Kernel cleanup:
Revert "random: fix accounting race condition with lockless irq entropy_count update"

This reverts commit 208a497e608476f04b3baf590209cea7b3eddce4.

Revert "vfs: allow O_PATH file descriptors for fstatfs()"

This reverts commit 70e99f4bf13b9bfa2341d5fdd7bfc6d779473598.

Revert "mm: highmem: don't treat PKMAP_ADDR(LAST_PKMAP) as a highmem address"

This reverts commit ac5f08f3979cfb5df1704fd4963b8d8fd8d3b2fc.

Revert "mm: highmem: export kmap_to_page for modules"

This reverts commit fc83227c4a2d00933407d79a438a56428e38b941.

Revert "mm: add kmap_to_page()"

This reverts commit 800000910542a806bdfb5ab4ae12ea8ae873c096.

Revert "fix false disconnect due to a signal sent to the reading process"

This reverts commit e726ab66eafde43241427f82e55b456fb3f89be9.