Re: [PATCH]: MIPS: Select CONFIG_MIPS_O32_FP64_SUPPORT if 64bit kernel and o32

[Joshua Kinard <kumba@gentoo.org>]

On 04/01/2015 04:01, Markos Chandras wrote:
> On 04/01/2015 07:49 AM, Joshua Kinard wrote:
>> From: Joshua Kinard <kumba@gentoo.org>
>>
>> Select CONFIG_MIPS_O32_FP64_SUPPORT by default if CONFIG_64BIT and
>> CONFIG_MIPS32_O32 are selected.  This avoids breaking things when
>> booting into an o32 userland under a 64bit kernel.  Symptoms of not
>> selecting CONFIG_MIPS_O32_FP64_SUPPORT can include OpenSSH claiming that
>> the "PRNG is not seeded" and Python programs to fail with either a
>> SIGSEGV or errors regarding "float NaN".
>>
>> Signed-off-by: Joshua Kinard <kumba@gentoo.org>
>> ---
>>  arch/mips/Kconfig |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> mips-fix-o32-fp64-on-mips64.patch
>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
>> index 294f82e..1b826ed 100644
>> --- a/arch/mips/Kconfig
>> +++ b/arch/mips/Kconfig
>> @@ -2736,6 +2736,7 @@ config MIPS32_O32
>>  	select COMPAT
>>  	select MIPS32_COMPAT
>>  	select SYSVIPC_COMPAT if SYSVIPC
>> +	select MIPS_O32_FP64_SUPPORT if 64BIT
>>  	help
>>  	  Select this option if you want to run o32 binaries.  These are pure
>>  	  32-bit binaries as used by the 32-bit Linux/MIPS port.  Most of
>>
>>
> Hi,
> 
> No this is not a good solution. This has already been fixed in
> mips-for-linux-next and might make it to 4.0 in time
> 
> https://patchwork.linux-mips.org/patch/9344/
> 
> can you try that patch instead?

This appears to fix the problem.  I definitely suggest this get into 4.0, or
some machines out there are going to break if CONFIG_MIPS_O32_FP64_SUPPORT
isn't selected.  This one was stumping me for a few hours last night...

Thanks!,

--J