From: Dominik Brodowski <linux@dominikbrodowski.net>
To: linux-kernel@vger.kernel.org, mingo@kernel.org, x86@kernel.org
Cc: torvalds@linux-foundation.org, luto@kernel.org,
ak@linux.intel.com, tglx@linutronix.de, dan.j.williams@intel.com
Subject: [RFC PATCH 1/4] x86/entry/64: move PUSH_AND_CLEAR_REGS from interrupt macro to helper function
Date: Wed, 14 Feb 2018 19:21:10 +0100 [thread overview]
Message-ID: <20180214182113.27247-2-linux@dominikbrodowski.net> (raw)
In-Reply-To: <20180214182113.27247-1-linux@dominikbrodowski.net>
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
20987 0 0 20987 51fb entry_64.o-orig
17905 0 0 17905 45f1 entry_64.o
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
arch/x86/entry/entry_64.S | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 5d9cb0f037e4..de8a0da0d347 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -526,6 +526,15 @@ END(irq_entries_start)
*
* Entry runs with interrupts off.
*/
+ENTRY(interrupt_helper)
+ UNWIND_HINT_FUNC
+ cld
+
+ PUSH_AND_CLEAR_REGS save_ret=1
+ ENCODE_FRAME_POINTER 8
+
+ ret
+END(interrupt_helper)
/* 0(%rsp): ~(interrupt number) */
.macro interrupt func
@@ -537,8 +546,7 @@ END(irq_entries_start)
call switch_to_thread_stack
1:
- PUSH_AND_CLEAR_REGS
- ENCODE_FRAME_POINTER
+ call interrupt_helper
testb $3, CS(%rsp)
jz 1f
--
2.16.1
next prev parent reply other threads:[~2018-02-14 18:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-14 18:21 [RFC PATCH 0/4] x86/entry/64: interrupt entry size reduction Dominik Brodowski
2018-02-14 18:21 ` Dominik Brodowski [this message]
2018-02-14 18:21 ` [RFC PATCH 2/4] x86/entry/64: move ENTER_IRQ_STACK from interrupt macro to helper function Dominik Brodowski
2018-02-14 18:36 ` Brian Gerst
2018-02-15 0:17 ` Andy Lutomirski
2018-02-15 0:48 ` Brian Gerst
2018-02-15 3:11 ` Andy Lutomirski
2018-02-15 13:45 ` Brian Gerst
2018-02-14 18:21 ` [RFC PATCH 3/4] x86/entry/64: move switch_to_thread_stack to interrupt " Dominik Brodowski
2018-02-14 18:57 ` Brian Gerst
2018-02-14 19:06 ` Dominik Brodowski
2018-02-14 19:27 ` Brian Gerst
2018-02-14 18:21 ` [RFC PATCH 4/4] x86/entry/64: remove interrupt macro Dominik Brodowski
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