Commit-ID: d632044a53571267034f430a5433f048ff8168da Gitweb: https://git.kernel.org/tip/d632044a53571267034f430a5433f048ff8168da Author: Chunyu Hu <chuhu@xxxxxxxxxx> AuthorDate: Mon, 27 Nov 2017 22:21:39 +0800 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Tue, 28 Nov 2017 00:28:56 +0100 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 ] Signed-off-by: Chunyu Hu <chuhu@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: peterz@xxxxxxxxxxxxx Cc: bp@xxxxxxxxx Cc: rostedt@xxxxxxxxxxx Cc: luto@xxxxxxxxxx Link: https://lkml.kernel.org/r/1511792499-4073-1-git-send-email-chuhu@xxxxxxxxxx --- arch/x86/kernel/smpboot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 3d01df7..05a97d5 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(); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html