On 20.11.20 12:59, Peter Zijlstra wrote:
On Fri, Nov 20, 2020 at 12:46:23PM +0100, Juergen Gross wrote:+static __always_inline void arch_local_irq_restore(unsigned long flags) +{ + if (!arch_irqs_disabled_flags(flags)) + arch_local_irq_enable(); +}If someone were to write horrible code like: local_irq_disable(); local_irq_save(flags); local_irq_enable(); local_irq_restore(flags); we'd be up some creek without a paddle... now I don't _think_ we have genius code like that, but I'd feel saver if we can haz an assertion in there somewhere... Maybe something like: #ifdef CONFIG_DEBUG_ENTRY // for lack of something saner WARN_ON_ONCE((arch_local_save_flags() ^ flags) & X86_EFLAGS_IF); #endif At the end?
I'd like to, but using WARN_ON_ONCE() in include/asm/irqflags.h sounds
like a perfect receipt for include dependency hell.
We could use a plain asm("ud2") instead.
Juergen
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