linux-kernel - [PATCH] crypto: Make hifn_795x build depend on !ARCH_DMA_ADDR_T

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Date:	Mon, 10 Oct 2011 12:55:41 +0200
From:	Richard Weinberger <richard@....at>
To:	linux-kernel@...r.kernel.org
Cc:	linux-crypto@...r.kernel.org, herbert@...dor.apana.org.au,
	davem@...emloft.net, Richard Weinberger <richard@....at>
Subject: [PATCH] crypto: Make hifn_795x build depend on !ARCH_DMA_ADDR_T_64BIT

hifn_795x works only on 32 bit, remove the detection while loading
the module and catch non-32 bit systems at build time.

Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/crypto/Kconfig     |    1 +
 drivers/crypto/hifn_795x.c |    6 ++----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index e0b25de..fdbb726 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -200,6 +200,7 @@ config CRYPTO_DEV_HIFN_795X
 	select CRYPTO_BLKCIPHER
 	select HW_RANDOM if CRYPTO_DEV_HIFN_795X_RNG
 	depends on PCI
+	depends on !ARCH_DMA_ADDR_T_64BIT
 	help
 	  This option allows you to have support for HIFN 795x crypto adapters.
 
diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index a84250a..fe765f4 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -2744,10 +2744,8 @@ static int __init hifn_init(void)
 	unsigned int freq;
 	int err;
 
-	if (sizeof(dma_addr_t) > 4) {
-		printk(KERN_INFO "HIFN supports only 32-bit addresses.\n");
-		return -EINVAL;
-	}
+	/* HIFN supports only 32-bit addresses */
+	BUILD_BUG_ON(sizeof(dma_addr_t) != 4);
 
 	if (strncmp(hifn_pll_ref, "ext", 3) &&
 	    strncmp(hifn_pll_ref, "pci", 3)) {
-- 
1.7.7

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