From 98f180837a896ecedf8f7e12af22b57f271d43c9 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 8 Dec 2020 16:13:57 -0800 Subject: mm: Make mem_dump_obj() handle vmalloc() memory This commit adds vmalloc() support to mem_dump_obj(). Note that the vmalloc_dump_obj() function combines the checking and dumping, in contrast with the split between kmem_valid_obj() and kmem_dump_obj(). The reason for the difference is that the checking in the vmalloc() case involves acquiring a global lock, and redundant acquisitions of global locks should be avoided, even on not-so-fast paths. Note that this change causes on-stack variables to be reported as vmalloc() storage from kernel_clone() or similar, depending on the degree of inlining that your compiler does. This is likely more helpful than the earlier "non-paged (local) memory". Cc: Andrew Morton Cc: Joonsoo Kim Cc: Reported-by: Andrii Nakryiko Acked-by: Vlastimil Babka Tested-by: Naresh Kamboju Signed-off-by: Paul E. McKenney --- include/linux/vmalloc.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/vmalloc.h') diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 80c0181c411d..c18f4751a704 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -246,4 +246,10 @@ pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) int register_vmap_purge_notifier(struct notifier_block *nb); int unregister_vmap_purge_notifier(struct notifier_block *nb); +#ifdef CONFIG_MMU +bool vmalloc_dump_obj(void *object); +#else +static inline bool vmalloc_dump_obj(void *object) { return false; } +#endif + #endif /* _LINUX_VMALLOC_H */ -- cgit v1.2.3