xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

s390/alternative: use a copy of the facility bit mask

Browse Source 
To be able to switch off specific CPU alternatives with kernel parameters
make a copy of the facility bit mask provided by STFLE and use the copy
for the decision to apply an alternative.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2018-01-16 07:03:44 +01:00
parent e2dd833389
commit cf14899846
6 changed files with 31 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/s390/kernel/alternative.c
View File

@@ -75,7 +75,8 @@ static void __init_or_module __apply_alternatives(struct alt_instr *start,
instr = (u8 *)&a->instr_offset + a->instr_offset;
replacement = (u8 *)&a->repl_offset + a->repl_offset;
if (!test_facility(a->facility))
if (!__test_facility(a->facility,
S390_lowcore.alt_stfle_fac_list))
continue;
if (unlikely(a->instrlen % 2 || a->replacementlen % 2)) {