linux-kernel - [PATCH V5 03/21] crypto: hisilicon/qm: Fix to enable build with RISC-V clang

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Date:   Mon,  8 May 2023 17:22:19 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-crypto@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        llvm@...ts.linux.dev
Cc:     Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Weili Qian <qianweili@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Marc Zyngier <maz@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Sunil V L <sunilvl@...tanamicro.com>
Subject: [PATCH V5 03/21] crypto: hisilicon/qm: Fix to enable build with RISC-V clang

With CONFIG_ACPI enabled for RISC-V, this driver gets enabled in
allmodconfig build. However, build fails with clang and below
error is seen.

drivers/crypto/hisilicon/qm.c:627:10: error: invalid output constraint '+Q' in asm
                       "+Q" (*((char __iomem *)fun_base))
                       ^
This is expected error with clang due to the way it is designed.

To fix this issue, move arm64 assembly code under #if.

Link: https://github.com/ClangBuiltLinux/linux/issues/999
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
[sunilvl@...tanamicro.com: Moved tmp0 and tmp1 into the #if]
Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/crypto/hisilicon/qm.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index ad0c042b5e66..2eaeaac2e246 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -610,13 +610,9 @@ EXPORT_SYMBOL_GPL(hisi_qm_wait_mb_ready);
 static void qm_mb_write(struct hisi_qm *qm, const void *src)
 {
 	void __iomem *fun_base = qm->io_base + QM_MB_CMD_SEND_BASE;
-	unsigned long tmp0 = 0, tmp1 = 0;
 
-	if (!IS_ENABLED(CONFIG_ARM64)) {
-		memcpy_toio(fun_base, src, 16);
-		dma_wmb();
-		return;
-	}
+#if IS_ENABLED(CONFIG_ARM64)
+	unsigned long tmp0 = 0, tmp1 = 0;
 
 	asm volatile("ldp %0, %1, %3\n"
 		     "stp %0, %1, %2\n"
@@ -626,6 +622,11 @@ static void qm_mb_write(struct hisi_qm *qm, const void *src)
 		       "+Q" (*((char __iomem *)fun_base))
 		     : "Q" (*((char *)src))
 		     : "memory");
+#else
+	memcpy_toio(fun_base, src, 16);
+	dma_wmb();
+#endif
+
 }
 
 static int qm_mb_nolock(struct hisi_qm *qm, struct qm_mailbox *mailbox)
-- 
2.34.1