The quilt patch titled
Subject: hugetlbfs: add MTE support
has been removed from the -mm tree. Its filename was
hugetlbfs-add-mte-support.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
Subject: hugetlbfs: add MTE support
Date: Tue, 25 Jun 2024 16:37:17 -0700
MTE can be supported on ram based filesystem. It is supported on tmpfs.
There is use case to use MTE on hugetlbfs as well, adding MTE support.
Exercising this capability requires special arrangements. This needs
hardware support and custom-patched QEMU. We did in-house testing on
AmpereOne platform with patched QEMU 8.1.
Custom-patched QEMU is not required for a minimum test. But a special
test program is definitely needed. We used custom-patched QEMU to test
VM backed by hugetlbfs with MTE enabled.
Link: https://lkml.kernel.org/r/20240625233717.2769975-1-yang@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/hugetlbfs/inode.c~hugetlbfs-add-mte-support
+++ a/fs/hugetlbfs/inode.c
@@ -110,7 +110,7 @@ static int hugetlbfs_file_mmap(struct fi
* way when do_mmap unwinds (may be important on powerpc
* and ia64).
*/
- vm_flags_set(vma, VM_HUGETLB | VM_DONTEXPAND);
+ vm_flags_set(vma, VM_HUGETLB | VM_DONTEXPAND | VM_MTE_ALLOWED);
vma->vm_ops = &hugetlb_vm_ops;
ret = seal_check_write(info->seals, vma);
_
Patches currently in -mm which might be from yang@xxxxxxxxxxxxxxxxxxxxxx are
mm-page_ref-remove-folio_try_get_rcu.patch
mm-gup-stop-abusing-try_grab_folio.patch
