Messages in this thread Patch in this message | | | From | Nikolay Borisov <> | Subject | [PATCH v4 1/6] x86: Introduce ia32_enabled() | Date | Fri, 23 Jun 2023 14:14:04 +0300 |
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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> --- arch/x86/entry/common.c | 4 ++++ arch/x86/include/asm/ia32.h | 16 +++++++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 6c2826417b33..ef5a154a7413 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -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 = true; +#endif + /* * Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL. */ diff --git a/arch/x86/include/asm/ia32.h b/arch/x86/include/asm/ia32.h index fada857f0a1e..5a2ae24b1204 100644 --- a/arch/x86/include/asm/ia32.h +++ b/arch/x86/include/asm/ia32.h @@ -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 */ -- 2.34.1
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