KVM: s390: Replace get_zeroed_page() with kzalloc() for the STHYI buffer

handle_sthyi() allocates the buffer that receives the STHYI response
block before it is copied to the guest.

This buffer can be allocated with kmalloc() as there's nothing special
about it to go directly to the page allocator.

kmalloc() provides a better API that does not require ugly casts and
kfree() does not need to know the size of the freed object.

Performance difference between kmalloc() and __get_free_pages() is not
measurable as both allocators take an object/page from a per-CPU list for
fast path allocations.

For the slow path the performance is anyway determined by the amount of
reclaim involved rather than by what allocator is used.

The only goto in that function does not unwind anything, it merely skips
to the exit when the function code is invalid. Turn it into an early
return so that the buffer can be freed with __free(kfree).

Replace use of get_zeroed_page() with kzalloc() and free_page() with
kfree().

Assisted-by: copilot:claude-opus
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

0 files changed, 0 insertions, 0 deletions