Commit 0e34d226 authored by Dominik Brodowski's avatar Dominik Brodowski Committed by Ingo Molnar

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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Acked-by: default avatarThomas 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.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent d72f4e29
...@@ -525,6 +525,14 @@ END(irq_entries_start) ...@@ -525,6 +525,14 @@ END(irq_entries_start)
* *
* Entry runs with interrupts off. * 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) */ /* 0(%rsp): ~(interrupt number) */
.macro interrupt func .macro interrupt func
...@@ -536,8 +544,7 @@ END(irq_entries_start) ...@@ -536,8 +544,7 @@ END(irq_entries_start)
call switch_to_thread_stack call switch_to_thread_stack
1: 1:
PUSH_AND_CLEAR_REGS call interrupt_entry
ENCODE_FRAME_POINTER
testb $3, CS(%rsp) testb $3, CS(%rsp)
jz 1f jz 1f
......
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