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

[Juergen Gross]

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David still 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@xxxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>
> ---
>   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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