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authorChunyu Hu <chuhu@redhat.com>2017-11-27 22:21:39 +0800
committerThomas Gleixner <tglx@linutronix.de>2017-11-28 08:15:40 +0100
commit55d2d0ad2fb4325f615d1950486fbc5e6fba1769 (patch)
tree9f422bd397bd85dcde5e7b7ed332881d29f6c35a /arch/x86
parent42b3a4cb5609de757f5445fcad18945ba9239a07 (diff)
downloadlinux-55d2d0ad2fb4325f615d1950486fbc5e6fba1769.tar.bz2
x86/idt: Load idt early in start_secondary
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: stable@vger.kernel.org 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
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/smpboot.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 3d01df7d7cf6..05a97d5fe298 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -237,7 +237,7 @@ 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();