vm_flags); + addr = mm_get_unmapped_area_vmaflags(file, addr, len, + pgoff, flags, vma_flags); } if (IS_ERR_VALUE(addr)) return addr;
@@ -881,7 +881,8 @@ unsigned long mm_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { - return mm_get_unmapped_area_vmflags(file, addr, len, pgoff, flags, 0); + return mm_get_unmapped_area_vmaflags(file, addr, len, pgoff, flags, + EMPTY_VMA_FLAGS); } EXPORT_SYMBOL(mm_get_unmapped_area);
--
2.54.0