lkml.org 
[lkml]   [2016]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] page-flags: make page flag helpers accept struct head_page
Date
This patch makes all generated page flag helpers to accept pointer to
struct head_page as well as struct page.

In case if pointer to struct head_page is passed, we assume that it's
head page and bypass policy constrain checks.

Note, to get get inteface consistent we would need to make non-generated
page flag helper to accept struct head_page as well.

Not-yet-signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
scripts/mkpageflags.sh | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/scripts/mkpageflags.sh b/scripts/mkpageflags.sh
index 29d46bccaea4..272aab4ad1a3 100755
--- a/scripts/mkpageflags.sh
+++ b/scripts/mkpageflags.sh
@@ -6,23 +6,23 @@ fatal() {
}

any() {
- echo "(__p)"
+ echo "((struct page *)(__p))"
}

head() {
- echo "compound_head(__p)"
+ echo "compound_head((struct page *)(__p))"
}

no_tail() {
local enforce="${1:+VM_BUG_ON_PGFLAGS(PageTail(__p), __p);}"

- echo "({$enforce compound_head(__p);})"
+ echo "({$enforce compound_head((struct page *)(__p));})"
}

no_compound() {
local enforce="${1:+VM_BUG_ON_PGFLAGS(PageCompound(__p), __p);}"

- echo "({$enforce __p;})"
+ echo "({$enforce ((struct page *)(__p));})"
}

generate_test() {
@@ -34,7 +34,9 @@ generate_test() {
cat <<EOF
#define $uname(__p) ({ \\
int ret; \\
- if (__builtin_types_compatible_p(typeof(*(__p)), struct page)) \\
+ if (__builtin_types_compatible_p(typeof(*(__p)), struct head_page)) \\
+ ret = $op(PG_$lname, &((struct head_page *)(__p))->page.flags); \\
+ else if (__builtin_types_compatible_p(typeof(*(__p)), struct page)) \\
ret = $op(PG_$lname, &$page->flags); \\
else \\
BUILD_BUG(); \\
@@ -52,7 +54,9 @@ generate_mod() {

cat <<EOF
#define $uname(__p) do { \\
- if (__builtin_types_compatible_p(typeof(*(__p)), struct page)) \\
+ if (__builtin_types_compatible_p(typeof(*(__p)), struct head_page)) \\
+ $op(PG_$lname, &((struct head_page *)(__p))->page.flags); \\
+ else if (__builtin_types_compatible_p(typeof(*(__p)), struct page)) \\
$op(PG_$lname, &$page->flags); \\
else \\
BUILD_BUG(); \\
--
2.8.0.rc3
\
 
 \ /
  Last update: 2016-03-27 22:21    [W:0.046 / U:0.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site