Some architecture would like to be triggered when a memory area is moved
through the mremap system call.
This patch is introducing a new arch_remap mm hook which is placed in the
path of mremap, and is called before the old area is unmapped (and the
arch_unmap hook is called).
The architectures which need to call this hook should define
__HAVE_ARCH_REMAP in their asm/mmu_context.h and provide the arch_remap
service with the following prototype:
void arch_remap(struct mm_struct *mm,
unsigned long old_start, unsigned long old_end,
unsigned long new_start, unsigned long new_end);
Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
---
mm/mremap.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/mm/mremap.c b/mm/mremap.c
index 57dadc025c64..bafc234db45c 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -25,6 +25,7 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
#include "internal.h"
@@ -286,8 +287,14 @@ static unsigned long move_vma(struct vm_area_struct *vma,
old_len = new_len;
old_addr = new_addr;
new_addr = -ENOMEM;
- } else if (vma->vm_file && vma->vm_file->f_op->mremap)
- vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+ } else {
+ if (vma->vm_file && vma->vm_file->f_op->mremap)
+ vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+#ifdef __HAVE_ARCH_REMAP
+ arch_remap(mm, old_addr, old_addr+old_len,
+ new_addr, new_addr+new_len);
+#endif
+ }
/* Conceal VM_ACCOUNT so old reservation is not undone */
if (vm_flags & VM_ACCOUNT) {
--
1.9.1
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