The patch titled
Subject: mm: new arch_remap() hook
has been added to the -mm tree. Its filename is
mm-new-arch_remap-hook.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-new-arch_remap-hook.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-new-arch_remap-hook.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
Subject: mm: new arch_remap() hook
Some architectures would like to be triggered when a memory area is moved
through the mremap system call.
This patch introduces 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).
Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm-arch-hooks.h | 9 +++++++++
mm/mremap.c | 17 +++++++++++------
2 files changed, 20 insertions(+), 6 deletions(-)
diff -puN include/linux/mm-arch-hooks.h~mm-new-arch_remap-hook include/linux/mm-arch-hooks.h
--- a/include/linux/mm-arch-hooks.h~mm-new-arch_remap-hook
+++ a/include/linux/mm-arch-hooks.h
@@ -13,4 +13,13 @@
#include <asm/mm-arch-hooks.h>
+#ifndef arch_remap
+static inline void arch_remap(struct mm_struct *mm,
+ unsigned long old_start, unsigned long old_end,
+ unsigned long new_start, unsigned long new_end)
+{
+}
+#define arch_remap arch_remap
+#endif
+
#endif /* _LINUX_MM_ARCH_HOOKS_H */
diff -puN mm/mremap.c~mm-new-arch_remap-hook mm/mremap.c
--- a/mm/mremap.c~mm-new-arch_remap-hook
+++ a/mm/mremap.c
@@ -22,6 +22,7 @@
#include <linux/mmu_notifier.h>
#include <linux/sched/sysctl.h>
#include <linux/uaccess.h>
+#include <linux/mm-arch-hooks.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
@@ -286,13 +287,17 @@ static unsigned long move_vma(struct vm_
old_len = new_len;
old_addr = new_addr;
new_addr = -ENOMEM;
- } else if (vma->vm_file && vma->vm_file->f_op->mremap) {
- err = vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
- if (err < 0) {
- move_page_tables(new_vma, new_addr, vma, old_addr,
- moved_len, true);
- return err;
+ } else {
+ if (vma->vm_file && vma->vm_file->f_op->mremap) {
+ err = vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+ if (err < 0) {
+ move_page_tables(new_vma, new_addr, vma,
+ old_addr, moved_len, true);
+ return err;
+ }
}
+ arch_remap(mm, old_addr, old_addr + old_len,
+ new_addr, new_addr + new_len);
}
/* Conceal VM_ACCOUNT so old reservation is not undone */
_
Patches currently in -mm which might be from ldufour@xxxxxxxxxxxxxxxxxx are
mm-new-mm-hook-framework.patch
mm-new-arch_remap-hook.patch
powerpc-mm-tracking-vdso-remap.patch
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