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authorChristoph Hellwig <hch@lst.de>2019-06-03 09:55:13 +0300
committerChristoph Hellwig <hch@lst.de>2019-09-04 12:13:19 +0300
commitfe9041c245196c6c61091ccc2c74b73ab9a5fc50 (patch)
tree0af220ef01c93e8f1fc70e2681acdb7b204445df /mm/vmalloc.c
parent249baa54790171438524ba97e8e0485dd6aa2762 (diff)
downloadlinux-fe9041c245196c6c61091ccc2c74b73ab9a5fc50.tar.xz
vmalloc: lift the arm flag for coherent mappings to common code
The arm architecture had a VM_ARM_DMA_CONSISTENT flag to mark DMA coherent remapping for a while. Lift this flag to common code so that we can use it generically. We also check it in the only place VM_USERMAP is directly check so that we can entirely replace that flag as well (although I'm not even sure why we'd want to allow remapping DMA appings, but I'd rather not change behavior). Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7ba11e12a11f..c1246d77cf75 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2993,7 +2993,7 @@ int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr,
if (!area)
return -EINVAL;
- if (!(area->flags & VM_USERMAP))
+ if (!(area->flags & (VM_USERMAP | VM_DMA_COHERENT)))
return -EINVAL;
if (kaddr + size > area->addr + get_vm_area_size(area))
@@ -3496,6 +3496,9 @@ static int s_show(struct seq_file *m, void *p)
if (v->flags & VM_USERMAP)
seq_puts(m, " user");
+ if (v->flags & VM_DMA_COHERENT)
+ seq_puts(m, " dma-coherent");
+
if (is_vmalloc_addr(v->pages))
seq_puts(m, " vpages");