* Yajun Deng <yajun.deng@xxxxxxxxx> [240110 21:15]:
> There is a lot of code needs to set the range of vma, introduce
> vma_range_init() to initialize the range of vma.
>
> Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx>
> ---
> include/linux/mm.h | 9 +++++++++
> mm/mmap.c | 29 +++++++----------------------
> 2 files changed, 16 insertions(+), 22 deletions(-)
This isn't a whole lot of code, are there others? We're losing code
clarity in favour of saving 6 lines?
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index f5a97dec5169..abb4534be3cc 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3516,6 +3516,15 @@ static inline bool range_in_vma(struct vm_area_struct *vma,
> return (vma && vma->vm_start <= start && end <= vma->vm_end);
> }
>
> +static inline void vma_range_init(struct vm_area_struct *vma,
Any reason this can't be in mm/internal.h ?
vma_range_set(), vma_set_range(), or just vma_range() might be a better
name? My thinking is that some of these are actually modifying the vma
and not just initializing it, right?
> + unsigned long start, unsigned long end,
> + pgoff_t pgoff)
> +{
> + vma->vm_start = start;
> + vma->vm_end = end;
> + vma->vm_pgoff = pgoff;
> +}
> +
> #ifdef CONFIG_MMU
> pgprot_t vm_get_page_prot(unsigned long vm_flags);
> void vma_set_page_prot(struct vm_area_struct *vma);
> diff --git a/mm/mmap.c b/mm/mmap.c
> index 06f1f3e88598..0d3f4612d001 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -663,9 +663,7 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
>
> vma_prepare(&vp);
> vma_adjust_trans_huge(vma, start, end, 0);
> - vma->vm_start = start;
> - vma->vm_end = end;
> - vma->vm_pgoff = pgoff;
> + vma_range_init(vma, start, end, pgoff);
> vma_iter_store(vmi, vma);
>
> vma_complete(&vp, vmi, vma->vm_mm);
> @@ -708,9 +706,7 @@ int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
> vma_adjust_trans_huge(vma, start, end, 0);
>
> vma_iter_clear(vmi);
> - vma->vm_start = start;
> - vma->vm_end = end;
> - vma->vm_pgoff = pgoff;
> + vma_range_init(vma, start, end, pgoff);
> vma_complete(&vp, vmi, vma->vm_mm);
> return 0;
> }
> @@ -1015,10 +1011,7 @@ static struct vm_area_struct
>
> vma_prepare(&vp);
> vma_adjust_trans_huge(vma, vma_start, vma_end, adj_start);
> -
> - vma->vm_start = vma_start;
> - vma->vm_end = vma_end;
> - vma->vm_pgoff = vma_pgoff;
> + vma_range_init(vma, vma_start, vma_end, vma_pgoff);
>
> if (vma_expanded)
> vma_iter_store(vmi, vma);
> @@ -2811,11 +2804,9 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
> }
>
> vma_iter_config(&vmi, addr, end);
> - vma->vm_start = addr;
> - vma->vm_end = end;
> + vma_range_init(vma, addr, end, pgoff);
> vm_flags_init(vma, vm_flags);
> vma->vm_page_prot = vm_get_page_prot(vm_flags);
> - vma->vm_pgoff = pgoff;
>
> if (file) {
> vma->vm_file = get_file(file);
> @@ -3165,9 +3156,7 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma,
> goto unacct_fail;
>
> vma_set_anonymous(vma);
> - vma->vm_start = addr;
> - vma->vm_end = addr + len;
> - vma->vm_pgoff = addr >> PAGE_SHIFT;
> + vma_range_init(vma, addr, addr + len, addr >> PAGE_SHIFT);
> vm_flags_init(vma, flags);
> vma->vm_page_prot = vm_get_page_prot(flags);
> vma_start_write(vma);
> @@ -3404,9 +3393,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
> new_vma = vm_area_dup(vma);
> if (!new_vma)
> goto out;
> - new_vma->vm_start = addr;
> - new_vma->vm_end = addr + len;
> - new_vma->vm_pgoff = pgoff;
> + vma_range_init(new_vma, addr, addr + len, pgoff);
> if (vma_dup_policy(vma, new_vma))
> goto out_free_vma;
> if (anon_vma_clone(new_vma, vma))
> @@ -3574,9 +3561,7 @@ static struct vm_area_struct *__install_special_mapping(
> if (unlikely(vma == NULL))
> return ERR_PTR(-ENOMEM);
>
> - vma->vm_start = addr;
> - vma->vm_end = addr + len;
> -
> + vma_range_init(vma, addr, addr + len, 0);
> vm_flags_init(vma, (vm_flags | mm->def_flags |
> VM_DONTEXPAND | VM_SOFTDIRTY) & ~VM_LOCKED_MASK);
> vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
> --
> 2.25.1
>
>
