Re: [PATCH 03/24] x86/paravirt: Annotate indirect calls

[Josh Poimboeuf]

On Tue, Jan 23, 2018 at 04:25:42PM +0100, Peter Zijlstra wrote:
> Paravirt emits indirect calls which get flagged by objtool retpoline
> checks, annotate it away because all these indirect calls will be
> patched out before we start userspace.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> ---
>  arch/x86/include/asm/paravirt.h       |   22 ++++++++++++++++++----
>  arch/x86/include/asm/paravirt_types.h |    7 ++++++-
>  2 files changed, 24 insertions(+), 5 deletions(-)
> 
> --- a/arch/x86/include/asm/paravirt.h
> +++ b/arch/x86/include/asm/paravirt.h
> @@ -828,6 +828,12 @@ extern void default_banner(void);
>  	 .short clobbers;			\
>  	.popsection
>  
> +#define PARA_RETPOLINE_SAFE				\
> +	773:;						\
> +	.pushsection .discard.retpoline_safe;		\
> +	_ASM_PTR 773b;					\
> +	.popsection

Why does paravirt have its own version of this macro?

-- 
Josh