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@xxxxxxxxxxxxxxx>
---
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
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