From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Today, kfree_rcu() can only free objects allocated using kmalloc(). There have been attempts to extend that to kvfree(), but I think we should take it even further and allow freeing as many different objects as possible. It turns out many different kinds of memory allocations can be detected from the address. vmalloc() and percpu_alloc() can be detected by being in a particular range. kmalloc() and kmem_cache_alloc() can be detected from the struct page. __get_free_pages() and page_frag_alloc() are both freeable just by decrementing the refcount on the page. This allows us to delete many dozens of tiny rcu callbacks throughout the kernel, much as was done when kfree_rcu was added. Matthew Wilcox (4): decompression: Rename malloc and free Rename 'free' functions mm: Add free() rcu: Switch to using free() instead of kfree() crypto/lrw.c | 4 ++-- crypto/xts.c | 4 ++-- include/linux/decompress/mm.h | 10 ++++++---- include/linux/kernel.h | 2 ++ include/linux/rcupdate.h | 40 +++++++++++++++++++--------------------- include/linux/rcutiny.h | 2 +- include/linux/rcutree.h | 2 +- include/trace/events/rcu.h | 8 ++++---- kernel/rcu/rcu.h | 8 +++----- kernel/rcu/tree.c | 11 +++++------ mm/util.c | 39 +++++++++++++++++++++++++++++++++++++++ 11 files changed, 84 insertions(+), 46 deletions(-) -- 2.16.2
