mm/hugetlb: convert cmdline parameters from setup to early

Convert the cmdline parameters (hugepagesz, hugepages, default_hugepagesz
and hugetlb_free_vmemmap) to early parameters.

Since parse_early_param might run before MMU setups on some platforms
(powerpc), validation of huge page sizes as specified in command line
parameters would fail.  So instead, for the hstate-related values, just
record the them and parse them on demand, from hugetlb_bootmem_alloc.

The allocation of hugetlb bootmem pages is now done in
hugetlb_bootmem_alloc, which is called explicitly at the start of
mm_core_init().  core_initcall would be too late, as that happens with
memblock already torn down.

This change will allow earlier allocation and initialization of bootmem
hugetlb pages later on.

No functional change intended.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Frank van der Linden <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Joao Martins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Roman Gushchin (Cruise) <[email protected]>
Cc: Usama Arif <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/mm/mm_init.c b/mm/mm_init.c
index c767946e8f5f..45bc4b55fd6a 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -30,6 +30,7 @@
 #include <linux/crash_dump.h>
 #include <linux/execmem.h>
 #include <linux/vmstat.h>
+#include <linux/hugetlb.h>
 #include "internal.h"
 #include "slab.h"
 #include "shuffle.h"
@@ -2641,6 +2642,8 @@ static void __init mem_init_print_info(void)
  */
 void __init mm_core_init(void)
 {
+	hugetlb_bootmem_alloc();
+
 	/* Initializations relying on SMP setup */
 	BUILD_BUG_ON(MAX_ZONELISTS > 2);
 	build_all_zonelists(NULL);