On Tue, 31 Mar 2015, Andrey Ryabinin wrote: > > We don't have a need to set PAGE_EXT_DEBUG_POISON on these pages sitting > > in the reserved pool, nor do we have a need to do kmap_atomic() since it's > > already mapped and must be mapped to be on the reserved pool, which is > > handled by mempool_free(). > > > > Hmm.. I just realized that this statement might be wrong. > Why pages has to be mapped to be on reserved pool? > mempool could be used for highmem pages and there is no need to kmap() > until these pages will be used. > > drbd (drivers/block/drbd) already uses mempool for highmem pages: > Yes, you're exactly right, I didn't see this because the mempool is created in one file and then solely used in another file, but regardless we still need protection from this usecase. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>