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x86/apic: Simplify X2APIC ID validation

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Currently, x2apic_max_apicid==0 means that there is no max APIC id limit.
But, this means that 0 needs to be special-cased.

Designate UINT_MAX to mean unlimited so that a plain old less than or equal
compare works and there is no special-casing.  Replace the 0 initialization
with UINT_MAX.

[ dhansen: muck with changelog ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)
This commit is contained in:
Thomas Gleixner 2023-08-08 15:04:10 -07:00 committed by Dave Hansen
parent d92e5e7cf5
commit a9d608c22a
1 changed files with 2 additions and 5 deletions
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7
arch/x86/kernel/apic/x2apic_phys.c
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@ -8,7 +8,7 @@
int x2apic_phys;
static struct apic apic_x2apic_phys;
static u32 x2apic_max_apicid __ro_after_init;
static u32 x2apic_max_apicid __ro_after_init = UINT_MAX;
void __init x2apic_set_max_apicid(u32 apicid)
{
@ -125,10 +125,7 @@ static int x2apic_phys_probe(void)
/* Common x2apic functions, also used by x2apic_cluster */
int x2apic_apic_id_valid(u32 apicid)
{
if (x2apic_max_apicid && apicid > x2apic_max_apicid)
return 0;
return 1;
return apicid <= x2apic_max_apicid;
}
unsigned int x2apic_get_apic_id(unsigned long id)