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| author | Baoquan He <bhe@redhat.com> | 2018-02-14 13:46:52 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-17 11:47:44 +0100 |
| commit | 3c9e76dbea004b2c7c3ce872022ceaf5ff0dae79 (patch) | |
| tree | 122494ebb3690760398f34531e90703a771ab217 /arch/x86/kernel/machine_kexec_32.c | |
| parent | ce279cdc04aafd5c41ae49f941ee2c3342e35e3e (diff) | |
| download | linux-3c9e76dbea004b2c7c3ce872022ceaf5ff0dae79.tar.bz2 | |
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 <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/20180214054656.3780-3-bhe@redhat.com
[ Rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/machine_kexec_32.c')
| -rw-r--r-- | arch/x86/kernel/machine_kexec_32.c | 3 |
1 files changed, 2 insertions, 1 deletions
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 } |