Hi Nick,

On Wed, 10 Feb 2021 18:20:54 +1000 Nicholas Piggin <npiggin@gmail.com> wrote:
>
> Thanks for that, it's due to .noinstr section being put on the other 
> side of .text, so all our interrupt handler asm code can't reach them 
> directly anymore since the ppc interrupt wrappers patch added noinstr
> attribute.
> 
> That's not strictly required though, we've used NOKPROBE_SYMBOL okay
> until now. If you can take this patch for now, it should get 
> allyesconfig to build again. I'll fix it in the powerpc tree before the 
> merge window.
> 
> --
> 
> diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
> index 4badb3e51c19..fee1e4dd1e84 100644
> --- a/arch/powerpc/include/asm/interrupt.h
> +++ b/arch/powerpc/include/asm/interrupt.h
> @@ -172,6 +172,8 @@ static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct inter
>  #define DECLARE_INTERRUPT_HANDLER_RAW(func)				\
>  	__visible long func(struct pt_regs *regs)
>  
> +#define ppc_noinstr         noinline notrace __no_kcsan __no_sanitize_address
> +
>  /**
>   * DEFINE_INTERRUPT_HANDLER_RAW - Define raw interrupt handler function
>   * @func:	Function name of the entry point
> @@ -198,7 +200,7 @@ static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct inter
>  #define DEFINE_INTERRUPT_HANDLER_RAW(func)				\
>  static __always_inline long ____##func(struct pt_regs *regs);		\
>  									\
> -__visible noinstr long func(struct pt_regs *regs)			\
> +__visible ppc_noinstr long func(struct pt_regs *regs)			\
>  {									\
>  	long ret;							\
>  									\
> @@ -228,7 +230,7 @@ static __always_inline long ____##func(struct pt_regs *regs)
>  #define DEFINE_INTERRUPT_HANDLER(func)					\
>  static __always_inline void ____##func(struct pt_regs *regs);		\
>  									\
> -__visible noinstr void func(struct pt_regs *regs)			\
> +__visible ppc_noinstr void func(struct pt_regs *regs)			\
>  {									\
>  	struct interrupt_state state;					\
>  									\
> @@ -262,7 +264,7 @@ static __always_inline void ____##func(struct pt_regs *regs)
>  #define DEFINE_INTERRUPT_HANDLER_RET(func)				\
>  static __always_inline long ____##func(struct pt_regs *regs);		\
>  									\
> -__visible noinstr long func(struct pt_regs *regs)			\
> +__visible ppc_noinstr long func(struct pt_regs *regs)			\
>  {									\
>  	struct interrupt_state state;					\
>  	long ret;							\
> @@ -297,7 +299,7 @@ static __always_inline long ____##func(struct pt_regs *regs)
>  #define DEFINE_INTERRUPT_HANDLER_ASYNC(func)				\
>  static __always_inline void ____##func(struct pt_regs *regs);		\
>  									\
> -__visible noinstr void func(struct pt_regs *regs)			\
> +__visible ppc_noinstr void func(struct pt_regs *regs)			\
>  {									\
>  	struct interrupt_state state;					\
>  									\
> @@ -331,7 +333,7 @@ static __always_inline void ____##func(struct pt_regs *regs)
>  #define DEFINE_INTERRUPT_HANDLER_NMI(func)				\
>  static __always_inline long ____##func(struct pt_regs *regs);		\
>  									\
> -__visible noinstr long func(struct pt_regs *regs)			\
> +__visible ppc_noinstr long func(struct pt_regs *regs)			\
>  {									\
>  	struct interrupt_nmi_state state;				\
>  	long ret;							\

Tested-by: Stephen Rothwell <sfr@canb.auug.org.au>  # allyesconfig build

-- 
Cheers,
Stephen Rothwell