Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 asm changes from Ingo Molnar:
 "The main changes in this cycle were the x86/entry and sysret
  enhancements from Andy Lutomirski, see merge commits 772a9aca125 and
  b57c0b5175dd for details"

[ Exectutive summary: IST exceptions that interrupt user space will run
  on the regular kernel stack instead of the IST stack.  Which
  simplifies things particularly on return to user space.

  The sysret cleanup ends up simplifying the logic on when we can use
  sysret vs when we have to use iret.                - Linus ]

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86_64, entry: Remove the syscall exit audit and schedule optimizations
  x86_64, entry: Use sysret to return to userspace when possible
  x86, traps: Fix ist_enter from userspace
  x86, vdso: teach 'make clean' remove vdso64 binaries
  x86_64 entry: Fix RCX for ptraced syscalls
  x86: entry_64.S: fold SAVE_ARGS_IRQ macro into its sole user
  x86: ia32entry.S: fix wrong symbolic constant usage: R11->ARGOFFSET
  x86: entry_64.S: delete unused code
  x86, mce: Get rid of TIF_MCE_NOTIFY and associated mce tricks
  x86, traps: Add ist_begin_non_atomic and ist_end_non_atomic
  x86: Clean up current_stack_pointer
  x86, traps: Track entry into and exit from IST context
  x86, entry: Switch stacks on a paranoid entry from userspace

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