Re: [PATCH -next] powerpc: kernel/time.c - cleanup warnings

在 2021/3/17 19:16, Christophe Leroy 写道:

Le 17/03/2021 à 11:34, He Ying a écrit :

quoted

We found these warnings in arch/powerpc/kernel/time.c as follows:
warning: symbol 'decrementer_max' was not declared. Should it be static?
warning: symbol 'rtc_lock' was not declared. Should it be static?
warning: symbol 'dtl_consumer' was not declared. Should it be static?

Declare 'decrementer_max' in arch/powerpc/include/asm/time.h. And 
include
proper header in which 'rtc_lock' is declared. Move 'dtl_consumer'
definition behind "include <asm/dtl.h>" because 'dtl_consumer' is 
declared
there.

Reported-by: Hulk Robot <redacted>
Signed-off-by: He Ying <redacted>
---
  arch/powerpc/include/asm/time.h | 1 +
  arch/powerpc/kernel/time.c      | 7 +++----
  2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/time.h 

b/arch/powerpc/include/asm/time.h
index 8dd3cdb25338..2cd2b50bedda 100644

--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h

@@ -22,6 +22,7 @@ extern unsigned long tb_ticks_per_jiffy;

  extern unsigned long tb_ticks_per_usec;
  extern unsigned long tb_ticks_per_sec;
  extern struct clock_event_device decrementer_clockevent;
+extern u64 decrementer_max;
      extern void generic_calibrate_decr(void);

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index b67d93a609a2..409967713ca6 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c

@@ -55,6 +55,7 @@

  #include <linux/sched/cputime.h>
  #include <linux/sched/clock.h>
  #include <linux/processor.h>
+#include <linux/mc146818rtc.h>

I don't think that's the good place. It has no link to powerpc, it is 
only by chance that it has the same name.

As rtc_lock is defined in powerpc time.c, I think you should declare 
it in powerpc asm/time.h

My first thought was the same as yours. I tried to add declaration in 
powerpc asm/time.h, but got a compiling error:

drivers/rtc/rtc-vr41xx.c:75:24: error: static declaration of ‘rtc_lock’ 
follows non-static declaration
  static DEFINE_SPINLOCK(rtc_lock);

In file included from ./arch/powerpc/include/asm/delay.h:7:0,
                  from ./arch/powerpc/include/asm/io.h:33,
                  from ./include/linux/io.h:13,
                  from drivers/rtc/rtc-vr41xx.c:11:
./arch/powerpc/include/asm/time.h:25:19: note: previous declaration of 
‘rtc_lock’ was here
  extern spinlock_t rtc_lock;

There's a conflict. Perhaps I can rename it in drivers/rtc/rtc-vr41xx.c.


But I find an existing declaration in linux/mc146818rtc.h and there's 
only one definition for 'rtc_lock' in powerpc.

There's some includes of mc146818rtc.h in powperc. I wonder they point 
to the same thing. But I'm not very sure

because the header's name looks a bit strange.

quoted

  #include <asm/trace.h>
    #include <asm/interrupt.h>

@@ -150,10 +151,6 @@ bool tb_invalid;

  u64 __cputime_usec_factor;
  EXPORT_SYMBOL(__cputime_usec_factor);
  -#ifdef CONFIG_PPC_SPLPAR
-void (*dtl_consumer)(struct dtl_entry *, u64);
-#endif
-
  static void calc_cputime_factors(void)
  {
      struct div_result res;

@@ -179,6 +176,8 @@ static inline unsigned long read_spurr(unsigned 

long tb)
    #include <asm/dtl.h>
  +void (*dtl_consumer)(struct dtl_entry *, u64);
+
  /*
   * Scan the dispatch trace log and count up the stolen time.
   * Should be called with interrupts disabled.

.