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Am 29.05.22 um 22:33 schrieb Heiko Carstens:
[...]
Guess the patch below on top of your patch is what we want.
Just for clarification: if gmap is not NULL then the process is a kvm
process. So, depending on the workload, this optimization makes sense.
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 4608cc962ecf..e1d40ca341b7 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -436,12 +436,11 @@ static inline vm_fault_t do_exception(struct pt_regs
*regs, int access)
/* The fault is fully completed (including releasing mmap lock) */
if (fault & VM_FAULT_COMPLETED) {
- /*
- * Gmap will need the mmap lock again, so retake it. TODO:
- * only conditionally take the lock when CONFIG_PGSTE set.
- */
- mmap_read_lock(mm);
- goto out_gmap;
+ if (gmap) {
+ mmap_read_lock(mm);
+ goto out_gmap;
+ }
+ goto out;
Yes, that makes sense. With that
Acked-by: Christian Borntraeger <borntrae...@linux.ibm.com>
