[PATCH 1/4] mm: Add optional close() to struct vm_special_mapping
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2024-08-07 12:41:18
Also in:
lkml
Subsystem:
memory management, memory management - core, memory mapping, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
Add an optional close() callback to struct vm_special_mapping. It will be used, by powerpc at least, to handle unmapping of the VDSO. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- include/linux/mm_types.h | 2 ++ mm/mmap.c | 3 +++ 2 files changed, 5 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 485424979254..ef32d87a3adc 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h@@ -1313,6 +1313,8 @@ struct vm_special_mapping { int (*mremap)(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma); + void (*close)(const struct vm_special_mapping *sm, + struct vm_area_struct *vma); }; enum tlb_flush_reason {
diff --git a/mm/mmap.c b/mm/mmap.c
index d0dfc85b209b..24bd6aa9155c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -3624,6 +3624,9 @@ static vm_fault_t special_mapping_fault(struct vm_fault *vmf); */ static void special_mapping_close(struct vm_area_struct *vma) { + const struct vm_special_mapping *sm = vma->vm_private_data; + if (sm->close) + sm->close(sm, vma); } static const char *special_mapping_name(struct vm_area_struct *vma)
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2.45.2