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Subject[PATCH v5 2/6] x86/apic: Replace disable_IO_APIC for KEXEC_JUMP
Date
Later disable_IO_APIC() will be broken down 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 commit 522e66464467 ("x86/apic: Disable I/O APIC before
shutdown of the local APIC").

While KEXEC_JUMP 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 KEXEC_JUMP
code unchanged in essence. No functional change.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
v4->v5:
Make this patch to replace disable_IO_APIC() with clear_IO_APIC
and restore_boot_irq_mode() for KEXEC_JUMP path only. This makes
patch easier to review according to Eric's suggestion..

arch/x86/include/asm/io_apic.h | 1 +
arch/x86/kernel/apic/io_apic.c | 2 +-
arch/x86/kernel/machine_kexec_32.c | 3 ++-
arch/x86/kernel/machine_kexec_64.c | 3 ++-
4 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 558d1a6a13ad..0fa95bfacb39 100644
--- 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 7b73b6b9b4b6..2d7cd2db77f5 100644
--- 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 edfede768688..4cd79d88a4ac 100644
--- 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 1f790cf9d38f..2ab14b9c1a89 100644
--- 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
}

--
2.13.6
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