* [PATCH] x86: fix compile warning in io_apic_{32,64}.c
@ 2008-06-05 12:05 Andreas Herrmann
2008-06-05 12:39 ` Jack Steiner
2008-06-10 10:21 ` Ingo Molnar
0 siblings, 2 replies; 4+ messages in thread
From: Andreas Herrmann @ 2008-06-05 12:05 UTC (permalink / raw)
To: Ingo Molnar, Thomas Gleixner, H. Peter Anvin; +Cc: Jack Steiner, linux-kernel
Commit 05f2d12c3563dea8c81b301f9f3cf7919af23b13
(x86: change GET_APIC_ID() from an inline function to an out-of-line function)
introduced a compile warning
arch/x86/kernel/io_apic_64.c: In function 'print_local_APIC':
arch/x86/kernel/io_apic_64.c:1152: warning: 'v' is used uninitialized in this function
in some debug code -- which is not enabled by default.
This patch reverts the code changes in print_local_APIC.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
--
diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index a40d54f..9a3446f 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -1489,8 +1489,8 @@ void /*__init*/ print_local_APIC(void * dummy)
printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
smp_processor_id(), hard_smp_processor_id());
- printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v,
- GET_APIC_ID(read_apic_id()));
+ v = apic_read(APIC_ID);
+ printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
v = apic_read(APIC_LVR);
printk(KERN_INFO "... APIC VERSION: %08x\n", v);
ver = GET_APIC_VERSION(v);
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index ef1a8df..59ed52c 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -1077,7 +1077,8 @@ void __apicdebuginit print_local_APIC(void * dummy)
printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
smp_processor_id(), hard_smp_processor_id());
- printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(read_apic_id()));
+ v = apic_read(APIC_ID);
+ printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
v = apic_read(APIC_LVR);
printk(KERN_INFO "... APIC VERSION: %08x\n", v);
ver = GET_APIC_VERSION(v);
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] x86: fix compile warning in io_apic_{32,64}.c
2008-06-05 12:05 [PATCH] x86: fix compile warning in io_apic_{32,64}.c Andreas Herrmann
@ 2008-06-05 12:39 ` Jack Steiner
2008-06-05 14:35 ` Andreas Herrmann
2008-06-10 10:21 ` Ingo Molnar
1 sibling, 1 reply; 4+ messages in thread
From: Jack Steiner @ 2008-06-05 12:39 UTC (permalink / raw)
To: Andreas Herrmann
Cc: Ingo Molnar, Thomas Gleixner, H. Peter Anvin, linux-kernel
On Thu, Jun 05, 2008 at 02:05:57PM +0200, Andreas Herrmann wrote:
> Commit 05f2d12c3563dea8c81b301f9f3cf7919af23b13
> (x86: change GET_APIC_ID() from an inline function to an out-of-line function)
>
> introduced a compile warning
>
> arch/x86/kernel/io_apic_64.c: In function 'print_local_APIC':
> arch/x86/kernel/io_apic_64.c:1152: warning: 'v' is used uninitialized in this function
>
> in some debug code -- which is not enabled by default.
> This patch reverts the code changes in print_local_APIC.
>
> Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
>
> --
> diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
> index a40d54f..9a3446f 100644
> --- a/arch/x86/kernel/io_apic_32.c
> +++ b/arch/x86/kernel/io_apic_32.c
> @@ -1489,8 +1489,8 @@ void /*__init*/ print_local_APIC(void * dummy)
>
> printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
> smp_processor_id(), hard_smp_processor_id());
> - printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v,
> - GET_APIC_ID(read_apic_id()));
> + v = apic_read(APIC_ID);
> + printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
> v = apic_read(APIC_LVR);
> printk(KERN_INFO "... APIC VERSION: %08x\n", v);
> ver = GET_APIC_VERSION(v);
> diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
> index ef1a8df..59ed52c 100644
> --- a/arch/x86/kernel/io_apic_64.c
> +++ b/arch/x86/kernel/io_apic_64.c
> @@ -1077,7 +1077,8 @@ void __apicdebuginit print_local_APIC(void * dummy)
>
> printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
> smp_processor_id(), hard_smp_processor_id());
> - printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(read_apic_id()));
> + v = apic_read(APIC_ID);
I don't think this work on UV systems. Because of processor limitations, not
all of the APICID bits are contained in the hardware APIC_ID register. See
read_apic_id() in arch/x86/kernel/genapic_64.c.
I have not seen the compiler warning. What tree/options cause the error???
> + printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
> v = apic_read(APIC_LVR);
> printk(KERN_INFO "... APIC VERSION: %08x\n", v);
> ver = GET_APIC_VERSION(v);
>
>
>
--- jack
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] x86: fix compile warning in io_apic_{32,64}.c
2008-06-05 12:39 ` Jack Steiner
@ 2008-06-05 14:35 ` Andreas Herrmann
0 siblings, 0 replies; 4+ messages in thread
From: Andreas Herrmann @ 2008-06-05 14:35 UTC (permalink / raw)
To: Jack Steiner; +Cc: Ingo Molnar, Thomas Gleixner, H. Peter Anvin, linux-kernel
On Thu, Jun 05, 2008 at 02:39:10PM +0200, Jack Steiner wrote:
> I have not seen the compiler warning. What tree/options cause the error???
Sure. It's currently dead code. I use it from time to time for debugging.
At least you have to do something like
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index ef1a8df..ddfdabd 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -1045,7 +1045,6 @@ void __apicdebuginit print_IO_APIC(void)
return;
}
-#if 0
static __apicdebuginit void print_APIC_bitfield (int base)
{
@@ -1181,7 +1180,6 @@ void __apicdebuginit print_PIC(void)
printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
}
-#endif /* 0 */
void __init enable_IO_APIC(void)
{
to compile it.
> I don't think this work on UV systems. Because of processor limitations, not
> all of the APICID bits are contained in the hardware APIC_ID register. See
> read_apic_id() in arch/x86/kernel/genapic_64.c.
I am not that familar with UV. So can't really comment on that.
But then it seems that the proper adaption for print_local_APIC to avoid the warning is
---
[PATCH] x86: fix compile warning in io_apic_{32,64}.c
Commit 05f2d12c3563dea8c81b301f9f3cf7919af23b13
(x86: change GET_APIC_ID() from an inline function to an out-of-line function)
introduced a compile warning:
arch/x86/kernel/io_apic_64.c: In function 'print_local_APIC':
arch/x86/kernel/io_apic_64.c:1152: warning: 'v' is used uninitialized in this function
in some debug code -- which is disabled by default.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
--
diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index a40d54f..4fbf656 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -1489,6 +1489,7 @@ void /*__init*/ print_local_APIC(void * dummy)
printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
smp_processor_id(), hard_smp_processor_id());
+ v = apic_read(APIC_ID);
printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v,
GET_APIC_ID(read_apic_id()));
v = apic_read(APIC_LVR);
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index ef1a8df..c7c6b00 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -1077,6 +1077,7 @@ void __apicdebuginit print_local_APIC(void * dummy)
printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
smp_processor_id(), hard_smp_processor_id());
+ v = apic_read(APIC_ID);
printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(read_apic_id()));
v = apic_read(APIC_LVR);
printk(KERN_INFO "... APIC VERSION: %08x\n", v);
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] x86: fix compile warning in io_apic_{32,64}.c
2008-06-05 12:05 [PATCH] x86: fix compile warning in io_apic_{32,64}.c Andreas Herrmann
2008-06-05 12:39 ` Jack Steiner
@ 2008-06-10 10:21 ` Ingo Molnar
1 sibling, 0 replies; 4+ messages in thread
From: Ingo Molnar @ 2008-06-10 10:21 UTC (permalink / raw)
To: Andreas Herrmann
Cc: Thomas Gleixner, H. Peter Anvin, Jack Steiner, linux-kernel,
the arch/x86 maintainers
* Andreas Herrmann <andreas.herrmann3@amd.com> wrote:
> Commit 05f2d12c3563dea8c81b301f9f3cf7919af23b13
> (x86: change GET_APIC_ID() from an inline function to an out-of-line function)
>
> introduced a compile warning
>
> arch/x86/kernel/io_apic_64.c: In function 'print_local_APIC':
> arch/x86/kernel/io_apic_64.c:1152: warning: 'v' is used uninitialized in this function
>
> in some debug code -- which is not enabled by default.
> This patch reverts the code changes in print_local_APIC.
applied to tip/x86/cleanups - thanks Andreas.
Ingo
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-06-10 10:21 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2008-06-05 12:05 [PATCH] x86: fix compile warning in io_apic_{32,64}.c Andreas Herrmann
2008-06-05 12:39 ` Jack Steiner
2008-06-05 14:35 ` Andreas Herrmann
2008-06-10 10:21 ` Ingo Molnar
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox