[tip:x86/cleanups] x86/kexec: Make variable static and config dependent

From: tip-bot for Tiezhu Yang
Date: Wed Jun 26 2019 - 10:08:23 EST

Commit-ID: 53b7607382b0b99d6ae1ef5b1b0fa042b00ac7f4
Gitweb: https://git.kernel.org/tip/53b7607382b0b99d6ae1ef5b1b0fa042b00ac7f4
Author: Tiezhu Yang <kernelpatch@xxxxxxx>
AuthorDate: Mon, 24 Jun 2019 12:41:18 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 26 Jun 2019 16:02:45 +0200

x86/kexec: Make variable static and config dependent

The following sparse warning is emitted:

warning: symbol 'crash_zero_bytes' was not declared. Should it be static?

The variable is only used in this compilation unit, but it is also only
used when CONFIG_KEXEC_FILE is enabled. Just making it static would result
in a 'defined but not used' warning for CONFIG_KEXEC_FILE=n.

Make it static and move it into the existing CONFIG_KEXEC_FILE section.

[ tglx: Massaged changelog and moved it into the existing ifdef ]

Fixes: dd5f726076cc ("kexec: support for kexec on panic using new system call")
Signed-off-by: Tiezhu Yang <kernelpatch@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Dave Young <dyoung@xxxxxxxxxx>
Cc: bp@xxxxxxxxx
Cc: hpa@xxxxxxxxx
Cc: kexec@xxxxxxxxxxxxxxxxxxx
Cc: vgoyal@xxxxxxxxxx
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/117ef0c6.3d30.16b87c9cfbf.Coremail.kernelpatch@xxxxxxx
arch/x86/kernel/crash.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 576b2e1bfc12..27157d66f807 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -56,7 +56,6 @@ struct crash_memmap_data {
crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss = NULL;
-unsigned long crash_zero_bytes;

static inline void cpu_crash_vmclear_loaded_vmcss(void)
@@ -181,6 +180,9 @@ void native_machine_crash_shutdown(struct pt_regs *regs)

+static unsigned long crash_zero_bytes;
static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
unsigned int *nr_ranges = arg;