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

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Date:   Wed, 26 Jun 2019 07:07:08 -0700
From:   tip-bot for Tiezhu Yang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, tglx@...utronix.de, dyoung@...hat.com,
        kernelpatch@....com, vgoyal@...hat.com,
        linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:x86/cleanups] x86/kexec: Make variable static and config
 dependent

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

x86/kexec: Make variable static and config dependent

The following sparse warning is emitted:

  arch/x86/kernel/crash.c:59:15:
  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@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Dave Young <dyoung@...hat.com>
Cc: bp@...en8.de
Cc: hpa@...or.com
Cc: kexec@...ts.infradead.org
Cc: vgoyal@...hat.com
Cc: Vivek Goyal <vgoyal@...hat.com>
Link: https://lkml.kernel.org/r/117ef0c6.3d30.16b87c9cfbf.Coremail.kernelpatch@126.com
---
 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;
 EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss);
-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)
 }
 
 #ifdef CONFIG_KEXEC_FILE
+
+static unsigned long crash_zero_bytes;
+
 static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
 {
 	unsigned int *nr_ranges = arg;