linux-kernel - [tip:x86/urgent] x86/apic: Silence -Wtype-limits compiler warnings

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Message-ID: <tip-ec6335586953b0df32f83ef696002063090c7aef@git.kernel.org>
Date:   Tue, 16 Jul 2019 14:20:38 -0700
From:   tip-bot for Qian Cai <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, hpa@...or.com, cai@....pw, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip:x86/urgent] x86/apic: Silence -Wtype-limits compiler warnings

Commit-ID:  ec6335586953b0df32f83ef696002063090c7aef
Gitweb:     https://git.kernel.org/tip/ec6335586953b0df32f83ef696002063090c7aef
Author:     Qian Cai <cai@....pw>
AuthorDate: Mon, 8 Jul 2019 17:36:45 -0400
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 16 Jul 2019 23:13:48 +0200

x86/apic: Silence -Wtype-limits compiler warnings

There are many compiler warnings like this,

In file included from ./arch/x86/include/asm/smp.h:13,
                 from ./arch/x86/include/asm/mmzone_64.h:11,
                 from ./arch/x86/include/asm/mmzone.h:5,
                 from ./include/linux/mmzone.h:969,
                 from ./include/linux/gfp.h:6,
                 from ./include/linux/mm.h:10,
                 from arch/x86/kernel/apic/io_apic.c:34:
arch/x86/kernel/apic/io_apic.c: In function 'check_timer':
./arch/x86/include/asm/apic.h:37:11: warning: comparison of unsigned
expression >= 0 is always true [-Wtype-limits]
   if ((v) <= apic_verbosity) \
           ^~
arch/x86/kernel/apic/io_apic.c:2160:2: note: in expansion of macro
'apic_printk'
  apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
  ^~~~~~~~~~~
./arch/x86/include/asm/apic.h:37:11: warning: comparison of unsigned
expression >= 0 is always true [-Wtype-limits]
   if ((v) <= apic_verbosity) \
           ^~
arch/x86/kernel/apic/io_apic.c:2207:4: note: in expansion of macro
'apic_printk'
    apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
    ^~~~~~~~~~~

APIC_QUIET is 0, so silence them by making apic_verbosity type int.

Signed-off-by: Qian Cai <cai@....pw>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/1562621805-24789-1-git-send-email-cai@lca.pw

---
 arch/x86/include/asm/apic.h | 2 +-
 arch/x86/kernel/apic/apic.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 050e5f9ebf81..e647aa095867 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -49,7 +49,7 @@ static inline void generic_apic_probe(void)
 
 #ifdef CONFIG_X86_LOCAL_APIC
 
-extern unsigned int apic_verbosity;
+extern int apic_verbosity;
 extern int local_apic_timer_c2_ok;
 
 extern int disable_apic;
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 1bd91cb7b320..f5291362da1a 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -183,7 +183,7 @@ EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
 /*
  * Debug level, exported for io_apic.c
  */
-unsigned int apic_verbosity;
+int apic_verbosity;
 
 int pic_mode;