Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative

[Juergen Gross <jgross@suse.com>]

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On 25.10.23 12:34, Borislav Petkov wrote:
> On Thu, Oct 19, 2023 at 11:15:16AM +0200, Juergen Gross wrote:
>> +/* Low-level backend functions usable from alternative code replacements. */
>> +DEFINE_ASM_FUNC(x86_nop, "", .entry.text);
>> +EXPORT_SYMBOL_GPL(x86_nop);
> 
> This is all x86 code so you don't really need the "x86_" prefix - "nop"
> is perfectly fine.

There is

#define nop() asm volatile ("nop")

in arch/x86/include/asm/special_insns.h already.

> 
>> +noinstr void x86_BUG(void)
>> +{
>> +	BUG();
>> +}
>> +EXPORT_SYMBOL_GPL(x86_BUG);
> 
> That export is needed for?
> 
> Paravirt stuff in modules?
> 
> It builds here without it - I guess I need to do an allmodconfig.
> 

It might not be needed now, but are you sure we won't need it in future?


Juergen

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