mm: no need to check return value of debugfs_create functions
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Link: http://lkml.kernel.org/r/20190122152151.16139-14-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: Laura Abbott <labbott@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -191,8 +191,6 @@ static int __init cma_debugfs_init(void)
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int i;
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cma_debugfs_root = debugfs_create_dir("cma", NULL);
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if (!cma_debugfs_root)
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return -ENOMEM;
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for (i = 0; i < cma_area_count; i++)
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cma_debugfs_add_one(&cma_areas[i], i);
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@ -48,18 +48,12 @@ static int __init failslab_debugfs_init(void)
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
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&failslab.ignore_gfp_reclaim))
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goto fail;
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if (!debugfs_create_bool("cache-filter", mode, dir,
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&failslab.cache_filter))
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goto fail;
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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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fail:
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debugfs_remove_recursive(dir);
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return -ENOMEM;
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}
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late_initcall(failslab_debugfs_init);
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@ -122,12 +122,8 @@ static const struct file_operations gup_benchmark_fops = {
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static int gup_benchmark_init(void)
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{
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void *ret;
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ret = debugfs_create_file_unsafe("gup_benchmark", 0600, NULL, NULL,
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&gup_benchmark_fops);
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if (!ret)
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pr_warn("Failed to create gup_benchmark in debugfs");
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debugfs_create_file_unsafe("gup_benchmark", 0600, NULL, NULL,
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&gup_benchmark_fops);
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return 0;
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}
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@ -2887,12 +2887,8 @@ DEFINE_SIMPLE_ATTRIBUTE(split_huge_pages_fops, NULL, split_huge_pages_set,
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static int __init split_huge_pages_debugfs(void)
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{
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void *ret;
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ret = debugfs_create_file("split_huge_pages", 0200, NULL, NULL,
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&split_huge_pages_fops);
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if (!ret)
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pr_warn("Failed to create split_huge_pages in debugfs");
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debugfs_create_file("split_huge_pages", 0200, NULL, NULL,
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&split_huge_pages_fops);
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return 0;
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}
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late_initcall(split_huge_pages_debugfs);
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@ -2005,8 +2005,7 @@ DEFINE_SHOW_ATTRIBUTE(memblock_debug);
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static int __init memblock_init_debugfs(void)
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{
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struct dentry *root = debugfs_create_dir("memblock", NULL);
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if (!root)
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return -ENXIO;
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debugfs_create_file("memory", 0444, root,
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&memblock.memory, &memblock_debug_fops);
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debugfs_create_file("reserved", 0444, root,
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@ -3334,12 +3334,8 @@ DEFINE_DEBUGFS_ATTRIBUTE(fault_around_bytes_fops,
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static int __init fault_around_debugfs(void)
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{
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void *ret;
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ret = debugfs_create_file_unsafe("fault_around_bytes", 0644, NULL, NULL,
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&fault_around_bytes_fops);
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if (!ret)
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pr_warn("Failed to create fault_around_bytes in debugfs");
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debugfs_create_file_unsafe("fault_around_bytes", 0644, NULL, NULL,
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&fault_around_bytes_fops);
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return 0;
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}
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late_initcall(fault_around_debugfs);
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@ -3230,24 +3230,14 @@ static int __init fail_page_alloc_debugfs(void)
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dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
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&fail_page_alloc.attr);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
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&fail_page_alloc.ignore_gfp_reclaim))
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goto fail;
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if (!debugfs_create_bool("ignore-gfp-highmem", mode, dir,
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&fail_page_alloc.ignore_gfp_highmem))
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goto fail;
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if (!debugfs_create_u32("min-order", mode, dir,
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&fail_page_alloc.min_order))
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goto fail;
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debugfs_create_bool("ignore-gfp-wait", mode, dir,
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&fail_page_alloc.ignore_gfp_reclaim);
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debugfs_create_bool("ignore-gfp-highmem", mode, dir,
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&fail_page_alloc.ignore_gfp_highmem);
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debugfs_create_u32("min-order", mode, dir, &fail_page_alloc.min_order);
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return 0;
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fail:
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debugfs_remove_recursive(dir);
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return -ENOMEM;
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}
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late_initcall(fail_page_alloc_debugfs);
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@ -625,16 +625,14 @@ static const struct file_operations proc_page_owner_operations = {
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static int __init pageowner_init(void)
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{
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struct dentry *dentry;
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if (!static_branch_unlikely(&page_owner_inited)) {
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pr_info("page_owner is disabled\n");
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return 0;
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}
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dentry = debugfs_create_file("page_owner", 0400, NULL,
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NULL, &proc_page_owner_operations);
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debugfs_create_file("page_owner", 0400, NULL, NULL,
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&proc_page_owner_operations);
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return PTR_ERR_OR_ZERO(dentry);
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return 0;
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}
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late_initcall(pageowner_init)
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15
mm/vmstat.c
15
mm/vmstat.c
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@ -2121,21 +2121,14 @@ static int __init extfrag_debug_init(void)
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struct dentry *extfrag_debug_root;
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extfrag_debug_root = debugfs_create_dir("extfrag", NULL);
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if (!extfrag_debug_root)
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return -ENOMEM;
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if (!debugfs_create_file("unusable_index", 0444,
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extfrag_debug_root, NULL, &unusable_file_ops))
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goto fail;
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debugfs_create_file("unusable_index", 0444, extfrag_debug_root, NULL,
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&unusable_file_ops);
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if (!debugfs_create_file("extfrag_index", 0444,
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extfrag_debug_root, NULL, &extfrag_file_ops))
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goto fail;
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debugfs_create_file("extfrag_index", 0444, extfrag_debug_root, NULL,
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&extfrag_file_ops);
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return 0;
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fail:
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debugfs_remove_recursive(extfrag_debug_root);
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return -ENOMEM;
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}
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module_init(extfrag_debug_init);
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