x86/unwind: Read stack return address in update_stack_state()
Instead of reading the return address when unwind_get_return_address() is called, read it from update_stack_state() and store it in the unwind state. This enables the next patch to check the return address from unwind_next_frame() so it can detect an entry code frame. Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com> Acked-by: NThomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/af0c5e4560c49c0343dca486ea26c4fa92bc4e35.1492020577.git.jpoimboe@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
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