Re: [PATCH v3] tty: Partially revert the removal of the Cyclades public API

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On Wed, Jan 26, 2022 at 09:22:54AM +0000, Maciej W. Rozycki wrote:
> Fix a user API regression introduced with commit f76edd8f7ce0 ("tty: 
> cyclades, remove this orphan"), which removed a part of the API and 
> caused compilation errors for user programs using said part, such as 
> GCC 9 in its libsanitizer component[1]:
> 
> .../libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:160:10: fatal error: linux/cyclades.h: No such file or directory
>   160 | #include <linux/cyclades.h>
>       |          ^~~~~~~~~~~~~~~~~~
> compilation terminated.
> make[4]: *** [Makefile:664: sanitizer_platform_limits_posix.lo] Error 1
> 
> As the absolute minimum required bring `struct cyclades_monitor' and 
> ioctl numbers back then so as to make the library build again.  Add a 
> preprocessor warning as to the obsolescence of the features provided.
> 
> References:
> 
> [1] GCC PR sanitizer/100379, "cyclades.h is removed from linux kernel 
>     header files", <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100379>
> 
> Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxx>
> Fixes: f76edd8f7ce0 ("tty: cyclades, remove this orphan")
> Cc: stable@xxxxxxxxxxxxxxx # v5.13+
> ---
> Changes from v2:
> 
> - Add #warning directives.

Thanks, that looks good, now queued up.

greg k-h



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