Hi,
On Tue, Apr 07, 2015 at 05:36:08PM +0100, Maciej W. Rozycki wrote:
> On Thu, 26 Feb 2015, Markos Chandras wrote:
> > Set good default FPU flags (FR0) for O32 binaries similar to what the
> > kernel does for the N64/N32 ones. This also fixes a regression
> > introduced in commit 46490b572544 ("MIPS: kernel: elf: Improve the
> > overall ABI and FPU mode checks") when MIPS_O32_FP64_SUPPORT is
> > disabled. In that case, the mips_set_personality_fp() did not set the
> > FPU mode at all because it assumed that the FPU mode was already set
> > properly. That led to O32 userland problems.
> >
> > Cc: Matthew Fortune <Matthew.Fortune@xxxxxxxxxx>
> > Cc: Paul Burton <paul.burton@xxxxxxxxxx>
> > Reported-by: Mans Rullgard <mans@xxxxxxxxx>
> > Fixes: 46490b572544 ("MIPS: kernel: elf: Improve the overall ABI and FPU mode checks")
> > Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
> > ---
>
> Can you please backport this change to 4.0 ASAP, preferably before it
> hits the actual release?
>
> It fixes a 3.19->4.0 regression, likely affecting all FPU processors and
> wreaking havoc. For example I came across a system that boots 3.19 just
> fine, but hangs in `ypbind' with 4.0. It works again with this change
> applied.
It seems this patch, and some other fixes for fatal regressions,
missed 4.0, although they were reported right after the -rc1 was out.
Basically 4.0 is unusable for MIPS users.
:-(
A.
