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

- From: Yu, Yu-cheng \<hidden\>
- Date: 2021-03-16 20:06:34 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2021/03/6303790
- Thread: https://ratatoskr.run/linux-doc/2021/03/6303399/t.md

```text
On 3/16/2021 12:57 PM, Peter Zijlstra wrote:
> 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:
>>
>> #ifdef __CET__
>> #include <cet.h>
>> #else
>> #define _CET_ENDBR
>> #endif
>>
>> and then use _CET_ENDBR in other files.  How is that?
>>
>> In the future, in case we have kernel-mode IBT, ENDBR macros are also needed
>> for other assembly files.
>
> Can we please call it IBT_ENDBR or just ENDBR. CET is a horrible name,
> seeing how it is not specific.
>

_CET_ENDBR is from the compiler and we cannot change it.  We can do:

#define ENDBR _CET_ENDBR

How is that?
```