locking/atomics: Update comment about READ_ONCE() and structures
The comment is out of data. Also point out the performance drawback of the barrier();__builtin_memcpy(); barrier() followed by another copy from stack (__u) to lvalue; Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1453757600-11441-1-git-send-email-konrad.wilk@oracle.com [ Made it a bit more readable. ] Signed-off-by: NIngo Molnar <mingo@kernel.org>
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