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

[Herbert Xu]

On Mon, May 08, 2023 at 05:22:19PM +0530, Sunil V L wrote:
> 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@xxxxxxxxxx>
> [sunilvl@xxxxxxxxxxxxxxxx: Moved tmp0 and tmp1 into the #if]
> Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>
> ---
>  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;
> -	}

Please leave this bit as it stands.

> +#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");

And simply add the ifdef around the assembly.

Thanks,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt