AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

userfaultfd: wrap the common dst_vma check into an inlined function

Browse Source 
When doing UFFDIO_COPY, it is necessary to find the correct destination
vma and make sure fault range is in it.

Since there are two places need to do the same task, just wrap those
common check into an inlined function.

Link: http://lkml.kernel.org/r/20190927070032.2129-3-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2019-11-30 17:57:55 -08:00 committed by Linus Torvalds
parent 53eaa14b62
commit 643aa36ead
1 changed files with 32 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
mm/userfaultfd.c
View File

@ -18,6 +18,36 @@
#include <asm/tlbflush.h>
#include "internal.h"
static __always_inline
struct vm_area_struct *find_dst_vma(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long len)
{
/*
* Make sure that the dst range is both valid and fully within a
* single existing vma.
*/
struct vm_area_struct *dst_vma;
dst_vma = find_vma(dst_mm, dst_start);
if (!dst_vma)
return NULL;
if (dst_start < dst_vma->vm_start ||
dst_start + len > dst_vma->vm_end)
return NULL;
/*
* Check the vma is registered in uffd, this is required to
* enforce the VM_MAYWRITE check done at uffd registration
* time.
*/
if (!dst_vma->vm_userfaultfd_ctx.ctx)
return NULL;
return dst_vma;
}
static int mcopy_atomic_pte(struct mm_struct *dst_mm,
pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
@ -220,20 +250,9 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
*/
if (!dst_vma) {
err = -ENOENT;
dst_vma = find_vma(dst_mm, dst_start);
dst_vma = find_dst_vma(dst_mm, dst_start, len);
if (!dst_vma || !is_vm_hugetlb_page(dst_vma))
goto out_unlock;
/*
* Check the vma is registered in uffd, this is
* required to enforce the VM_MAYWRITE check done at
* uffd registration time.
*/
if (!dst_vma->vm_userfaultfd_ctx.ctx)
goto out_unlock;
if (dst_start < dst_vma->vm_start ||
dst_start + len > dst_vma->vm_end)
goto out_unlock;
err = -EINVAL;
if (vma_hpagesize != vma_kernel_pagesize(dst_vma))
@ -468,20 +487,9 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
* both valid and fully within a single existing vma.
*/
err = -ENOENT;
dst_vma = find_vma(dst_mm, dst_start);
dst_vma = find_dst_vma(dst_mm, dst_start, len);
if (!dst_vma)
goto out_unlock;
/*
* Check the vma is registered in uffd, this is required to
* enforce the VM_MAYWRITE check done at uffd registration
* time.
*/
if (!dst_vma->vm_userfaultfd_ctx.ctx)
goto out_unlock;
if (dst_start < dst_vma->vm_start ||
dst_start + len > dst_vma->vm_end)
goto out_unlock;
err = -EINVAL;
/*