linux-kernel - Re: [PATCH v2 04/16] powerpc: Curb objtool unannotated intra-function warnings

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Date:   Tue, 30 Aug 2022 06:26:00 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Sathvika Vasireddy <sv@...ux.ibm.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
CC:     "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "aik@...abs.ru" <aik@...abs.ru>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "npiggin@...il.com" <npiggin@...il.com>,
        "chenzhongjin@...wei.com" <chenzhongjin@...wei.com>,
        "naveen.n.rao@...ux.vnet.ibm.com" <naveen.n.rao@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 04/16] powerpc: Curb objtool unannotated intra-function
 warnings



Le 29/08/2022 à 07:52, Sathvika Vasireddy a écrit :
> objtool throws the following unannotated intra-function call
> warnings:
> 
> arch/powerpc/kernel/entry_64.o: warning: objtool: .text+0x4: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xe64: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xee4: unannotated intra-function call
> 
> Fix these warnings by annotating intra-function
> call, using ANNOTATE_INTRA_FUNCTION_CALL macro,
> to indicate that the branch targets are valid.
> 
> Signed-off-by: Sathvika Vasireddy <sv@...ux.ibm.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   arch/powerpc/kernel/entry_64.S          | 2 ++
>   arch/powerpc/kvm/book3s_hv_rmhandlers.S | 3 +++
>   2 files changed, 5 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
> index 01ace4c56104..fb444bc64f3f 100644
> --- a/arch/powerpc/kernel/entry_64.S
> +++ b/arch/powerpc/kernel/entry_64.S
> @@ -14,6 +14,7 @@
>    *  code, and exception/interrupt return code for PowerPC.
>    */
>   
> +#include <linux/objtool.h>
>   #include <linux/errno.h>
>   #include <linux/err.h>
>   #include <asm/cache.h>
> @@ -73,6 +74,7 @@ flush_branch_caches:
>   
>   	// Flush the link stack
>   	.rept 64
> +	ANNOTATE_INTRA_FUNCTION_CALL
>   	bl	.+4
>   	.endr
>   	b	1f
> diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> index de91118df0c5..ea39a0cf591a 100644
> --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> @@ -30,6 +30,7 @@
>   #include <asm/feature-fixups.h>
>   #include <asm/cpuidle.h>
>   #include <linux/linkage.h>
> +#include <linux/objtool.h>
>   
>   /* Values in HSTATE_NAPPING(r13) */
>   #define NAPPING_CEDE	1
> @@ -1523,12 +1524,14 @@ kvm_flush_link_stack:
>   
>   	/* Flush the link stack. On Power8 it's up to 32 entries in size. */
>   	.rept 32
> +	ANNOTATE_INTRA_FUNCTION_CALL
>   	bl	.+4
>   	.endr
>   
>   	/* And on Power9 it's up to 64. */
>   BEGIN_FTR_SECTION
>   	.rept 32
> +	ANNOTATE_INTRA_FUNCTION_CALL
>   	bl	.+4
>   	.endr
>   END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)