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mm: convert mem_cgroup_css_from_page() to mem_cgroup_css_from_folio()

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Only one caller doesn't have a folio, so move the page_folio() call to
that one caller from mem_cgroup_css_from_folio().

Link: https://lkml.kernel.org/r/20230116192507.2146150-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-01-16 19:25:07 +00:00 committed by Andrew Morton
parent 9cfb816b1c
commit 75376c6fb9
3 changed files with 10 additions and 10 deletions
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6
fs/fs-writeback.c
View file

@ -246,7 +246,7 @@ void __inode_attach_wb(struct inode *inode, struct folio *folio)
struct cgroup_subsys_state *memcg_css;
if (folio) {
memcg_css = mem_cgroup_css_from_page(&folio->page);
memcg_css = mem_cgroup_css_from_folio(folio);
wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC);
} else {
/* must pin memcg_css, see wb_get_create() */
@ -859,6 +859,7 @@ EXPORT_SYMBOL_GPL(wbc_detach_inode);
void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
size_t bytes)
{
struct folio *folio;
struct cgroup_subsys_state *css;
int id;
@ -871,7 +872,8 @@ void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
if (!wbc->wb || wbc->no_cgroup_owner)
return;
css = mem_cgroup_css_from_page(page);
folio = page_folio(page);
css = mem_cgroup_css_from_folio(folio);
/* dead cgroups shouldn't contribute to inode ownership arbitration */
if (!(css->flags & CSS_ONLINE))
return;

2
include/linux/memcontrol.h
View file

@ -890,7 +890,7 @@ static inline bool mm_match_cgroup(struct mm_struct *mm,
return match;
}
struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
struct cgroup_subsys_state *mem_cgroup_css_from_folio(struct folio *folio);
ino_t page_cgroup_ino(struct page *page);
static inline bool mem_cgroup_online(struct mem_cgroup *memcg)

12
mm/memcontrol.c
View file

@ -350,21 +350,19 @@ EXPORT_SYMBOL(memcg_kmem_enabled_key);
#endif
/**
* mem_cgroup_css_from_page - css of the memcg associated with a page
* @page: page of interest
* mem_cgroup_css_from_folio - css of the memcg associated with a folio
* @folio: folio of interest
*
* If memcg is bound to the default hierarchy, css of the memcg associated
* with @page is returned. The returned css remains associated with @page
* with @folio is returned. The returned css remains associated with @folio
* until it is released.
*
* If memcg is bound to a traditional hierarchy, the css of root_mem_cgroup
* is returned.
*/
struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page)
struct cgroup_subsys_state *mem_cgroup_css_from_folio(struct folio *folio)
{
struct mem_cgroup *memcg;
memcg = page_memcg(page);
struct mem_cgroup *memcg = folio_memcg(folio);
if (!memcg || !cgroup_subsys_on_dfl(memory_cgrp_subsys))
memcg = root_mem_cgroup;