x86: Introduce ia32_enabled()
IA32 support on 64bit kernels depends on whether CONFIG_IA32_EMULATION is selected or not. As it is a compile time option it doesn't provide the flexibility to have distributions set their own policy for IA32 support and give the user the flexibility to override it. As a first step introduce ia32_enabled() which abstracts whether IA32 compat is turned on or off. Upcoming patches will implement the ability to set IA32 compat state at boot time. Signed-off-by: Nikolay Borisov <nik.borisov@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20230623111409.3047467-2-nik.borisov@suse.com
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@ -96,6 +96,10 @@ static __always_inline int syscall_32_enter(struct pt_regs *regs)
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return (int)regs->orig_ax;
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}
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#ifdef CONFIG_IA32_EMULATION
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bool __ia32_enabled __ro_after_init = true;
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#endif
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/*
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* Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL.
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*/
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@ -68,6 +68,20 @@ extern void ia32_pick_mmap_layout(struct mm_struct *mm);
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#endif
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#endif /* CONFIG_IA32_EMULATION */
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extern bool __ia32_enabled;
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static inline bool ia32_enabled(void)
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{
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return __ia32_enabled;
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}
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#else /* !CONFIG_IA32_EMULATION */
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static inline bool ia32_enabled(void)
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{
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return IS_ENABLED(CONFIG_X86_32);
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}
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#endif
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#endif /* _ASM_X86_IA32_H */
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