From: Vlastimil Babka <vbabka@suse.cz>
Date: Fri, 28 May 2021 12:32:10 +0000 (+0200)
Subject: mm, slub: don't call flush_all() from slab_debug_trace_open()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=eafb1d64030abf5f885026c2074d120c13e0ca9d;p=linux.git

mm, slub: don't call flush_all() from slab_debug_trace_open()

slab_debug_trace_open() can only be called on caches with SLAB_STORE_USER flag
and as with all slub debugging flags, such caches avoid cpu or percpu partial
slabs altogether, so there's nothing to flush.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Christoph Lameter <cl@linux.com>
---

diff --git a/mm/slub.c b/mm/slub.c
index f77d8cd79ef7f..f6063ec97a554 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5825,9 +5825,6 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep)
 	if (!alloc_loc_track(t, PAGE_SIZE / sizeof(struct location), GFP_KERNEL))
 		return -ENOMEM;
 
-	/* Push back cpu slabs */
-	flush_all(s);
-
 	for_each_kmem_cache_node(s, node, n) {
 		unsigned long flags;
 		struct page *page;