From: Oliver Glitta <glittao@xxxxxxxxx> Subject: slub: remove resiliency_test() function Function resiliency_test() is hidden behind #ifdef SLUB_RESILIENCY_TEST that is not part of Kconfig, so nobody runs it. This function is replaced with KUnit test for SLUB added by the previous patch "selftests: add a KUnit test for SLUB debugging functionality". Link: https://lkml.kernel.org/r/20210511150734.3492-3-glittao@xxxxxxxxx Signed-off-by: Oliver Glitta <glittao@xxxxxxxxx> Reviewed-by: Marco Elver <elver@xxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Oliver Glitta <glittao@xxxxxxxxx> Cc: Brendan Higgins <brendanhiggins@xxxxxxxxxx> Cc: Daniel Latypov <dlatypov@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/slub.c | 64 ---------------------------------------------------- 1 file changed, 64 deletions(-) --- a/mm/slub.c~slub-remove-resiliency_test-function +++ a/mm/slub.c @@ -155,9 +155,6 @@ static inline bool kmem_cache_has_cpu_pa * - Variable sizing of the per node arrays */ -/* Enable to test recovery from slab corruption on boot */ -#undef SLUB_RESILIENCY_TEST - /* Enable to log cmpxchg failures */ #undef SLUB_DEBUG_CMPXCHG @@ -4938,66 +4935,6 @@ static int list_locations(struct kmem_ca } #endif /* CONFIG_SLUB_DEBUG */ -#ifdef SLUB_RESILIENCY_TEST -static void __init resiliency_test(void) -{ - u8 *p; - int type = KMALLOC_NORMAL; - - BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || KMALLOC_SHIFT_HIGH < 10); - - pr_err("SLUB resiliency testing\n"); - pr_err("-----------------------\n"); - pr_err("A. Corruption after allocation\n"); - - p = kzalloc(16, GFP_KERNEL); - p[16] = 0x12; - pr_err("\n1. kmalloc-16: Clobber Redzone/next pointer 0x12->0x%p\n\n", - p + 16); - - validate_slab_cache(kmalloc_caches[type][4]); - - /* Hmmm... The next two are dangerous */ - p = kzalloc(32, GFP_KERNEL); - p[32 + sizeof(void *)] = 0x34; - pr_err("\n2. kmalloc-32: Clobber next pointer/next slab 0x34 -> -0x%p\n", - p); - pr_err("If allocated object is overwritten then not detectable\n\n"); - - validate_slab_cache(kmalloc_caches[type][5]); - p = kzalloc(64, GFP_KERNEL); - p += 64 + (get_cycles() & 0xff) * sizeof(void *); - *p = 0x56; - pr_err("\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", - p); - pr_err("If allocated object is overwritten then not detectable\n\n"); - validate_slab_cache(kmalloc_caches[type][6]); - - pr_err("\nB. Corruption after free\n"); - p = kzalloc(128, GFP_KERNEL); - kfree(p); - *p = 0x78; - pr_err("1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); - validate_slab_cache(kmalloc_caches[type][7]); - - p = kzalloc(256, GFP_KERNEL); - kfree(p); - p[50] = 0x9a; - pr_err("\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p); - validate_slab_cache(kmalloc_caches[type][8]); - - p = kzalloc(512, GFP_KERNEL); - kfree(p); - p[512] = 0xab; - pr_err("\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); - validate_slab_cache(kmalloc_caches[type][9]); -} -#else -#ifdef CONFIG_SYSFS -static void resiliency_test(void) {}; -#endif -#endif /* SLUB_RESILIENCY_TEST */ - #ifdef CONFIG_SYSFS enum slab_stat_type { SL_ALL, /* All slabs */ @@ -5846,7 +5783,6 @@ static int __init slab_sysfs_init(void) } mutex_unlock(&slab_mutex); - resiliency_test(); return 0; } _
