Commit-ID: 6014809adf04188c4bce4a5d231f13a602203c95 Gitweb: https://git.kernel.org/tip/6014809adf04188c4bce4a5d231f13a602203c95 Author: Dominik Brodowski <li...@dominikbrodowski.net> AuthorDate: Tue, 20 Feb 2018 22:01:08 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Wed, 21 Feb 2018 10:04:46 +0100
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 <torva...@linux-foundation.org> Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net> Acked-by: Thomas Gleixner <t...@linutronix.de> Cc: Andy Lutomirski <l...@kernel.org> Cc: Borislav Petkov <b...@alien8.de> Cc: Brian Gerst <brge...@gmail.com> Cc: David Woodhouse <dw...@infradead.org> Cc: Denys Vlasenko <dvlas...@redhat.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Josh Poimboeuf <jpoim...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: dan.j.willi...@intel.com Link: http://lkml.kernel.org/r/20180220210113.6725-2-li...@dominikbrodowski.net Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/entry/entry_64.S | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 7a53879..b0ae0c3 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -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
