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Message-ID: <58F06CEA-AEB3-4ED7-8211-95F402C9D3D3@xxxxxxxxx>
On August 22, 2016 5:07:39 PM PDT, "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx> wrote:
>On Fri, Aug 19, 2016 at 03:31:47PM -0700, Kees Cook wrote:
>> On Fri, Aug 19, 2016 at 2:41 PM, <mcgrof@xxxxxxxxxx> wrote:
>> > From: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx>
>> >
>> > Add a userspace sandbox to allow easy experimentation and
>> > test extensions with linker tables, section ranges and the
>> > new section core definitions.
>> >
>> > The userspace sandbox tries to mimic the Linux kernel development
>> > flow as much as possible, it however relies on and uses libc.
>Support
>> > is currently only provided to x86_64.
>> >
>> > v4: this patch is new in this series -- added to the kenrel as
>> > suggested by Boris, as otherwise it'd be really hard to keep
>> > an external userspace repository in sync.
>> >
>> > Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
>> > ---
>> > Documentation/sections/linker-tables.rst | 4 +-
>> > MAINTAINERS | 1 +
>> > include/linux/tables.h | 5 +-
>> > tools/Makefile | 3 +-
>> > .../arch/x86/include/generated/asm/section-core.h | 1 +
>> > tools/arch/x86/include/generated/ranges.h | 1 +
>> > tools/arch/x86/include/generated/tables.h | 1 +
>> > tools/include/asm-generic/ranges.h | 103 ++++
>> > tools/include/asm-generic/section-core.h | 341
>+++++++++++
>> > tools/include/asm-generic/tables.h | 50 ++
>>
>> Aren't a bunch of these files exact duplicates of the headers in
>include/linux?
>
>Indeed... This a userspace tools/ architecture decision that was made
>long ago,
>so its not up to me, I am just following the strategy devised and
>picked up.
>Refer to 7d7d1bf1d1dabe435ef50efb051724b8664749cb ("perf bench: Copy
>kernel
>files needed to build mem{cpy,set} x86_64 benchmarks") for an example
>of
>previous similar work. By sharing header files this enable more tools/
>to be hacked on.
>
> Luis
I think this is a legacy from before the uapi change that should really be fixed. If we need to export additional kernel structures for the tools, we could define a third level of we really need it.
--
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