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| author | Chunyu Hu <chuhu@redhat.com> | 2017-11-27 22:21:39 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-14 09:52:53 +0100 |
| commit | e7bb5cf984ba767bc7badbb4f2bead35b88783d6 (patch) | |
| tree | 2c0fed939385cbbe5b316a13bbbd6804b0fbf7bf /arch | |
| parent | 70feeaaabf4fabf78812d33facd7f8f993b33011 (diff) | |
| download | linux-stable-e7bb5cf984ba767bc7badbb4f2bead35b88783d6.tar.gz linux-stable-e7bb5cf984ba767bc7badbb4f2bead35b88783d6.tar.bz2 linux-stable-e7bb5cf984ba767bc7badbb4f2bead35b88783d6.zip | |
x86/idt: Load idt early in start_secondary
commit 55d2d0ad2fb4325f615d1950486fbc5e6fba1769 upstream.
On a secondary, idt is first loaded in cpu_init() with load_current_idt(),
i.e. no exceptions can be handled before that point.
The conversion of WARN() to use UD requires the IDT being loaded earlier as
any warning between start_secondary() and load_curren_idt() in cpu_init()
will result in an unhandled @UD exception and therefore fail the bringup of
the CPU.
Install the IDT handlers right in start_secondary() before calling cpu_init().
[ tglx: Massaged changelog ]
Fixes: 9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: peterz@infradead.org
Cc: bp@alien8.de
Cc: rostedt@goodmis.org
Cc: luto@kernel.org
Link: https://lkml.kernel.org/r/1511792499-4073-1-git-send-email-chuhu@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 65a0ccdc3050..5e0453f18a57 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -239,7 +239,7 @@ static void notrace start_secondary(void *unused) load_cr3(swapper_pg_dir); __flush_tlb_all(); #endif - + load_current_idt(); cpu_init(); x86_cpuinit.early_percpu_clock_init(); preempt_disable(); |