tree 25303d5c72148d89611f75023b362200d1122a3a
parent 3acf4e395260e3bd30a6fa29ba7eada4bf7566ca
author Philipp Rudo <prudo@linux.ibm.com> 1526472392 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1526621075 +0200

s390/purgatory: Fix endless interrupt loop

New compilers use the floating-point registers as spill registers when
there is high register pressure. In the purgatory however, the afp control
bit is not set. This leads to an exception whenever a floating-point
instruction is used, which again causes an interrupt loop.

Forbid the compiler to use floating-point instructions by adding
-msoft-float to KBUILD_CFLAGS.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Fixes: 840798a1f529 (s390/kexec_file: Add purgatory)
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>