From: Alastair D'Silva <redacted>

This operation takes a significant amount of time when hotplugging
large amounts of memory (~50 seconds with 890GB of persistent memory).

This was orignally in commit fb5924fddf9e
("powerpc/mm: Flush cache on memory hot(un)plug") to support memtrace,
but the flush on add is not needed as it is flushed on remove.

Signed-off-by: Alastair D'Silva <redacted>
---
  arch/powerpc/mm/mem.c | 7 -------
  1 file changed, 7 deletions(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 854aaea2c6ae..2a14b5b93e19 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c

@@ -111,7 +111,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
  {
  	unsigned long start_pfn = start >> PAGE_SHIFT;
  	unsigned long nr_pages = size >> PAGE_SHIFT;
-	u64 i;
  	int rc;
  
  	resize_hpt_for_hotplug(memblock_phys_mem_size());

@@ -124,12 +123,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
  		return -EFAULT;
  	}
  
-	for (i = 0; i < size; i += FLUSH_CHUNK_SIZE) {
-		flush_dcache_range(start + i,
-				   min(start + size, start + i + FLUSH_CHUNK_SIZE));
-		cond_resched();
-	}
-