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From: Dominik Brodowski <linux@dominikbrodowski.net>
To: linux-kernel@vger.kernel.org, mingo@kernel.org, x86@kernel.org,
	brgerst@gmail.com, luto@kernel.org, jpoimboe@redhat.com
Cc: torvalds@linux-foundation.org, ak@linux.intel.com,
	tglx@linutronix.de, dan.j.williams@intel.com
Subject: [RFC PATCH v3 5/6] x86/entry/64: move ASM_CLAC to interrupt_entry
Date: Tue, 20 Feb 2018 22:01:12 +0100	[thread overview]
Message-ID: <20180220210113.6725-6-linux@dominikbrodowski.net> (raw)
In-Reply-To: <20180220210113.6725-1-linux@dominikbrodowski.net>

Moving ASM_CLAC to interrupt_entry means two instructions (addq / pushq
and call interrupt_entry) are not covered by it. However, it offers a
noticeable size reduction (-.2k):

   text	   data	    bss	    dec	    hex	filename
  16882	      0	      0	  16882	   41f2	entry_64.o-orig
  16623	      0	      0	  16623	   40ef	entry_64.o

Suggested-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
 arch/x86/entry/entry_64.S | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 8ea03cf94a2d..42a4b652469d 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -572,6 +572,7 @@ END(irq_entries_start)
 /* 8(%rsp): ~(interrupt number) */
 ENTRY(interrupt_entry)
 	UNWIND_HINT_FUNC
+	ASM_CLAC
 	cld
 
 	testb	$3, CS-ORIG_RAX+8(%rsp)
@@ -614,7 +615,6 @@ END(interrupt_entry)
 	 */
 	.p2align CONFIG_X86_L1_CACHE_SHIFT
 common_interrupt:
-	ASM_CLAC
 	addq	$-0x80, (%rsp)			/* Adjust vector to [-256, -1] range */
 	call	interrupt_entry
 	UNWIND_HINT_REGS indirect=1
@@ -811,7 +811,6 @@ END(common_interrupt)
 .macro apicinterrupt3 num sym do_sym
 ENTRY(\sym)
 	UNWIND_HINT_IRET_REGS
-	ASM_CLAC
 	pushq	$~(\num)
 .Lcommon_\sym:
 	call	interrupt_entry
-- 
2.16.2

  parent reply	other threads:[~2018-02-20 21:02 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-20 21:01 [RFC PATCH v3 0/6] x86/entry/64: interrupt entry size reduction Dominik Brodowski
2018-02-20 21:01 ` [RFC PATCH v3 1/6] x86/entry/64: move PUSH_AND_CLEAR_REGS from interrupt macro to helper function Dominik Brodowski
2018-02-20 22:25   ` Linus Torvalds
2018-02-21  2:42     ` [PATCH] x86/entry/64: Simplify ENCODE_FRAME_POINTER Josh Poimboeuf
2018-02-21 10:50       ` [tip:x86/pti] " tip-bot for Josh Poimboeuf
2018-02-21 17:03       ` tip-bot for Josh Poimboeuf
2018-02-21 10:45   ` [tip:x86/pti] x86/entry/64: Move PUSH_AND_CLEAR_REGS from interrupt macro to helper function tip-bot for Dominik Brodowski
2018-02-21 16:58   ` tip-bot for Dominik Brodowski
2018-02-20 21:01 ` [RFC PATCH v3 2/6] x86/entry/64: move ENTER_IRQ_STACK from interrupt macro to interrupt_entry Dominik Brodowski
2018-02-21 10:46   ` [tip:x86/pti] x86/entry/64: Move " tip-bot for Dominik Brodowski
2018-02-21 16:59   ` tip-bot for Dominik Brodowski
2018-02-20 21:01 ` [RFC PATCH v3 3/6] x86/entry/64: move switch_to_thread_stack " Dominik Brodowski
2018-02-21 10:46   ` [tip:x86/pti] x86/entry/64: Move the switch_to_thread_stack() call to interrupt_entry() tip-bot for Dominik Brodowski
2018-02-21 16:59   ` tip-bot for Dominik Brodowski
2018-02-20 21:01 ` [RFC PATCH v3 4/6] x86/entry/64: remove interrupt macro Dominik Brodowski
2018-02-21 10:47   ` [tip:x86/pti] x86/entry/64: Remove 'interrupt' macro tip-bot for Dominik Brodowski
2018-02-21 17:00   ` tip-bot for Dominik Brodowski
2018-02-20 21:01 ` Dominik Brodowski [this message]
2018-02-21 10:47   ` [tip:x86/pti] x86/entry/64: Move ASM_CLAC to interrupt_entry() tip-bot for Dominik Brodowski
2018-02-21 17:00   ` tip-bot for Dominik Brodowski
2018-02-20 21:01 ` [RFC PATCH v3 6/6] x86/entry/64: open-code switch_to_thread_stack Dominik Brodowski
2018-02-21 10:48   ` [tip:x86/pti] x86/entry/64: Open-code switch_to_thread_stack() tip-bot for Dominik Brodowski
2018-02-21 17:01   ` tip-bot for Dominik Brodowski

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