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Message-ID: <20240807124103.85644-1-mpe@ellerman.id.au>
Date: Wed, 7 Aug 2024 22:41:00 +1000
From: Michael Ellerman <mpe@...erman.id.au>
To: <linux-mm@...ck.org>
Cc: <linuxppc-dev@...ts.ozlabs.org>,
torvalds@...ux-foundation.org,
akpm@...ux-foundation.org,
christophe.leroy@...roup.eu,
jeffxu@...omium.org,
jeffxu@...gle.com,
Liam.Howlett@...cle.com,
linux-kernel@...r.kernel.org,
npiggin@...il.com,
oliver.sang@...el.com,
pedro.falcato@...il.com
Subject: [PATCH 1/4] mm: Add optional close() to struct vm_special_mapping
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@...ux-foundation.org>
Signed-off-by: Michael Ellerman <mpe@...erman.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)
--
2.45.2
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