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x86/apic: Split out restore_boot_irq_mode() from disable_IO_APIC()

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This is a preparation patch. Split out the code which restores boot
irq mode from disable_IO_APIC() into the new restore_boot_irq_mode()
function.

No functional changes.

Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: douly.fnst@cn.fujitsu.com
Cc: joro@8bytes.org
Cc: prarit@redhat.com
Cc: uobergfe@redhat.com
Link: http://lkml.kernel.org/r/20180214054656.3780-2-bhe@redhat.com
[ Build fix for !CONFIG_IO_APIC and rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Baoquan He 2018-02-14 13:46:51 +08:00 committed by Ingo Molnar
parent b753a2b79a
commit ce279cdc04
2 changed files with 7 additions and 0 deletions
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2
arch/x86/include/asm/io_apic.h
View File

@ -193,6 +193,7 @@ static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
extern void setup_IO_APIC(void);
extern void enable_IO_APIC(void);
extern void disable_IO_APIC(void);
extern void restore_boot_irq_mode(void);
extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
extern void print_IO_APICs(void);
#else /* !CONFIG_X86_IO_APIC */
@ -232,6 +233,7 @@ static inline void io_apic_init_mappings(void) { }
static inline void setup_IO_APIC(void) { }
static inline void enable_IO_APIC(void) { }
static inline void restore_boot_irq_mode(void) { }
#endif

5
arch/x86/kernel/apic/io_apic.c
View File

@ -1448,6 +1448,11 @@ void disable_IO_APIC(void)
*/
clear_IO_APIC();
restore_boot_irq_mode();
}
void restore_boot_irq_mode(void)
{
if (!nr_legacy_irqs())
return;