Re: [PATCH v23 6/9] x86/entry: Introduce ENDBR macro

[Borislav Petkov]

On Tue, Mar 16, 2021 at 10:12:39AM -0700, Yu, Yu-cheng wrote:
> Alternatively, there is another compiler-defined macro _CET_ENDBR that can
> be used.  We can put the following in calling.h:

Not calling.h - this is apparently needed in vdso code only so I guess
some header there, arch/x86/include/asm/vdso.h maybe? In the

#else /* __ASSEMBLER__ */

branch maybe...

> #ifdef __CET__
> #include <cet.h>
> #else
> #define _CET_ENDBR
> #endif
> 
> and then use _CET_ENDBR in other files.  How is that?

What does that macro do? Issue an ENDBR only?

-- 
Regards/Gruss,
    Boris.

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