linux-kernel - Re: [PATCH v4 2/3] x86/mce: Define function to extract ErrorAddr from MCA

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Message-ID: <YkmeJFXXbu3aLzzw@zn.tnic>
Date:   Sun, 3 Apr 2022 15:16:20 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Cc:     x86@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH v4 2/3] x86/mce: Define function to extract ErrorAddr
 from MCA_ADDR

On Thu, Mar 31, 2022 at 03:24:37PM +0200, Borislav Petkov wrote:
> diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
> index 1940d305db1c..a1a4a5dc53e8 100644
> --- a/arch/x86/kernel/cpu/mce/amd.c
> +++ b/arch/x86/kernel/cpu/mce/amd.c
> @@ -722,6 +722,19 @@ bool amd_mce_is_memory_error(struct mce *m)
>  	return m->bank == 4 && xec == 0x8;
>  }
>  
> +/* Extract [55:<lsb>] where lsb is the LS-*valid* bit of the address bits. */
> +void smca_extract_err_addr(struct mce *m)

In addition:

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 9ccc2ea0ea00..4acc7959be6e 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -723,7 +723,7 @@ bool amd_mce_is_memory_error(struct mce *m)
 }
 
 /* Extract [55:<lsb>] where lsb is the LS-*valid* bit of the address bits. */
-void smca_extract_err_addr(struct mce *m)
+void __always_inline smca_extract_err_addr(struct mce *m)
 {
 	u8 lsb;
 

because some compilers cause:

vmlinux.o: warning: objtool: mce_read_aux()+0x82: call to smca_extract_err_addr() leaves .noinstr.text section

-- 
Regards/Gruss,
    Boris.

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