Subject: Re: [PATCH] cxl: Fix ambiguous else warnings

From: Andreas Schwab <[email-masked]>
Date: Fri, 31 Jul 2015 11:16:52 +0200

Daniel Axtens <[email-masked]> writes:

> Every time I build cxl I see the following warnings:
>
> /scratch/dja/linux-capi/drivers/misc/cxl/pci.c: In function ‘sanitise_afu_regs’:
> /scratch/dja/linux-capi/drivers/misc/cxl/pci.c:712:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses]
>    if (reg & CXL_PSL_DSISR_TRANS)
>       ^
> /scratch/dja/linux-capi/drivers/misc/cxl/irq.c: In function ‘fail_psl_irq’:
> /scratch/dja/linux-capi/drivers/misc/cxl/irq.c:184:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses]
>   if (irq_info->dsisr & CXL_PSL_DSISR_TRANS)
>      ^

Why are they ambigous?  Why doesn't cxl_p2n_write(afu, CXL_PSL_TFC_An,
CXL_PSL_TFC_An_AE) expand to a proper statement?

#define cxl_p2n_write(afu, reg, val) \
	out_be64(_cxl_p2n_addr(afu, reg), val)

Andreas.

-- 
Andreas Schwab, [email-masked]
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