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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-02-20 22:01:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-21 16:54:03 +0100 |
| commit | 0e34d226342c27c4f96138b211547d423e4be8a1 (patch) | |
| tree | 037cfd309b4455e7b29c0afdcfb59baeb7fc405e /arch | |
| parent | d72f4e29e6d84b7ec02ae93088aa459ac70e733b (diff) | |
| download | linux-0e34d226342c27c4f96138b211547d423e4be8a1.tar.bz2 | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 7a53879ec689..b0ae0c3e3815 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 |