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Date:   Wed, 4 Jan 2023 16:15:52 -0700
From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Cc:     linux-remoteproc@vger.kernel.org, agross@kernel.org,
        andersson@kernel.org, lgirdwood@gmail.com, broonie@kernel.org,
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        perex@perex.cz, tiwai@suse.com, srinivas.kandagatla@linaro.org,
        quic_rohkumar@quicinc.com, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org, swboyd@chromium.org,
        judyhsiao@chromium.org, devicetree@vger.kernel.org,
        krzysztof.kozlowski@linaro.org, corbet@lwn.net
Subject: Re: [PATCH v4 1/2] remoteproc: elf_loader: Update resource table
 name check
Message-ID: <20230104231552.GD2112402@p14s>
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On Wed, Dec 21, 2022 at 11:40:32AM +0530, Srinivasa Rao Mandadapu wrote:
> Update the way of checking resource table name with prefix substring search
> instead of complete string search.
> 
> In general, Qualcomm DSP binary is prepared by combining different ELFs'.
> Hence, section header name (e.g. .resource_table), appended with ELF name
> to differentiate with same section(e.g. resource_table.ac_bin_process) of
> different ELFs'.
>

Well, they are different ELF files so it is implied the resource section may be
different...  And from what I see this is purely a human thing and not
specifically needed by machines.  

I can't imagine this is a new situation and as such must ask how it was working
before?

> Example readelf output of DSP binary:
>     [60] .start.ac_bin_process PROGBITS
>     [61] .resource_table.ac_bin_process PROGBITS

The real question is...  Why is this labeled ".resource_table.ac_bin_process"
rather than simply ".resource_table"?

>     [62] .comment.ac_bin_process PROGBITS
> 
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
> Reviewed-by: Philippe Mathieu-Daud? <philmd@linaro.org>
> Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
> ---
>  drivers/remoteproc/remoteproc_elf_loader.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
> index 5a412d7..77330d6 100644
> --- a/drivers/remoteproc/remoteproc_elf_loader.c
> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
> @@ -272,7 +272,7 @@ find_table(struct device *dev, const struct firmware *fw)
>  		u64 offset = elf_shdr_get_sh_offset(class, shdr);
>  		u32 name = elf_shdr_get_sh_name(class, shdr);
>  
> -		if (strcmp(name_table + name, ".resource_table"))
> +		if (!strstarts(name_table + name, ".resource_table"))
>  			continue;
>  
>  		table = (struct resource_table *)(elf_data + offset);
> -- 
> 2.7.4
>