linux-kernel - Re: [PATCH] powerpc/64: Fix build failure with allyesconfig in book3s_64

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Date:   Tue, 29 Mar 2022 18:22:28 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/64: Fix build failure with allyesconfig in
 book3s_64_entry.S

Excerpts from Christophe Leroy's message of March 27, 2022 5:32 pm:
> Using conditional branches between two files is hasardous,
> they may get linked to far from each other.
> 
> 	arch/powerpc/kvm/book3s_64_entry.o:(.text+0x3ec): relocation truncated
> 	to fit: R_PPC64_REL14 (stub) against symbol `system_reset_common'
> 	defined in .text section in arch/powerpc/kernel/head_64.o
> 
> Reorganise the code to use non conditional branches.

Thanks for the fix, I agree this is better.

Reviewed-by: Nicholas Piggin <npiggin@...il.com>

> 
> Cc: Nicholas Piggin <npiggin@...il.com>
> Fixes: 89d35b239101 ("KVM: PPC: Book3S HV P9: Implement the rest of the P9 path in C")
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/kvm/book3s_64_entry.S | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/powerpc/kvm/book3s_64_entry.S b/arch/powerpc/kvm/book3s_64_entry.S
> index 05e003eb5d90..99fa36df36fa 100644
> --- a/arch/powerpc/kvm/book3s_64_entry.S
> +++ b/arch/powerpc/kvm/book3s_64_entry.S
> @@ -414,10 +414,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_DAWR1)
>  	 */
>  	ld	r10,HSTATE_SCRATCH0(r13)
>  	cmpwi	r10,BOOK3S_INTERRUPT_MACHINE_CHECK
> -	beq	machine_check_common
> +	beq	1f
>  
>  	cmpwi	r10,BOOK3S_INTERRUPT_SYSTEM_RESET
> -	beq	system_reset_common
> +	bne	.
>  
> -	b	.
> +	b	system_reset_common
> +1:	b	machine_check_common
>  #endif
> -- 
> 2.35.1
> 
>