linux-kernel - Re: [PATCH XEN] xen: event channel arrays are xen_ulong

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Message-ID: <alpine.DEB.2.02.1302191642060.4654@kaball.uk.xensource.com>
Date:	Tue, 19 Feb 2013 16:42:15 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Ian Campbell <ian.campbell@...rix.com>
CC:	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jan Beulich <JBeulich@...e.com>,
	"Keir (Xen.org)" <keir@....org>, "Tim (Xen.org)" <tim@....org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH XEN] xen: event channel arrays are xen_ulong_t and not
 unsigned long

On Tue, 19 Feb 2013, Ian Campbell wrote:
> On ARM we want these to be the same size on 32- and 64-bit.
> 
> This is an ABI change on ARM. X86 does not change.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Cc: Jan Beulich <JBeulich@...e.com>
> Cc: Keir (Xen.org) <keir@....org>
> Cc: Tim Deegan <tim@....org>
> Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: xen-devel@...ts.xen.org

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>


>  tools/include/xen-foreign/mkheader.py |    6 ++++++
>  xen/include/public/xen.h              |    8 ++++----
>  2 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/include/xen-foreign/mkheader.py b/tools/include/xen-foreign/mkheader.py
> index d189b07..57681fa 100644
> --- a/tools/include/xen-foreign/mkheader.py
> +++ b/tools/include/xen-foreign/mkheader.py
> @@ -21,13 +21,18 @@ inttypes["arm"] = {
>      "unsigned long" : "uint32_t",
>      "long"          : "uint32_t",
>      "xen_pfn_t"     : "uint64_t",
> +    "xen_ulong_t"   : "uint64_t",
>  };
> +header["arm"] = """
> +#define __arm___ARM32 1
> +""";
>  
>  # x86_32
>  inttypes["x86_32"] = {
>      "unsigned long" : "uint32_t",
>      "long"          : "uint32_t",
>      "xen_pfn_t"     : "uint32_t",
> +    "xen_ulong_t"   : "uint32_t",
>  };
>  header["x86_32"] = """
>  #define __i386___X86_32 1
> @@ -42,6 +47,7 @@ inttypes["x86_64"] = {
>      "unsigned long" : "__align8__ uint64_t",
>      "long"          : "__align8__ uint64_t",
>      "xen_pfn_t"     : "__align8__ uint64_t",
> +    "xen_ulong_t"   : "__align8__ uint64_t",
>  };
>  header["x86_64"] = """
>  #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
> diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
> index 5593066..99c8212 100644
> --- a/xen/include/public/xen.h
> +++ b/xen/include/public/xen.h
> @@ -556,7 +556,7 @@ DEFINE_XEN_GUEST_HANDLE(multicall_entry_t);
>   * Event channel endpoints per domain:
>   *  1024 if a long is 32 bits; 4096 if a long is 64 bits.
>   */
> -#define NR_EVENT_CHANNELS (sizeof(unsigned long) * sizeof(unsigned long) * 64)
> +#define NR_EVENT_CHANNELS (sizeof(xen_ulong_t) * sizeof(xen_ulong_t) * 64)
>  
>  struct vcpu_time_info {
>      /*
> @@ -613,7 +613,7 @@ struct vcpu_info {
>       */
>      uint8_t evtchn_upcall_pending;
>      uint8_t evtchn_upcall_mask;
> -    unsigned long evtchn_pending_sel;
> +    xen_ulong_t evtchn_pending_sel;
>      struct arch_vcpu_info arch;
>      struct vcpu_time_info time;
>  }; /* 64 bytes (x86) */
> @@ -663,8 +663,8 @@ struct shared_info {
>       * per-vcpu selector word to be set. Each bit in the selector covers a
>       * 'C long' in the PENDING bitfield array.
>       */
> -    unsigned long evtchn_pending[sizeof(unsigned long) * 8];
> -    unsigned long evtchn_mask[sizeof(unsigned long) * 8];
> +    xen_ulong_t evtchn_pending[sizeof(xen_ulong_t) * 8];
> +    xen_ulong_t evtchn_mask[sizeof(xen_ulong_t) * 8];
>  
>      /*
>       * Wallclock time: updated only by control software. Guests should base
> -- 
> 1.7.9.1
> 
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