Messages in this thread | | | Date | Thu, 5 Jun 2008 07:39:10 -0500 | From | Jack Steiner <> | Subject | Re: [PATCH] x86: fix compile warning in io_apic_{32,64}.c |
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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
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