Commit-ID: 4f44b8f0b33b7111216f0fad353315f796b81617 Gitweb: https://git.kernel.org/tip/4f44b8f0b33b7111216f0fad353315f796b81617 Author: Andy Lutomirski <luto@xxxxxxxxxx> AuthorDate: Sun, 14 Apr 2019 17:59:40 +0200 Committer: Borislav Petkov <bp@xxxxxxx> CommitDate: Wed, 17 Apr 2019 12:31:38 +0200 x86/irq/64: Remove a hardcoded irq_stack_union access stack_overflow_check() is using both irq_stack_ptr and irq_stack_union to find the IRQ stack. That's going to break when vmapped irq stacks are introduced. Change it to just use irq_stack_ptr. Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Reviewed-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Nicolai Stange <nstange@xxxxxxx> Cc: x86-ml <x86@xxxxxxxxxx> Link: https://lkml.kernel.org/r/20190414160143.872549191@xxxxxxxxxxxxx --- arch/x86/kernel/irq_64.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c index b50ac9c7397b..f6dcc8fea5c0 100644 --- a/arch/x86/kernel/irq_64.c +++ b/arch/x86/kernel/irq_64.c @@ -55,9 +55,8 @@ static inline void stack_overflow_check(struct pt_regs *regs) regs->sp <= curbase + THREAD_SIZE) return; - irq_stack_top = (u64)this_cpu_ptr(irq_stack_union.irq_stack) + - STACK_TOP_MARGIN; irq_stack_bottom = (u64)__this_cpu_read(irq_stack_ptr); + irq_stack_top = irq_stack_bottom - IRQ_STACK_SIZE + STACK_TOP_MARGIN; if (regs->sp >= irq_stack_top && regs->sp <= irq_stack_bottom) return;
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