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To: Andrew Morton <>
Subject: [PATCH] init/calibrate.c - provide proper prototype.
Date: Tue, 29 Jan 2019 03:35:38 -0500
Message-ID: <> (raw)

Sparse issues a warning:

  CHECK   init/calibrate.c
init/calibrate.c:271:28: warning: symbol 'calibration_delay_done' was not declared. Should it be static?

The actual issue is that it's a __weak symbol that archs can override (in fact,
ARM does so), but no prototype is provided. Let's provide one to prevent

Signed-off-by: Valdis Kletnieks <>

diff --git a/include/linux/delay.h b/include/linux/delay.h
index b78bab4395d8..8e6828094c1e 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -55,6 +55,7 @@ static inline void ndelay(unsigned long x)
 extern unsigned long lpj_fine;
 void calibrate_delay(void);
+void __attribute__((weak)) calibration_delay_done(void);
 void msleep(unsigned int msecs);
 unsigned long msleep_interruptible(unsigned int msecs);
 void usleep_range(unsigned long min, unsigned long max);

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