linux-kernel - [PATCH] x86/tsc: Fix -Wmissing-prototypes warning for calibrate_delay_is

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Date:   Tue, 13 Nov 2018 12:40:05 +0800
From:   Yi Wang <wang.yi59@....com.cn>
To:     tglx@...utronix.de
Cc:     mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        pasha.tatashin@...cle.com, wang.yi59@....com.cn,
        rajvi.jingar@...el.com, linux-kernel@...r.kernel.org,
        zhong.weidong@....com.cn, bp@...e.de
Subject: [PATCH] x86/tsc: Fix -Wmissing-prototypes warning for calibrate_delay_is_known()

We get a warning when building kernel with W=1:
arch/x86/kernel/tsc.c:1497:15: warning: no previous prototype for ‘calibrate_delay_is_known’ [-Wmissing-prototypes]
 unsigned long calibrate_delay_is_known(void)
               ^

Add the missing declaration in head file to fix this.

Signed-off-by: Yi Wang <wang.yi59@....com.cn>
---
 arch/x86/include/asm/tsc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index eb5bbfe..8a0c25c 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -35,6 +35,7 @@ static inline cycles_t get_cycles(void)
 
 extern void tsc_early_init(void);
 extern void tsc_init(void);
+extern unsigned long calibrate_delay_is_known(void);
 extern void mark_tsc_unstable(char *reason);
 extern int unsynchronized_tsc(void);
 extern int check_tsc_unstable(void);
-- 
1.8.3.1