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x86: Introduce ia32_enabled()

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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
This commit is contained in:
Nikolay Borisov 2023-06-23 14:14:04 +03:00 committed by Thomas Gleixner
parent 0bb80ecc33
commit 1da5c9bc11
2 changed files with 19 additions and 1 deletions
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4
arch/x86/entry/common.c
View file

@ -96,6 +96,10 @@ static __always_inline int syscall_32_enter(struct pt_regs *regs)
return (int)regs->orig_ax;
}
#ifdef CONFIG_IA32_EMULATION
bool __ia32_enabled __ro_after_init = true;
#endif
/*
* Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL.
*/

16
arch/x86/include/asm/ia32.h
View file

@ -68,6 +68,20 @@ extern void ia32_pick_mmap_layout(struct mm_struct *mm);
#endif
#endif /* CONFIG_IA32_EMULATION */
extern bool __ia32_enabled;
static inline bool ia32_enabled(void)
{
return __ia32_enabled;
}
#else /* !CONFIG_IA32_EMULATION */
static inline bool ia32_enabled(void)
{
return IS_ENABLED(CONFIG_X86_32);
}
#endif
#endif /* _ASM_X86_IA32_H */