From: Qian Cai <cai@lca.pw>
To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de
Cc: hpa@zytor.com, x86@kernel.org, linux-kernel@vger.kernel.org,
Qian Cai <cai@lca.pw>
Subject: [PATCH] x86/apic: silence compiler -Wtype-limits warnings
Date: Mon, 8 Jul 2019 17:36:45 -0400 [thread overview]
Message-ID: <1562621805-24789-1-git-send-email-cai@lca.pw> (raw)
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" an "int"
which is a simpler fix than adding more checks in apic_printk().
Signed-off-by: Qian Cai <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 1340fa53b575..2e599384abd8 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 85be316665b4..1e49de432c4c 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -183,7 +183,7 @@ static __init int setup_apicpmtimer(char *s)
/*
* Debug level, exported for io_apic.c
*/
-unsigned int apic_verbosity;
+int apic_verbosity;
int pic_mode;
--
1.8.3.1
next reply other threads:[~2019-07-08 21:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 21:36 Qian Cai [this message]
2019-07-16 21:20 ` [tip:x86/urgent] x86/apic: Silence -Wtype-limits compiler warnings tip-bot for Qian Cai
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