From: Michal Hocko <mhocko@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Cristopher Lameter <clameter@sgi.com>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <js1304@gmail.com>, Pekka Enberg <penberg@kernel.org>,
<linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.com>
Subject: [PATCH 1/2] slab: make GFP_SLAB_BUG_MASK information more human readable
Date: Fri, 10 Jun 2016 10:43:19 +0200 [thread overview]
Message-ID: <1465548200-11384-1-git-send-email-mhocko@kernel.org> (raw)
From: Michal Hocko <mhocko@suse.com>
printk offers %pGg for quite some time so let's use it to get a human
readable list of invalid flags.
The original output would be
[ 429.191962] gfp: 2
after the change
[ 429.191962] Unexpected gfp: 0x2 (__GFP_HIGHMEM)
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
mm/slab.c | 3 ++-
mm/slub.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 763096a247f6..03fb724d6e48 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2686,7 +2686,8 @@ static struct page *cache_grow_begin(struct kmem_cache *cachep,
* critical path in kmem_cache_alloc().
*/
if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
- pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
+ gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK;
+ pr_emerg("Unexpected gfp: %#x (%pGg)\n", invalid_mask, &invalid_mask);
BUG();
}
local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
diff --git a/mm/slub.c b/mm/slub.c
index cbf4e0e07d41..dd5a9eee7df5 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1628,7 +1628,8 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
{
if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
- pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
+ gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK;
+ pr_emerg("Unexpected gfp: %#x (%pGg)\n", invalid_mask, &invalid_mask);
BUG();
}
--
2.8.1
next reply other threads:[~2016-06-10 8:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-10 8:43 Michal Hocko [this message]
2016-06-10 8:43 ` [PATCH 2/2] slab: do not panic on invalid gfp_mask Michal Hocko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1465548200-11384-1-git-send-email-mhocko@kernel.org \
--to=mhocko@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=clameter@sgi.com \
--cc=js1304@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=penberg@kernel.org \
--cc=rientjes@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).