x86/asm: Carve out a generic movdir64b() helper for general usage
Carve out the MOVDIR64B inline asm primitive into a generic helper so that it can be used by other functions. Move it to special_insns.h and have iosubmit_cmds512() call it. [ bp: Massage commit message. ] Suggested-by: Michael Matz <matz@suse.de> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20201005151126.657029-2-dave.jiang@intel.com
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