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Commit 09c2fe60 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 's390-5.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 

Pull s390 fixes from Martin Schwidefsky:

 - Do not claim to run under z/VM if the hypervisor can not be
   identified

 - Fix crashes due to outdated ASCEs in CR1

 - Avoid a deadlock in regard to CPU hotplug

 - Really fix the vdso mapping issue for compat tasks

 - Avoid crash on restart due to an incorrect stack address

* tag 's390-5.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/smp: Fix calling smp_call_ipl_cpu() from ipl CPU
  s390/vdso: correct vdso mapping for compat tasks
  s390/smp: fix CPU hotplug deadlock with CPU rescan
  s390/mm: always force a load of the primary ASCE on context switch
  s390/early: improve machine detection
parents 333478a7 60f1bf29

arch/s390/include/asm/mmu_context.h

+3 −4
Original line number Diff line number Diff line
@@ -25,7 +25,7 @@ static inline int init_new_context(struct task_struct *tsk, 
	atomic_set(&mm->context.flush_count, 0);

	mm->context.gmap_asce = 0;

	mm->context.flush_mm = 0;

	mm->context.compat_mm = 0;

	mm->context.compat_mm = test_thread_flag(TIF_31BIT);

#ifdef CONFIG_PGSTE

	mm->context.alloc_pgste = page_table_allocate_pgste ||

		test_thread_flag(TIF_PGSTE) ||
@@ -90,8 +90,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
{

	int cpu = smp_processor_id();



	if (prev == next)

		return;

	S390_lowcore.user_asce = next->context.asce;

	cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);

	/* Clear previous user-ASCE from CR1 and CR7 */
@@ -103,6 +101,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
		__ctl_load(S390_lowcore.vdso_asce, 7, 7);

		clear_cpu_flag(CIF_ASCE_SECONDARY);

	}

	if (prev != next)

		cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);

}

arch/s390/kernel/early.c

+2 −2
Original line number Diff line number Diff line
@@ -63,10 +63,10 @@ static noinline __init void detect_machine_type(void) 
	if (stsi(vmms, 3, 2, 2) || !vmms->count)

		return;



	/* Running under KVM? If not we assume z/VM */

	/* Detect known hypervisors */

	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))

		S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;

	else

	else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))

		S390_lowcore.machine_flags |= MACHINE_FLAG_VM;

}

arch/s390/kernel/setup.c

+2 −0
Original line number Diff line number Diff line
@@ -1006,6 +1006,8 @@ void __init setup_arch(char **cmdline_p) 
		pr_info("Linux is running under KVM in 64-bit mode\n");

	else if (MACHINE_IS_LPAR)

		pr_info("Linux is running natively in 64-bit mode\n");

	else

		pr_info("Linux is running as a guest in 64-bit mode\n");



	/* Have one command line that is parsed and saved in /proc/cmdline */

	/* boot_command_line has been already set up in early.c */

arch/s390/kernel/smp.c

+10 −1
Original line number Diff line number Diff line
@@ -381,8 +381,13 @@ void smp_call_online_cpu(void (*func)(void *), void *data) 
 */

void smp_call_ipl_cpu(void (*func)(void *), void *data)

{

	struct lowcore *lc = pcpu_devices->lowcore;



	if (pcpu_devices[0].address == stap())

		lc = &S390_lowcore;



	pcpu_delegate(&pcpu_devices[0], func, data,

		      pcpu_devices->lowcore->nodat_stack);

		      lc->nodat_stack);

}



int smp_find_processor_id(u16 address)
@@ -1166,7 +1171,11 @@ static ssize_t __ref rescan_store(struct device *dev, 
{

	int rc;



	rc = lock_device_hotplug_sysfs();

	if (rc)

		return rc;

	rc = smp_rescan_cpus();

	unlock_device_hotplug();

	return rc ? rc : count;

}

static DEVICE_ATTR_WO(rescan);

arch/s390/kernel/vdso.c

+2 −3
Original line number Diff line number Diff line
@@ -224,10 +224,9 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 


	vdso_pages = vdso64_pages;

#ifdef CONFIG_COMPAT

	if (is_compat_task()) {

	mm->context.compat_mm = is_compat_task();

	if (mm->context.compat_mm)

		vdso_pages = vdso32_pages;

		mm->context.compat_mm = 1;

	}

#endif

	/*

	 * vDSO has a problem and was disabled, just don't "enable" it for