The patch titled
Subject: mm/mprotect.c: optimize error detection in do_mprotect_pkey()
has been added to the -mm tree. Its filename is
mm-optimizing-error-condition-detection-in-do_mprotect_pkey.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-optimizing-error-condition-detection-in-do_mprotect_pkey.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-optimizing-error-condition-detection-in-do_mprotect_pkey.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
Subject: mm/mprotect.c: optimize error detection in do_mprotect_pkey()
Obviously, the error variable detection of the if statement is
for the mprotect callback function, so it is also put into the
scope of calling callbck.
Link: https://lkml.kernel.org/r/20210118133310.98375-1-tianjia.zhang@xxxxxxxxxxxxxxxxx
Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
Reported-by: Jia Zhang <zhang.jia@xxxxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mprotect.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/mm/mprotect.c~mm-optimizing-error-condition-detection-in-do_mprotect_pkey
+++ a/mm/mprotect.c
@@ -617,10 +617,11 @@ static int do_mprotect_pkey(unsigned lon
if (tmp > end)
tmp = end;
- if (vma->vm_ops && vma->vm_ops->mprotect)
+ if (vma->vm_ops && vma->vm_ops->mprotect) {
error = vma->vm_ops->mprotect(vma, nstart, tmp, newflags);
- if (error)
- goto out;
+ if (error)
+ goto out;
+ }
error = mprotect_fixup(vma, &prev, nstart, tmp, newflags);
if (error)
_
Patches currently in -mm which might be from tianjia.zhang@xxxxxxxxxxxxxxxxx are
mm-optimizing-error-condition-detection-in-do_mprotect_pkey.patch
