linux-kernel - RE: [PATCH v3 2/6] efi/cper: Export cper_mem_err

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Message-ID: <643dd15e9bb8_1b662943c@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Mon, 17 Apr 2023 16:08:14 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Terry Bowman <terry.bowman@....com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <dave.jiang@...el.com>, <Jonathan.Cameron@...wei.com>,
        <linux-cxl@...r.kernel.org>
CC:     <terry.bowman@....com>, <rrichter@....com>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>, <linux-efi@...r.kernel.org>
Subject: RE: [PATCH v3 2/6] efi/cper: Export cper_mem_err_unpack() for use by
 modules

Terry Bowman wrote:
> The CXL driver plans to use cper_print_aer() for restricted CXL host (RCH)
> logging. This is not currently possible if CXL is built as a loadable
> module because cper_print_aer() depends on cper_mem_err_unpack() which
> is not exported.
> 
> Export cper_mem_err_unpack() to enable cper_print_aer() usage in
> CXL and other loadable modules.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: linux-efi@...r.kernel.org
> ---
>  drivers/firmware/efi/cper.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 35c37f667781..ff15e12160ae 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -350,6 +350,7 @@ const char *cper_mem_err_unpack(struct trace_seq *p,
>  
>  	return ret;
>  }
> +EXPORT_SYMBOL_GPL(cper_mem_err_unpack);

Looks ok to me. You could make it:

EXPORT_SYMBOL_NS_GPL(cper_mem_err_unpack, CXL)

...to make it clear that this is really only meant to be consumed by the
CXL subsystem. That was also the approach taken with the otherwise
internal-only insert_resource_expand_to_fit() symbol.