[PATCH] powerpc: define the variable 'uaccess_flush' as static

[heying (H)]

> I think this is the case also for entry_flush. compiling with W=1 will tell you more.

When I use these commands:

make allmodconfig ARCH=powerpc CROSS_COMPILE=powerpc64-linux-gnu-
make C=2 arch/powerpc/kernel/setup_64.o ARCH=powerpc CROSS_COMPILE=powerpc64-linux-gnu-

I find warnings as followings:

arch/powerpc/kernel/setup_64.c:422:6: warning: symbol 
'panic_smp_self_stop' was not declared. Should it be static?
arch/powerpc/kernel/setup_64.c:951:6: warning: symbol 'rfi_flush' was 
not declared. Should it be static?
arch/powerpc/kernel/setup_64.c:952:6: warning: symbol 'entry_flush' was 
not declared. Should it be static?
arch/powerpc/kernel/setup_64.c:953:6: warning: symbol 'uaccess_flush' 
was not declared. Should it be static?

When I use the command "make W=1 arch/powerpc/kernel/setup_64.o 
ARCH=powerpc CROSS_COMPILE=powerpc64-linux-gnu-", warning becomes this:

arch/powerpc/kernel/setup_64.c:422:6: warning: no previous prototype for 
‘panic_smp_self_stop’ [-Wmissing-prototypes]
  void panic_smp_self_stop(void)
       ^~~~~~~~~~~~~~~~~~~

My sparse tool is the latest one with the version "v0.6.3". So, should I 
fix all the warnings reported by sparse?


Thanks.

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