Greg Kroah-Hartman
5d392794b2
Link: https://lore.kernel.org/r/20251127144032.705323598@linuxfoundation.org Tested-by: Pavel Machek (CIP) <pavel@denx.de> Link: https://lore.kernel.org/r/20251127150346.125775439@linuxfoundation.org Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Linux Kernel Functional Testing <lkft@linaro.org> Tested-by: Dileep Malepu <dileep.debian@gmail.com> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/fault-inject.h>
|
|
#include <linux/error-injection.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
#include "slab.h"
|
|
|
|
static struct {
|
|
struct fault_attr attr;
|
|
bool ignore_gfp_reclaim;
|
|
bool cache_filter;
|
|
} failslab = {
|
|
.attr = FAULT_ATTR_INITIALIZER,
|
|
.ignore_gfp_reclaim = true,
|
|
.cache_filter = false,
|
|
};
|
|
|
|
int should_failslab(struct kmem_cache *s, gfp_t gfpflags)
|
|
{
|
|
int flags = 0;
|
|
|
|
/* No fault-injection for bootstrap cache */
|
|
if (unlikely(s == kmem_cache))
|
|
return 0;
|
|
|
|
if (gfpflags & __GFP_NOFAIL)
|
|
return 0;
|
|
|
|
if (failslab.ignore_gfp_reclaim &&
|
|
(gfpflags & __GFP_DIRECT_RECLAIM))
|
|
return 0;
|
|
|
|
if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
|
|
return 0;
|
|
|
|
/*
|
|
* In some cases, it expects to specify __GFP_NOWARN
|
|
* to avoid printing any information(not just a warning),
|
|
* thus avoiding deadlocks. See commit 6b9dbedbe349 for
|
|
* details.
|
|
*/
|
|
if (gfpflags & __GFP_NOWARN)
|
|
flags |= FAULT_NOWARN;
|
|
|
|
return should_fail_ex(&failslab.attr, s->object_size, flags) ? -ENOMEM : 0;
|
|
}
|
|
ALLOW_ERROR_INJECTION(should_failslab, ERRNO);
|
|
|
|
static int __init setup_failslab(char *str)
|
|
{
|
|
return setup_fault_attr(&failslab.attr, str);
|
|
}
|
|
__setup("failslab=", setup_failslab);
|
|
|
|
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
|
|
static int __init failslab_debugfs_init(void)
|
|
{
|
|
struct dentry *dir;
|
|
umode_t mode = S_IFREG | 0600;
|
|
|
|
dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
|
|
if (IS_ERR(dir))
|
|
return PTR_ERR(dir);
|
|
|
|
debugfs_create_bool("ignore-gfp-wait", mode, dir,
|
|
&failslab.ignore_gfp_reclaim);
|
|
debugfs_create_bool("cache-filter", mode, dir,
|
|
&failslab.cache_filter);
|
|
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(failslab_debugfs_init);
|
|
|
|
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
|