linux-kernel - Re: [PATCH v4 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available

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Date:   Fri, 11 May 2018 15:20:21 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Alastair D'Silva <alastair@....ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     mikey@...ling.org, arnd@...db.de, linux-doc@...r.kernel.org,
        malat@...ian.org, gregkh@...uxfoundation.org, corbet@....net,
        vaibhav@...ux.vnet.ibm.com, npiggin@...il.com,
        linux-kernel@...r.kernel.org, fbarrat@...ux.vnet.ibm.com,
        aneesh.kumar@...ux.vnet.ibm.com, andrew.donnellan@....ibm.com,
        pombredanne@...b.com, felix@...ux.vnet.ibm.com,
        sukadev@...ux.vnet.ibm.com, Alastair D'Silva <alastair@...ilva.org>
Subject: Re: [PATCH v4 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available

"Alastair D'Silva" <alastair@....ibm.com> writes:

> diff --git a/include/uapi/misc/ocxl.h b/include/uapi/misc/ocxl.h
> index 8d2748e69c84..bb80f294b429 100644
> --- a/include/uapi/misc/ocxl.h
> +++ b/include/uapi/misc/ocxl.h
> @@ -72,5 +75,6 @@ struct ocxl_ioctl_irq_fd {
>  #define OCXL_IOCTL_IRQ_SET_FD	_IOW(OCXL_MAGIC, 0x13, struct ocxl_ioctl_irq_fd)
>  #define OCXL_IOCTL_GET_METADATA _IOR(OCXL_MAGIC, 0x14, struct ocxl_ioctl_metadata)
>  #define OCXL_IOCTL_ENABLE_P9_WAIT	_IOR(OCXL_MAGIC, 0x15, struct ocxl_ioctl_p9_wait)
> +#define OCXL_IOCTL_GET_FEATURES _IOR(OCXL_MAGIC, 0x16, struct ocxl_ioctl_platform)

I don't have ocxl_ioctl_platform ?

../include/uapi/misc/ocxl.h:78:56: error: invalid application of ‘sizeof’ to incomplete type ‘struct ocxl_ioctl_platform’
 #define OCXL_IOCTL_GET_FEATURES _IOR(OCXL_MAGIC, 0x16, struct ocxl_ioctl_platform)
                                                        ^
../include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro ‘_IOC’
   ((size) << _IOC_SIZESHIFT))
     ^~~~
../include/uapi/asm-generic/ioctl.h:86:56: note: in expansion of macro ‘_IOC_TYPECHECK’
 #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
                                                        ^~~~~~~~~~~~~~
../include/uapi/misc/ocxl.h:78:33: note: in expansion of macro ‘_IOR’
 #define OCXL_IOCTL_GET_FEATURES _IOR(OCXL_MAGIC, 0x16, struct ocxl_ioctl_platform)
                                 ^~~~
../drivers/misc/ocxl/file.c:262:7: note: in expansion of macro ‘OCXL_IOCTL_GET_FEATURES’
  case OCXL_IOCTL_GET_FEATURES:
       ^~~~~~~~~~~~~~~~~~~~~~~

cheers