Re: [PATCH] firmware: qcom: qcm: fix unused qcom_scm_qseecom_allowlist

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Am 11/21/2023 um 8:07 AM schrieb Krzysztof Kozlowski:
On 20/11/2023 20:56, Maximilian Luz wrote:
On 11/20/23 19:56, Krzysztof Kozlowski wrote:
For !OF builds, the qcom_scm_qseecom_allowlist is unused:

    drivers/firmware/qcom/qcom_scm.c:1652:34: error: ‘qcom_scm_qseecom_allowlist’ defined but not used [-Werror=unused-const-variable=]

Fixes: 00b1248606ba ("firmware: qcom_scm: Add support for Qualcomm Secure Execution Environment SCM interface")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202311191654.S4wlVUrz-lkp@xxxxxxxxx/
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
   drivers/firmware/qcom/qcom_scm.c | 2 +-
   1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 520de9b5633a..ecdb367dc9b8 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -1649,7 +1649,7 @@ EXPORT_SYMBOL_GPL(qcom_scm_qseecom_app_send);
    * We do not yet support re-entrant calls via the qseecom interface. To prevent
    + any potential issues with this, only allow validated machines for now.
    */
-static const struct of_device_id qcom_scm_qseecom_allowlist[] = {
+static const struct of_device_id qcom_scm_qseecom_allowlist[] __maybe_unused = {
   	{ .compatible = "lenovo,thinkpad-x13s", },
   	{ }
   };

Thanks! Given that we're right now only allowing qseecom clients to load
on devices within that list, maybe it would be cleaner to make
QCOM_QSEECOM depend on OF explicitly instead?

There is no code dependency here.

Which is why I'm fine with this as well. It would just drop
currently unused code on !OF configs.

The driver should already depend on
ARCH_QCOM which select OF. Are you saying it does not depend on
ARCH_QCOM? Why?

QCOM_QSEECOM depends only on QCOM_SCM. QCOM_SCM does not have
any dependencies. Instead, it is selected by ARCH_QCOM.

Best regards,
Max




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