ACPI: processor: Refactor arch_acpi_set_pdc_bits()

The capabilities buffer modified by the arch_acpi_set_pdc_bits() is not
_PDC-specific, as it can be used by _OSC too.

Change the name of that function to better reflect its independence from
_PDC and make it take the capabilities buffer address as the argument
directly, without any offset, as _OSC and _PDC use different capabilities
buffer offsets.

No intentional functional impact.
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/ia64/include/asm/acpi.h

@@ -69,9 +69,9 @@ extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
 #endif
 
 static inline bool arch_has_acpi_pdc(void) { return true; }
-static inline void arch_acpi_set_pdc_bits(u32 *buf)
+static inline void arch_acpi_set_proc_cap_bits(u32 *cap)
 {
-	buf[2] |= ACPI_PDC_EST_CAPABILITY_SMP;
+	*cap |= ACPI_PDC_EST_CAPABILITY_SMP;
 }
 
 #ifdef CONFIG_ACPI_NUMA

arch/x86/include/asm/acpi.h

@@ -100,23 +100,23 @@ static inline bool arch_has_acpi_pdc(void)
 		c->x86_vendor == X86_VENDOR_CENTAUR);
 }
 
-static inline void arch_acpi_set_pdc_bits(u32 *buf)
+static inline void arch_acpi_set_proc_cap_bits(u32 *cap)
 {
 	struct cpuinfo_x86 *c = &cpu_data(0);
 
-	buf[2] |= ACPI_PDC_C_CAPABILITY_SMP;
+	*cap |= ACPI_PDC_C_CAPABILITY_SMP;
 
 	if (cpu_has(c, X86_FEATURE_EST))
-		buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
+		*cap |= ACPI_PDC_EST_CAPABILITY_SWSMP;
 
 	if (cpu_has(c, X86_FEATURE_ACPI))
-		buf[2] |= ACPI_PDC_T_FFH;
+		*cap |= ACPI_PDC_T_FFH;
 
 	/*
 	 * If mwait/monitor is unsupported, C2/C3_FFH will be disabled
 	 */
 	if (!cpu_has(c, X86_FEATURE_MWAIT))
-		buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
+		*cap &= ~(ACPI_PDC_C_C2C3_FFH);
 }
 
 static inline bool acpi_has_cpu_in_madt(void)

drivers/acpi/processor_pdc.c

@@ -24,7 +24,7 @@ static void acpi_set_pdc_bits(u32 *buf)
 	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
 
 	/* Twiddle arch-specific bits needed for _PDC */
-	arch_acpi_set_pdc_bits(buf);
+	arch_acpi_set_proc_cap_bits(&buf[2]);
 }
 
 static struct acpi_object_list *acpi_processor_alloc_pdc(void)