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https://github.com/torvalds/linux.git
synced 2026-09-25 21:21:09 -04:00
Qi Zheng
3f913fc5f9
We expect no warnings to be issued when we specify __GFP_NOWARN, but currently in paths like alloc_pages() and kmalloc(), there are still some warnings printed, fix it. But for some warnings that report usage problems, we don't deal with them. If such warnings are printed, then we should fix the usage problems. Such as the following case: WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); [[email protected]: v2] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Qi Zheng <[email protected]> Cc: Akinobu Mita <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Jiri Slaby <[email protected]> Cc: Steven Rostedt (Google) <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/fault-inject.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include "slab.h"
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static struct {
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struct fault_attr attr;
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bool ignore_gfp_reclaim;
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bool cache_filter;
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} failslab = {
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.attr = FAULT_ATTR_INITIALIZER,
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.ignore_gfp_reclaim = true,
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.cache_filter = false,
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};
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bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
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{
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/* No fault-injection for bootstrap cache */
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if (unlikely(s == kmem_cache))
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return false;
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if (gfpflags & __GFP_NOFAIL)
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return false;
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if (failslab.ignore_gfp_reclaim &&
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(gfpflags & __GFP_DIRECT_RECLAIM))
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return false;
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if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
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return false;
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if (gfpflags & __GFP_NOWARN)
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failslab.attr.no_warn = true;
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return should_fail(&failslab.attr, s->object_size);
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}
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static int __init setup_failslab(char *str)
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{
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return setup_fault_attr(&failslab.attr, str);
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}
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__setup("failslab=", setup_failslab);
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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static int __init failslab_debugfs_init(void)
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{
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struct dentry *dir;
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umode_t mode = S_IFREG | 0600;
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dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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debugfs_create_bool("ignore-gfp-wait", mode, dir,
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&failslab.ignore_gfp_reclaim);
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debugfs_create_bool("cache-filter", mode, dir,
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&failslab.cache_filter);
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return 0;
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}
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late_initcall(failslab_debugfs_init);
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#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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