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| /openbmc/linux/arch/s390/boot/ |
| H A D | ipl_parm.c | 88c2510c Mon Jun 14 07:49:31 CDT 2021 Heiko Carstens <hca@linux.ibm.com> s390/ipl_parm: fix program check new psw handling
The __diag308() inline asm temporarily changes the program check new
psw to redirect a potential program check on the diag instruction.
Restoring of the program check new psw is done in C code behind the
inline asm.
This can be problematic, especially if the function is inlined, since
the compiler can reorder instructions in such a way that a different
instruction, which may result in a program check, might be executed
before the program check new psw has been restored.
To avoid such a scenario move restoring into the inline asm. For
consistency reasons move also saving of the original program check new
psw into the inline asm.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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