linux-kernel - [PATCH v2] crypto - img-hash: Depend on OF and silence compile test warning

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Date:   Sun, 19 Mar 2023 15:44:39 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2] crypto - img-hash: Depend on OF and silence compile test warning

The driver is specific to OF platforms (can match only via OF table),
thus add dependency on CONFIG_OF.  Mark the of_device_id table as
unused.  This also fixes W=1 warning:

  drivers/crypto/img-hash.c:930:34: error: ‘img_hash_match’ defined but not used [-Werror=unused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Changes since v1:
1. Rework - depend on OF and add maybe_unused.
---
 drivers/crypto/Kconfig    | 1 +
 drivers/crypto/img-hash.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 3b2516d1433f..4a4aff8b16f0 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -647,6 +647,7 @@ source "drivers/crypto/vmx/Kconfig"
 config CRYPTO_DEV_IMGTEC_HASH
 	tristate "Imagination Technologies hardware hash accelerator"
 	depends on MIPS || COMPILE_TEST
+	depends on OF || COMPILE_TEST
 	select CRYPTO_MD5
 	select CRYPTO_SHA1
 	select CRYPTO_SHA256
diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index fe93d19e3044..2be364d9f592 100644
--- a/drivers/crypto/img-hash.c
+++ b/drivers/crypto/img-hash.c
@@ -927,7 +927,7 @@ static void img_hash_done_task(unsigned long data)
 	img_hash_finish_req(hdev->req, err);
 }
 
-static const struct of_device_id img_hash_match[] = {
+static const struct of_device_id img_hash_match[] __maybe_unused = {
 	{ .compatible = "img,hash-accelerator" },
 	{}
 };
-- 
2.34.1