The patch titled
Subject: mm: use mm_populate() when adjusting brk with MCL_FUTURE in effect
has been added to the -mm tree. Its filename is
mm-use-mm_populate-when-adjusting-brk-with-mcl_future-in-effect.patch
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------------------------------------------------------
From: Michel Lespinasse <walken@xxxxxxxxxx>
Subject: mm: use mm_populate() when adjusting brk with MCL_FUTURE in effect
Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Tested-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Greg Ungerer <gregungerer@xxxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff -puN mm/mmap.c~mm-use-mm_populate-when-adjusting-brk-with-mcl_future-in-effect mm/mmap.c
--- a/mm/mmap.c~mm-use-mm_populate-when-adjusting-brk-with-mcl_future-in-effect
+++ a/mm/mmap.c
@@ -255,6 +255,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
unsigned long newbrk, oldbrk;
struct mm_struct *mm = current->mm;
unsigned long min_brk;
+ bool populate;
down_write(&mm->mmap_sem);
@@ -304,8 +305,15 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
/* Ok, looks good - let it rip. */
if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)
goto out;
+
set_brk:
mm->brk = brk;
+ populate = newbrk > oldbrk && (mm->def_flags & VM_LOCKED) != 0;
+ up_write(&mm->mmap_sem);
+ if (populate)
+ mm_populate(oldbrk, newbrk - oldbrk);
+ return brk;
+
out:
retval = mm->brk;
up_write(&mm->mmap_sem);
@@ -2599,10 +2607,8 @@ static unsigned long do_brk(unsigned lon
out:
perf_event_mmap(vma);
mm->total_vm += len >> PAGE_SHIFT;
- if (flags & VM_LOCKED) {
- if (!mlock_vma_pages_range(vma, addr, addr + len))
- mm->locked_vm += (len >> PAGE_SHIFT);
- }
+ if (flags & VM_LOCKED)
+ mm->locked_vm += (len >> PAGE_SHIFT);
return addr;
}
@@ -2610,10 +2616,14 @@ unsigned long vm_brk(unsigned long addr,
{
struct mm_struct *mm = current->mm;
unsigned long ret;
+ bool populate;
down_write(&mm->mmap_sem);
ret = do_brk(addr, len);
+ populate = ((mm->def_flags & VM_LOCKED) != 0);
up_write(&mm->mmap_sem);
+ if (populate)
+ mm_populate(addr, len);
return ret;
}
EXPORT_SYMBOL(vm_brk);
_
Patches currently in -mm which might be from walken@xxxxxxxxxx are
linux-next.patch
mm-make-mlockall-preserve-flags-other-than-vm_locked-in-def_flags.patch
mm-remap_file_pages-fixes.patch
mm-introduce-mm_populate-for-populating-new-vmas.patch
mm-use-mm_populate-for-blocking-remap_file_pages.patch
mm-use-mm_populate-when-adjusting-brk-with-mcl_future-in-effect.patch
mm-use-mm_populate-for-mremap-of-vm_locked-vmas.patch
mm-remove-flags-argument-to-mmap_region.patch
mm-remove-flags-argument-to-mmap_region-fix.patch
mm-directly-use-__mlock_vma_pages_range-in-find_extend_vma.patch
mm-introduce-vm_populate-flag-to-better-deal-with-racy-userspace-programs.patch
mm-make-do_mmap_pgoff-return-populate-as-a-size-in-bytes-not-as-a-bool.patch
mtd-mtd_nandecctest-use-prandom_bytes-instead-of-get_random_bytes.patch
mtd-mtd_oobtest-convert-to-use-prandom-library.patch
mtd-mtd_pagetest-convert-to-use-prandom-library.patch
mtd-mtd_speedtest-use-prandom_bytes.patch
mtd-mtd_subpagetest-convert-to-use-prandom-library.patch
mtd-mtd_stresstest-use-prandom_bytes.patch
mutex-subsystem-synchro-test-module.patch
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