x86/apic: Split disable_IO_APIC() into two functions to fix CONFIG_KEXEC_JUMP=y

Split  following patches disable_IO_APIC() will be broken up into
clear_IO_APIC() and restore_boot_irq_mode().

These two functions will be called separately where they are needed
to fix a regression introduced by:

  522e66464467 ("x86/apic: Disable I/O APIC before shutdown of the local APIC").

While the CONFIG_KEXEC_JUMP=y code doesn't call lapic_shutdown() before jump
like kexec/kdump, so it's not impacted by commit 522e66464467.

Hence here change clear_IO_APIC() as public, and replace disable_IO_APIC()
with clear_IO_APIC() and restore_boot_irq_mode() to keep CONFIG_KEXEC_JUMP=y
code unchanged in essence. No functional change.

Signed-off-by: Baoquan He <[email protected]>
Reviewed-by: Eric W. Biederman <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
[ Rewrote the changelog. ]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 4e3bb13e02a6c2311ecb830c54d8aa685d6f36ad..2ae1b424c1bd685c46e60eea72b043c96bce586d 100644 (file)
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -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 clear_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);

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 7b73b6b9b4b6842be361ef8dbf63f216e2be4f22..2d7cd2db77f510b4a23293e4c4b1584a57881a77 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -587,7 +587,7 @@ static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
                       mpc_ioapic_id(apic), pin);
 }
 
-static void clear_IO_APIC (void)
+void clear_IO_APIC (void)
 {
        int apic, pin;
 

diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index edfede76868870e4cf86fed553377fd6bd0cac06..4cd79d88a4ac510d519928531bab7544717c6c7e 100644 (file)
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -199,7 +199,8 @@ void machine_kexec(struct kimage *image)
                 * one form or other. kexec jump path also need
                 * one.
                 */
-               disable_IO_APIC();
+               clear_IO_APIC();
+               restore_boot_irq_mode();
 #endif
        }
 

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 1f790cf9d38fe0e10e46eaf9b5bef945d25a9370..2ab14b9c1a89bad70d770bda3efad85b70e8d1df 100644 (file)
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -297,7 +297,8 @@ void machine_kexec(struct kimage *image)
                 * one form or other. kexec jump path also need
                 * one.
                 */
-               disable_IO_APIC();
+               clear_IO_APIC();
+               restore_boot_irq_mode();
 #endif
        }