linux-kernel - [PATCH] x86/process: remove set but not used varibles 'prev' and 'next'

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Date:   Fri, 13 Dec 2019 20:12:53 +0800
From:   yu kuai <yukuai3@...wei.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>, <luto@...nel.org>, <riel@...riel.com>,
        <alexander.h.duyck@...ux.intel.com>, <mtosatti@...hat.com>
CC:     <yukuai3@...wei.com>, <zhengbin13@...wei.com>,
        <yi.zhang@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/process: remove set but not used varibles 'prev' and 'next'

Fixes gcc '-Wunused-but-set-variable' warning:

arch/x86/kernel/process.c: In function ‘__switch_to_xtra’:
arch/x86/kernel/process.c:618:31: warning: variable ‘next’ set
but not used [-Wunused-but-set-variable]
arch/x86/kernel/process.c:618:24: warning: variable ‘prev’ set
but not used [-Wunused-but-set-variable]

They are never used, and so can be removed.

Signed-off-by: yu kuai <yukuai3@...wei.com>
---
 arch/x86/kernel/process.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 61e93a318983..839b5244e3b7 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -615,12 +615,8 @@ void speculation_ctrl_update_current(void)
 
 void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p)
 {
-	struct thread_struct *prev, *next;
 	unsigned long tifp, tifn;
 
-	prev = &prev_p->thread;
-	next = &next_p->thread;
-
 	tifn = READ_ONCE(task_thread_info(next_p)->flags);
 	tifp = READ_ONCE(task_thread_info(prev_p)->flags);
 
-- 
2.17.2