diff options
| author | Andy Lutomirski <luto@kernel.org> | 2019-04-14 17:59:40 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-04-17 12:31:38 +0200 |
| commit | 4f44b8f0b33b7111216f0fad353315f796b81617 (patch) | |
| tree | a6e68d7f6a9d26d72c81d0ce72978775317a2b56 /arch/x86/kernel/irq_64.c | |
| parent | fa33215422fd415a07ec2a00e9f1acdaf0fa8e94 (diff) | |
| download | linux-4f44b8f0b33b7111216f0fad353315f796b81617.tar.bz2 | |
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@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160143.872549191@linutronix.de
Diffstat (limited to 'arch/x86/kernel/irq_64.c')
| -rw-r--r-- | arch/x86/kernel/irq_64.c | 3 |
1 files changed, 1 insertions, 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; |