On 1/9/22 20:23, Matthew Wilcox (Oracle) wrote:
This macro doesn't simplify the users; it's easier to just call
compound_next() inside a standard loop.
Yes it is. :)
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
Looks great.
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
thanks,
--
John Hubbard
NVIDIA
mm/gup.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/mm/gup.c b/mm/gup.c
index 7a07e0c00bf5..86f8d843de72 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -253,9 +253,6 @@ static inline void compound_next(unsigned long i, unsigned long npages,
struct page *page;
unsigned int nr;
- if (i >= npages)
- return;
-
page = compound_head(list[i]);
for (nr = i + 1; nr < npages; nr++) {
if (compound_head(list[nr]) != page)
@@ -266,12 +263,6 @@ static inline void compound_next(unsigned long i, unsigned long npages,
*ntails = nr - i;
}
-#define for_each_compound_head(__i, __list, __npages, __head, __ntails) \
- for (__i = 0, \
- compound_next(__i, __npages, __list, &(__head), &(__ntails)); \
- __i < __npages; __i += __ntails, \
- compound_next(__i, __npages, __list, &(__head), &(__ntails)))
-
/**
* unpin_user_pages_dirty_lock() - release and optionally dirty gup-pinned pages
* @pages: array of pages to be maybe marked dirty, and definitely released.
@@ -306,7 +297,8 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
return;
}
- for_each_compound_head(index, pages, npages, head, ntails) {
+ for (index = 0; index < npages; index += ntails) {
+ compound_next(index, npages, pages, &head, &ntails);
/*
* Checking PageDirty at this point may race with
* clear_page_dirty_for_io(), but that's OK. Two key
@@ -394,8 +386,10 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
if (WARN_ON(IS_ERR_VALUE(npages)))
return;
- for_each_compound_head(index, pages, npages, head, ntails)
+ for (index = 0; index < npages; index += ntails) {
+ compound_next(index, npages, pages, &head, &ntails);
put_compound_head(head, ntails, FOLL_PIN);
+ }
}
EXPORT_SYMBOL(unpin_user_pages);
