linux-kernel - Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c

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Date:   Wed, 17 Mar 2021 14:04:33 +1100
From:   Daniel Axtens <dja@...ens.net>
To:     He Ying <heying24@...wei.com>, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org, npiggin@...il.com,
        akpm@...ux-foundation.org, aneesh.kumar@...ux.ibm.com,
        rppt@...nel.org, ardb@...nel.org, clg@...d.org,
        christophe.leroy@...roup.eu
Cc:     johnny.chenyi@...wei.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

Hi He Ying,

Thank you for this patch.

I'm not sure what the precise rules for Fixes are, but I wonder if this
should have:

Fixes: 9a32a7e78bd0 ("powerpc/64s: flush L1D after user accesses")
Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")

Those are the commits that added the entry_flush and uaccess_flush
symbols. Perhaps one for rfi_flush too but I'm not sure what commit
introduced that.

Kind regards,
Daniel

> warning: symbol 'rfi_flush' was not declared.
> warning: symbol 'entry_flush' was not declared.
> warning: symbol 'uaccess_flush' was not declared.
> We found warnings above in arch/powerpc/kernel/setup_64.c by using
> sparse tool.
>
> Define 'entry_flush' and 'uaccess_flush' as static because they are not
> referenced outside the file. Include asm/security_features.h in which
> 'rfi_flush' is declared.
>
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: He Ying <heying24@...wei.com>
> ---
>  arch/powerpc/kernel/setup_64.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index 560ed8b975e7..f92d72a7e7ce 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -68,6 +68,7 @@
>  #include <asm/early_ioremap.h>
>  #include <asm/pgalloc.h>
>  #include <asm/asm-prototypes.h>
> +#include <asm/security_features.h>
>  
>  #include "setup.h"
>  
> @@ -949,8 +950,8 @@ static bool no_rfi_flush;
>  static bool no_entry_flush;
>  static bool no_uaccess_flush;
>  bool rfi_flush;
> -bool entry_flush;
> -bool uaccess_flush;
> +static bool entry_flush;
> +static bool uaccess_flush;
>  DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
>  EXPORT_SYMBOL(uaccess_flush_key);
>  
> -- 
> 2.17.1