Re: [Qemu-devel] [PATCH] unicore32: Mark as deprecated

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Mar 08, 2018 at 03:40:16PM +0000, Peter Maydell wrote:
> We intend to remove the unicore32 target code:
> 
>  * It has had no changes since 2012 that were not tree-wide
>    maintenance/API changes/other global updates
>  * We dropped the linux-user unicore32 support in 2016 because of a
>    clash between the 'old ABI' that it was implementing and the ABI
>    that's actually in the upstream Linux kernel, and there have been
>    no moves to get this fixed so we could re-enable it, nor any
>    complaints when it went away
>  * Linux is now planning to drop unicore support:
>    https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1619640.html
>  * there is apparently no upstream gcc support for the architecture
>  * nobody has ever reported a bug or problem to us about it
> 
> This commit patches the unicore32 target to warn on startup that it
> is deprecated, and adds a note to our documentation's deprecation
> section.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> I proposed deprecation of unicore32 on 27th Feb:
> https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg06634.html
> and got several 'yes'es and no objections. This is the "changing
> the codebase" part of that, ready for the 2.12 codefreeze.
> 
> We should also note this in the 2.12 Changelog.
> ---
>  target/unicore32/cpu.c | 11 +++++++++++
>  qemu-doc.texi          |  5 +++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/target/unicore32/cpu.c b/target/unicore32/cpu.c
> index 29d160a88d..e95fa55b8e 100644
> --- a/target/unicore32/cpu.c
> +++ b/target/unicore32/cpu.c
> @@ -19,6 +19,8 @@
>  #include "migration/vmstate.h"
>  #include "exec/exec-all.h"
>  #include "fpu/softfloat.h"
> +#include "sysemu/qtest.h"
> +#include "qemu/error-report.h"
>  
>  static void uc32_cpu_set_pc(CPUState *cs, vaddr value)
>  {
> @@ -120,6 +122,15 @@ static void uc32_cpu_initfn(Object *obj)
>  #endif
>  
>      tlb_flush(cs);
> +
> +    /* We can't do this in class_init because the qtest_enabled
> +     * flag hasn't yet been initialized there. Luckily the Unicore32
> +     * machines don't support SMP so the message will only appear once.
> +     */
> +    if (!qtest_enabled()) {
> +        warn_report("qemu-system-unicore32 is deprecated "
> +                    "and will be removed in a future QEMU release.");
> +    }
>  }
>  
>  static const VMStateDescription vmstate_uc32_cpu = {
> diff --git a/qemu-doc.texi b/qemu-doc.texi
> index 39e38c87ec..0e8609c11c 100644
> --- a/qemu-doc.texi
> +++ b/qemu-doc.texi
> @@ -2779,6 +2779,11 @@ support page sizes < 4096 any longer.
>  The ``xlnx-ep108'' machine has been replaced by the ``xlnx-zcu102'' machine.
>  The ``xlnx-zcu102'' machine has the same features and capabilites in QEMU.
>  
> +@subsection Unicore32 targets (since 2.12.0)
> +
> +The ``unicore32'' CPU target and ``qemu-system-unicore32'' will be removed,
> +since this architecture is unmaintained.
> +
>  @node License
>  @appendix License

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
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