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Commit 152bbb43 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Thomas Gleixner:
 "A set of small fixes:

   - make KGDB work again which got broken by the conversion of WARN()
     to #UD. The WARN fixup needs to run before the notifier callchain,
     otherwise KGDB tries to handle it and crashes.

   - disable KASAN in the ORC unwinder to prevent false positive KASAN
     warnings

   - prevent default mapping above 47bit when 5 level page tables are
     enabled

   - make the delay calibration optimization work correctly, which had
     the conditionals the wrong way around and was operating on data
     which was not yet updated.

   - remove the bogus X86_TRAP_BP trap init from the default IDT init
     table, which broke 32bit int3 handling by overwriting the correct
     int3 setup.

   - replace this_cpu* with boot_cpu_data access in the preemptible
     oprofile init code"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/debug: Handle warnings before the notifier chain, to fix KGDB crash
  x86/mm: Fix ELF_ET_DYN_BASE for 5-level paging
  x86/idt: Remove X86_TRAP_BP initialization in idt_setup_traps()
  x86/oprofile/ppro: Do not use __this_cpu*() in preemptible context
  x86/unwind: Disable KASAN checking in the ORC unwinder
  x86/smpboot: Make optimization of delay calibration work correctly
parents 69581c74 b8347c21

arch/x86/include/asm/elf.h

+1 −1
Original line number Diff line number Diff line
@@ -253,7 +253,7 @@ extern int force_personality32; 
 * space open for things that want to use the area for 32-bit pointers.

 */

#define ELF_ET_DYN_BASE		(mmap_is_ia32() ? 0x000400000UL : \

						  (TASK_SIZE / 3 * 2))

						  (DEFAULT_MAP_WINDOW / 3 * 2))



/* This yields a mask that user programs can use to figure out what

   instruction set this CPU supports.  This could be done in user space,

arch/x86/kernel/idt.c

+0 −2
Original line number Diff line number Diff line
@@ -92,8 +92,6 @@ static const __initdata struct idt_data def_idts[] = { 
	INTG(X86_TRAP_DF,		double_fault),

#endif

	INTG(X86_TRAP_DB,		debug),

	INTG(X86_TRAP_NMI,		nmi),

	INTG(X86_TRAP_BP,		int3),



#ifdef CONFIG_X86_MCE

	INTG(X86_TRAP_MC,		&machine_check),

arch/x86/kernel/smpboot.c

+6 −5
Original line number Diff line number Diff line
@@ -193,6 +193,12 @@ static void smp_callin(void) 
	 */

	smp_store_cpu_info(cpuid);



	/*

	 * The topology information must be up to date before

	 * calibrate_delay() and notify_cpu_starting().

	 */

	set_cpu_sibling_map(raw_smp_processor_id());



	/*

	 * Get our bogomips.

	 * Update loops_per_jiffy in cpu_data. Previous call to
@@ -203,11 +209,6 @@ static void smp_callin(void) 
	cpu_data(cpuid).loops_per_jiffy = loops_per_jiffy;

	pr_debug("Stack at about %p\n", &cpuid);



	/*

	 * This must be done before setting cpu_online_mask

	 * or calling notify_cpu_starting.

	 */

	set_cpu_sibling_map(raw_smp_processor_id());

	wmb();



	notify_cpu_starting(cpuid);

arch/x86/kernel/traps.c

+7 −3
Original line number Diff line number Diff line
@@ -209,9 +209,6 @@ do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str, 
		if (fixup_exception(regs, trapnr))

			return 0;



		if (fixup_bug(regs, trapnr))

			return 0;



		tsk->thread.error_code = error_code;

		tsk->thread.trap_nr = trapnr;

		die(str, regs, error_code);
@@ -292,6 +289,13 @@ static void do_error_trap(struct pt_regs *regs, long error_code, char *str, 


	RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");



	/*

	 * WARN*()s end up here; fix them up before we call the

	 * notifier chain.

	 */

	if (!user_mode(regs) && fixup_bug(regs, trapnr))

		return;



	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=

			NOTIFY_STOP) {

		cond_local_irq_enable(regs);

arch/x86/kernel/tsc.c

+3 −5
Original line number Diff line number Diff line
@@ -1346,12 +1346,10 @@ void __init tsc_init(void) 
unsigned long calibrate_delay_is_known(void)

{

	int sibling, cpu = smp_processor_id();

	struct cpumask *mask = topology_core_cpumask(cpu);

	int constant_tsc = cpu_has(&cpu_data(cpu), X86_FEATURE_CONSTANT_TSC);

	const struct cpumask *mask = topology_core_cpumask(cpu);



	if (!tsc_disabled && !cpu_has(&cpu_data(cpu), X86_FEATURE_CONSTANT_TSC))

		return 0;



	if (!mask)

	if (tsc_disabled || !constant_tsc || !mask)

		return 0;



	sibling = cpumask_any_but(mask, cpu);