linux-kernel - Re: [RESEND Patch V2 1/4] xen: build infrastructure for generating hypercall depending symbols

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Date:	Fri, 06 Feb 2015 16:00:43 +0100
From:	Juergen Gross <jgross@...e.com>
To:	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, david.vrabel@...rix.com,
	boris.ostrovsky@...cle.com, mmarek@...e.cz,
	linux-kbuild@...r.kernel.org
Subject: Re: [RESEND Patch V2 1/4] xen: build infrastructure for generating
 hypercall depending symbols

Hey, x86 maintainers!

could you please comment?


Juergen

On 01/28/2015 06:11 AM, Juergen Gross wrote:
> *Ping*
>
> David wants a comment from the x86 maintainers.
>
>
> Juergen
>
> On 01/21/2015 08:49 AM, Juergen Gross wrote:
>> Today there are several places in the kernel which build tables
>> containing one entry for each possible Xen hypercall. Create an
>> infrastructure to be able to generate these tables at build time.
>>
>> Based-on-patch-by: Jan Beulich <jbeulich@...e.com>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> Reviewed-by: David Vrabel <david.vrabel@...rix.com>
>> ---
>>   arch/x86/syscalls/Makefile |  9 +++++++++
>>   scripts/xen-hypercalls.sh  | 12 ++++++++++++
>>   2 files changed, 21 insertions(+)
>>   create mode 100644 scripts/xen-hypercalls.sh
>>
>> diff --git a/arch/x86/syscalls/Makefile b/arch/x86/syscalls/Makefile
>> index 3323c27..a55abb9 100644
>> --- a/arch/x86/syscalls/Makefile
>> +++ b/arch/x86/syscalls/Makefile
>> @@ -19,6 +19,9 @@ quiet_cmd_syshdr = SYSHDR  $@
>>   quiet_cmd_systbl = SYSTBL  $@
>>         cmd_systbl = $(CONFIG_SHELL) '$(systbl)' $< $@
>>
>> +quiet_cmd_hypercalls = HYPERCALLS $@
>> +      cmd_hypercalls = $(CONFIG_SHELL) '$<' $@ $(filter-out $<,$^)
>> +
>>   syshdr_abi_unistd_32 := i386
>>   $(uapi)/unistd_32.h: $(syscall32) $(syshdr)
>>       $(call if_changed,syshdr)
>> @@ -47,10 +50,16 @@ $(out)/syscalls_32.h: $(syscall32) $(systbl)
>>   $(out)/syscalls_64.h: $(syscall64) $(systbl)
>>       $(call if_changed,systbl)
>>
>> +$(out)/xen-hypercalls.h: $(srctree)/scripts/xen-hypercalls.sh
>> +    $(call if_changed,hypercalls)
>> +
>> +$(out)/xen-hypercalls.h: $(srctree)/include/xen/interface/xen*.h
>> +
>>   uapisyshdr-y            += unistd_32.h unistd_64.h unistd_x32.h
>>   syshdr-y            += syscalls_32.h
>>   syshdr-$(CONFIG_X86_64)        += unistd_32_ia32.h unistd_64_x32.h
>>   syshdr-$(CONFIG_X86_64)        += syscalls_64.h
>> +syshdr-$(CONFIG_XEN)        += xen-hypercalls.h
>>
>>   targets    += $(uapisyshdr-y) $(syshdr-y)
>>
>> diff --git a/scripts/xen-hypercalls.sh b/scripts/xen-hypercalls.sh
>> new file mode 100644
>> index 0000000..676d922
>> --- /dev/null
>> +++ b/scripts/xen-hypercalls.sh
>> @@ -0,0 +1,12 @@
>> +#!/bin/sh
>> +out="$1"
>> +shift
>> +in="$@"
>> +
>> +for i in $in; do
>> +    eval $CPP $LINUXINCLUDE -dD -imacros "$i" -x c /dev/null
>> +done | \
>> +awk '$1 == "#define" && $2 ~ /__HYPERVISOR_[a-z][a-z_0-9]*/ { v[$3] =
>> $2 }
>> +    END {   print "/* auto-generated by scripts/xen-hypercall.sh */"
>> +        for (i in v) if (!(v[i] in v))
>> +            print "HYPERCALL("substr(v[i], 14)")"}' | sort -u >$out
>>
>
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