x86/entry/64: Document idtentry
The idtentry macro is complicated and magical. Document what it does to help future readers and to allow future patches to adjust the code and docs at the same time. Signed-off-by: NAndy Lutomirski <luto@kernel.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NBorislav Petkov <bp@suse.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lkml.kernel.org/r/6e56c3ad94879e41afe345750bc28ccc0e820ea8.1536015544.git.luto@kernel.org
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