linux-kernel - [tip:x86/asm] x86/asm/entry/64: Remove pointless jump to irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Sun, 7 Jun 2015 01:30:38 -0700
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	luto@...capital.net, brgerst@...il.com, bp@...en8.de,
	dvlasenk@...hat.com, peterz@...radead.org,
	torvalds@...ux-foundation.org, luto@...nel.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:x86/asm] x86/asm/entry/64:
  Remove pointless jump to irq_return

Commit-ID:  5ca6f70f387b4f82903037cc3c5488e2c97dcdbc
Gitweb:     http://git.kernel.org/tip/5ca6f70f387b4f82903037cc3c5488e2c97dcdbc
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Thu, 4 Jun 2015 13:24:29 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 5 Jun 2015 12:42:41 +0200

x86/asm/entry/64: Remove pointless jump to irq_return

INTERRUPT_RETURN turns into a jmp instruction.  There's no need
for extra indirection.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: <linux-kernel@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/2f2318653dbad284a59311f13f08cea71298fd7c.1433449436.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/entry/entry_64.S | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index f7380ea..3177066 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -663,8 +663,6 @@ retint_kernel:
 restore_c_regs_and_iret:
 	RESTORE_C_REGS
 	REMOVE_PT_GPREGS_FROM_STACK 8
-
-irq_return:
 	INTERRUPT_RETURN
 
 ENTRY(native_iret)
@@ -1432,7 +1430,7 @@ nmi_restore:
 
 	/* Clear the NMI executing stack variable */
 	movq $0, 5*8(%rsp)
-	jmp irq_return
+	INTERRUPT_RETURN
 END(nmi)
 
 ENTRY(ignore_sysret)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/