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x86/entry/64: Move PUSH_AND_CLEAR_REGS from interrupt macro to helper function 

The PUSH_AND_CLEAR_REGS macro is able to insert the GP registers
"above" the original return address. This allows us to move a sizeable
part of the interrupt entry macro to an interrupt entry helper function:

   text	   data	    bss	    dec	    hex	filename
  21088	      0	      0	  21088	   5260	entry_64.o-orig
  18006	      0	      0	  18006	   4656	entry_64.o

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: dan.j.williams@intel.com
Link: http://lkml.kernel.org/r/20180220210113.6725-2-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dominik Brodowski 2018-02-20 22:01:08 +01:00 committed by Ingo Molnar
parent d72f4e29e6
commit 0e34d22634
1 changed files with 9 additions and 2 deletions
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11
arch/x86/entry/entry_64.S
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@ -525,6 +525,14 @@ END(irq_entries_start)
*
* Entry runs with interrupts off.
*/
ENTRY(interrupt_entry)
UNWIND_HINT_FUNC
PUSH_AND_CLEAR_REGS save_ret=1
ENCODE_FRAME_POINTER 8
ret
END(interrupt_entry)
/* 0(%rsp): ~(interrupt number) */
.macro interrupt func
@ -536,8 +544,7 @@ END(irq_entries_start)
call switch_to_thread_stack
1:
PUSH_AND_CLEAR_REGS
ENCODE_FRAME_POINTER
call interrupt_entry
testb $3, CS(%rsp)
jz 1f