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authorThomas Gleixner <tglx@linutronix.de>2019-04-14 18:00:05 +0200
committerBorislav Petkov <bp@suse.de>2019-04-17 15:34:21 +0200
commit0ac26104208450d35c4e68754ce0c67b3a4d7802 (patch)
tree4ef4dacaa0d180a40372188c544f3d337ab0d19e /arch/x86/kernel/irq_64.c
parent66c7ceb47f628c8bd4f84a6d01c2725ded6a342d (diff)
downloadlinux-0ac26104208450d35c4e68754ce0c67b3a4d7802.tar.bz2
x86/irq/64: Init hardirq_stack_ptr during CPU hotplug
Preparatory change for disentangling the irq stack union as a prerequisite for irq stacks with guard pages. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Chang S. Bae" <chang.seok.bae@intel.com> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Nicolai Stange <nstange@suse.de> Cc: Pavel Tatashin <pasha.tatashin@oracle.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: x86-ml <x86@kernel.org> Cc: Yi Wang <wang.yi59@zte.com.cn> Link: https://lkml.kernel.org/r/20190414160146.177558566@linutronix.de
Diffstat (limited to 'arch/x86/kernel/irq_64.c')
-rw-r--r--arch/x86/kernel/irq_64.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index f0c7356c8969..c0bea0d7d76a 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -87,3 +87,18 @@ bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
generic_handle_irq_desc(desc);
return true;
}
+
+static int map_irq_stack(unsigned int cpu)
+{
+ void *va = per_cpu_ptr(irq_stack_union.irq_stack, cpu);
+
+ per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE;
+ return 0;
+}
+
+int irq_init_percpu_irqstack(unsigned int cpu)
+{
+ if (per_cpu(hardirq_stack_ptr, cpu))
+ return 0;
+ return map_irq_stack(cpu);
+}