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Message-ID: <ZMnUR61eFmO014EL@casper.infradead.org>
Date: Wed, 2 Aug 2023 04:57:59 +0100
From: Matthew Wilcox <willy@...radead.org>
To: thunder.leizhen@...weicloud.com
Cc: Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Vlastimil Babka <vbabka@...e.cz>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org,
"Paul E . McKenney" <paulmck@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
Joel Fernandes <joel@...lfernandes.org>,
Josh Triplett <josh@...htriplett.org>,
Boqun Feng <boqun.feng@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Zqiang <qiang.zhang1211@...il.com>, rcu@...r.kernel.org,
linux-kernel@...r.kernel.org, openeuler <kernel@...neuler.org>
Subject: Re: [PATCH v3 1/2] mm: Provide empty function for kmem_dump_obj()
when CONFIG_PRINTK=n
On Wed, Aug 02, 2023 at 11:45:16AM +0800, thunder.leizhen@...weicloud.com wrote:
> +++ b/include/linux/slab.h
> @@ -246,6 +246,9 @@ size_t ksize(const void *objp);
> #ifdef CONFIG_PRINTK
> bool kmem_valid_obj(void *object);
> void kmem_dump_obj(void *object);
> +#else
> +static inline bool kmem_valid_obj(void *object) { return false; }
That is very confusing. kmem_valid_obj() looks like a function which
should exist regardless of CONFIG_PRINTK and to have it always return
false if CONFIG_PRINTK isn't set seems weird.
I see we have one caller of kmem_valid_obj() right now. Which means it
shouldn't be an EXPORT_SYMBOL since that caller is not a module.
I think the right solution is to convert kmem_dump_obj() to
work the same way as vmalloc_dump_obj(). ie:
+++ b/mm/util.c
@@ -1057,11 +1057,8 @@ void mem_dump_obj(void *object)
{
const char *type;
- if (kmem_valid_obj(object)) {
- kmem_dump_obj(object);
+ if (kmem_dump_obj(object))
return;
- }
-
if (vmalloc_dump_obj(object))
return;
... with corresponding changes to eliminate kmem_valid_obj() as a
symbol.
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