Revert "block: Add a new REQ_PRIO, f2fs quick hack"

This reverts commit 43be30509a4a0becee1e983ca33b74eb33210e71.
block: separate priority boosting from REQ_META

Add a new REQ_PRIO to let requests preempt others in the cfq I/O schedule,
and lave REQ_META purely for marking requests as metadata in blktrace.

All existing callers of REQ_META except for XFS are updated to also
set REQ_PRIO for now.

Backported to 3.0.x by Ketut Putu Kumajaya <ketut.kumajaya@gmail.com>
Stop the spams
netfilter: qtaguid: rate limit some of the printks

Some of the printks are in the packet handling path.
We now ratelimit the very unlikely errors to avoid
kmsg spamming.

Signed-off-by: JP Abgrall <jpa@google.com>
Add Simple I/O scheduler
Add V(R) I/O scheduler
rwsem: R/W semaphores implemented using ARM atomic functions
cpufreq_interactive: Merge espresso10 interactive CPU governor
kernel/signal.c: stop info leak via the tkill and the tgkill syscalls

This fixes a kernel memory contents leak via the tkill and tgkill syscalls
for compat processes.
This is visible in the siginfo_t->_sifields._rt.si_sigval.sival_ptr field
when handling signals delivered from tkill.
The place of the infoleak:
int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
...
put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr);
...
}