Subject: Re: linux-next: build failure after merge of the akpm tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 16 Nov 2020 17:17:04 +1100

Hi Mike,

On Sun, 15 Nov 2020 11:01:05 +0200 Mike Rapoport <[email-masked]> wrote:
>
> My preference would be to put the entire function body in '#ifdef
> CONFIG_MEMCG' here.

OK, so today I used this:

From: Stephen Rothwell <[email-masked]>
Date: Mon, 16 Nov 2020 16:55:10 +1100
Subject: [PATCH] secretmem-add-memcg-accounting-fix2

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 mm/secretmem.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/secretmem.c b/mm/secretmem.c
index 5ed6b2070136..c7a37b2d01ed 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -59,6 +59,7 @@ bool secretmem_active(void)
 
 static int secretmem_memcg_charge(struct page *page, gfp_t gfp, int order)
 {
+#ifdef CONFIG_MEMCG
 	unsigned long nr_pages = (1 << order);
 	int i, err;
 
@@ -72,11 +73,13 @@ static int secretmem_memcg_charge(struct page *page, gfp_t gfp, int order)
 		p->memcg_data = page->memcg_data;
 	}
 
+#endif
 	return 0;
 }
 
 static void secretmem_memcg_uncharge(struct page *page, int order)
 {
+#ifdef CONFIG_MEMCG
 	unsigned long nr_pages = (1 << order);
 	int i;
 
@@ -87,6 +90,7 @@ static void secretmem_memcg_uncharge(struct page *page, int order)
 	}
 
 	memcg_kmem_uncharge_page(page, PMD_PAGE_ORDER);
+#endif
 }
 
 static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
-- 
2.29.2

-- 
Cheers,
Stephen Rothwell