Hi all,
On Fri, 4 Dec 2020 20:20:05 +1100 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> Today's linux-next merge of the akpm-current tree got conflicts in:
>
> include/linux/memcontrol.h
> mm/memcontrol.c
>
> between commit:
>
> bcfe06bf2622 ("mm: memcontrol: Use helpers to read page's memcg data")
>
> from the bpf-next tree and commits:
>
> 6771a349b8c3 ("mm/memcg: remove incorrect comment")
> c3970fcb1f21 ("mm: move lruvec stats update functions to vmstat.h")
>
> from the akpm-current tree.
>
> I fixed it up (see below - I used the latter version of memcontrol.h)
> and can carry the fix as necessary. This is now fixed as far as
> linux-next is concerned, but any non trivial conflicts should be
> mentioned to your upstream maintainer when your tree is submitted for
> merging. You may also want to consider cooperating with the maintainer
> of the conflicting tree to minimise any particularly complex conflicts.
>
> I also added this merge fix patch:
>
> From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> Date: Fri, 4 Dec 2020 19:53:40 +1100
> Subject: [PATCH] fixup for "mm: move lruvec stats update functions to vmstat.h"
>
> conflict against "mm: memcontrol: Use helpers to read page's memcg data"
>
> Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> ---
> mm/memcontrol.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 6f5733779927..3b6db4e906b5 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -851,16 +851,17 @@ void __mod_lruvec_page_state(struct page *page, enum node_stat_item idx,
> int val)
> {
> struct page *head = compound_head(page); /* rmap on tail pages */
> + struct mem_cgroup *memcg = page_memcg(head);
> pg_data_t *pgdat = page_pgdat(page);
> struct lruvec *lruvec;
>
> /* Untracked pages have no memcg, no lruvec. Update only the node */
> - if (!head->mem_cgroup) {
> + if (!memcg) {
> __mod_node_page_state(pgdat, idx, val);
> return;
> }
>
> - lruvec = mem_cgroup_lruvec(head->mem_cgroup, pgdat);
> + lruvec = mem_cgroup_lruvec(memcg, pgdat);
> __mod_lruvec_state(lruvec, idx, val);
> }
>
> --
> 2.29.2
>
> --
> Cheers,
> Stephen Rothwell
>
> diff --cc include/linux/memcontrol.h
> index 320369c841f5,ff02f831e7e1..000000000000
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> diff --cc mm/memcontrol.c
> index 7535042ac1ec,c9a5dce4343d..000000000000
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@@ -2880,9 -2984,9 +2975,9 @@@ static void cancel_charge(struct mem_cg
>
> static void commit_charge(struct page *page, struct mem_cgroup *memcg)
> {
> - VM_BUG_ON_PAGE(page->mem_cgroup, page);
> + VM_BUG_ON_PAGE(page_memcg(page), page);
> /*
> - * Any of the following ensures page->mem_cgroup stability:
> + * Any of the following ensures page's memcg stability:
> *
> * - the page lock
> * - LRU isolation
> @@@ -6977,11 -7012,10 +6997,10 @@@ void mem_cgroup_migrate(struct page *ol
> return;
>
> /* Page cache replacement: new page already charged? */
> - if (newpage->mem_cgroup)
> + if (page_memcg(newpage))
> return;
>
> - /* Swapcache readahead pages can get replaced before being charged */
> - memcg = oldpage->mem_cgroup;
> + memcg = page_memcg(oldpage);
> if (!memcg)
> return;
>
Just a reminder that this conflict still exists. Commit bcfe06bf2622
is now in the net-next tree.
--
Cheers,
Stephen Rothwell
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