[RFC PATCH 2/8] arch/s390: Teach arch_get_unmapped_area{_topdown} to handle hugetlb mappings

Oscar Salvador
2024-07-10T10:51:31Z

through generic channels, so teach arch_get_unmapped_area{_topdown}
to handle those.
s390 specific hugetlb function does not set info.align_offset, so do
the same here for compatibility.

Signed-off-by: Oscar Salvador <osalvador@suse.de>
---
arch/s390/mm/mmap.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 206756946589..e98c00df586f 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -73,6 +73,8 @@ static inline unsigned long mmap_base(unsigned long rnd,

static int get_align_mask(struct file *filp, unsigned long flags)
{
+ if (filp && is_file_hugepages(filp))
+ return huge_page_mask_align(filp);
if (!(current->flags & PF_RANDOMIZE))
return 0;
if (filp || (flags & MAP_SHARED))
@@ -106,7 +108,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
info.low_limit = mm->mmap_base;
info.high_limit = TASK_SIZE;
info.align_mask = get_align_mask(filp, flags);
- info.align_offset = pgoff << PAGE_SHIFT;
+ if (!(file && is_file_hugepages(filp))
+ info.align_offset = pgoff << PAGE_SHIFT;
addr = vm_unmapped_area(&info);
if (offset_in_page(addr))
return addr;
@@ -144,7 +147,8 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad
info.low_limit = PAGE_SIZE;
info.high_limit = mm->mmap_base;
info.align_mask = get_align_mask(filp, flags);
- info.align_offset = pgoff << PAGE_SHIFT;
+ if (!(file && is_file_hugepages(filp))
+ info.align_offset = pgoff << PAGE_SHIFT;
addr = vm_unmapped_area(&info);

/*
--
2.45.2