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From: Yunfeng Ye <yeyunfeng@huawei.com>
To: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
	<hpa@zytor.com>, <x86@kernel.org>, <luto@kernel.org>,
	<riel@surriel.com>, <dave.hansen@intel.com>,
	<yeyunfeng@huawei.com>, <longman@redhat.com>,
	<mtosatti@redhat.com>, <linux-kernel@vger.kernel.org>,
	"hushiyuan@huawei.com" <hushiyuan@huawei.com>,
	"linfeilong@huawei.com" <linfeilong@huawei.com>
Subject: [PATCH] x86/process: remove unused variable in __switch_to_xtra()
Date: Tue, 17 Dec 2019 20:09:08 +0800	[thread overview]
Message-ID: <0efac42a-1631-d93d-d8a2-e6cf65cdf16b@huawei.com> (raw)

After the commit ecc7e37d4dad ("x86/io: Speedup schedule out of I/O
bitmap user") and commit 22fe5b0439dd ("x86/ioperm: Move TSS bitmap
update to exit to user work"), warning is found:

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]
  struct thread_struct *prev, *next;
                               ^~~~
arch/x86/kernel/process.c:618:24: warning: variable ‘prev’ set but not
used [-Wunused-but-set-variable]
  struct thread_struct *prev, *next;
                        ^~~~
Fix this by removing the unused variable @prev and @next;

Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.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);

-- 
2.7.4


             reply	other threads:[~2019-12-17 12:10 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-17 12:09 Yunfeng Ye [this message]
2019-12-17 12:29 ` [PATCH] x86/process: remove unused variable in __switch_to_xtra() Borislav Petkov
2019-12-17 12:30   ` Yunfeng Ye

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