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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-11-24 12:33:07 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-12-18 14:59:19 +0100 |
| commit | 76cdd44c2e56ffabc297494c090c6babc8985998 (patch) | |
| tree | b737f0cbfa3fcbf1abf96d4e087f38194bddd8d1 /arch/s390/kernel/head64.S | |
| parent | 9552a66fe622ed53b87278a90917a37a5245e68a (diff) | |
| download | linux-stable-76cdd44c2e56ffabc297494c090c6babc8985998.tar.gz linux-stable-76cdd44c2e56ffabc297494c090c6babc8985998.tar.bz2 linux-stable-76cdd44c2e56ffabc297494c090c6babc8985998.zip | |
s390/facilities: always use lowcore's stfle field for storing facility bits
head.s contains an stfle instruction which stores it result at the
storage location that is assigned to the stfl instruction.
This is currently no problem, since we only care about one double
word. However if the number of double words in the ALS bitfield grows
the current code is not very stable.
E.g. before issuing the stfle command the memory to which it stores
must be cleared, since the instruction may or may not clear memory
contents where no bits are set.
In order to simplify the code a bit always use the storage location
that we reserved for the stfle result.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/head64.S')
| -rw-r--r-- | arch/s390/kernel/head64.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index 58b719fa8067..c5febe84eba6 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -16,7 +16,7 @@ __HEAD ENTRY(startup_continue) - tm __LC_STFL_FAC_LIST+6,0x80 # LPP available ? + tm __LC_STFLE_FAC_LIST+6,0x80 # LPP available ? jz 0f xc __LC_LPP+1(7,0),__LC_LPP+1 # clear lpp and current_pid mvi __LC_LPP,0x80 # and set LPP_MAGIC |