Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 5 Apr 2019 06:13:19 -0700
From:   tip-bot for Valentin Schneider <tipbot@zytor.com>
Message-ID: <tip-b5b447b6b4e899e0978b95cb42d272978f8c7b4d@git.kernel.org>
Cc:     hpa@zytor.com, bp@alien8.de, mingo@kernel.org,
        linux-kernel@vger.kernel.org, luto@kernel.org, tglx@linutronix.de,
        valentin.schneider@arm.com
Reply-To: hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org,
          tglx@linutronix.de, bp@alien8.de, mingo@kernel.org,
          valentin.schneider@arm.com
In-Reply-To: <20190311224752.8337-14-valentin.schneider@arm.com>
References: <20190311224752.8337-14-valentin.schneider@arm.com>
To:     linux-tip-commits@vger.kernel.org
Subject: [tip:x86/entry] x86/entry: Remove unneeded need_resched() loop
Git-Commit-ID: b5b447b6b4e899e0978b95cb42d272978f8c7b4d
Robot-ID: <tip-bot.git.kernel.org>
Robot-Unsubscribe: Contact <mailto:hpa@kernel.org> to get blacklisted from
 these emails
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8
Content-Disposition: inline
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Commit-ID:  b5b447b6b4e899e0978b95cb42d272978f8c7b4d
Gitweb:     https://git.kernel.org/tip/b5b447b6b4e899e0978b95cb42d272978f8c7b4d
Author:     Valentin Schneider <valentin.schneider@arm.com>
AuthorDate: Mon, 11 Mar 2019 22:47:51 +0000
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 5 Apr 2019 15:08:03 +0200

x86/entry: Remove unneeded need_resched() loop

Since the enabling and disabling of IRQs within preempt_schedule_irq() is
contained in a need_resched() loop, there is no need for the outer
architecture specific loop.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20190311224752.8337-14-valentin.schneider@arm.com

---
 arch/x86/entry/entry_32.S | 3 +--
 arch/x86/entry/entry_64.S | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index d309f30cf7af..b1856fe9decf 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -766,13 +766,12 @@ END(ret_from_exception)
 #ifdef CONFIG_PREEMPT
 ENTRY(resume_kernel)
 	DISABLE_INTERRUPTS(CLBR_ANY)
-.Lneed_resched:
 	cmpl	$0, PER_CPU_VAR(__preempt_count)
 	jnz	restore_all_kernel
 	testl	$X86_EFLAGS_IF, PT_EFLAGS(%esp)	# interrupts off (exception path) ?
 	jz	restore_all_kernel
 	call	preempt_schedule_irq
-	jmp	.Lneed_resched
+	jmp	restore_all_kernel
 END(resume_kernel)
 #endif
 
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 1f0efdb7b629..e7e270603fe7 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -645,10 +645,9 @@ retint_kernel:
 	/* Check if we need preemption */
 	btl	$9, EFLAGS(%rsp)		/* were interrupts off? */
 	jnc	1f
-0:	cmpl	$0, PER_CPU_VAR(__preempt_count)
+	cmpl	$0, PER_CPU_VAR(__preempt_count)
 	jnz	1f
 	call	preempt_schedule_irq
-	jmp	0b
 1:
 #endif
 	/*