[PATCH] checkstack.pl: dynamic stack growth for aarch64

[Qian Cai]

This is to track dynamic amount of stack growth for aarch64, so it is
possible to print out offensive functions that may consume too much
stack. For example,

0xffff2000084d1270 try_to_unmap_one [vmlinux]:		Dynamic (0xcf0)
0xffff200008538358 migrate_page_move_mapping [vmlinux]:	Dynamic (0xc60)
0xffff2000081276c8 copy_process.isra.2 [vmlinux]:	Dynamic (0xb20)
0xffff200008424958 show_free_areas [vmlinux]:		Dynamic (0xb40)
0xffff200008545178 __split_huge_pmd_locked [vmlinux]:	Dynamic (0xb30)
0xffff200008555120 collapse_shmem [vmlinux]:		Dynamic (0xbc0)
0xffff20000862e0d0 do_direct_IO [vmlinux]:		Dynamic (0xb70)
0xffff200008cc0aa0 md_do_sync [vmlinux]:		Dynamic (0xb90)

Signed-off-by: Qian Cai <cai@xxxxxx>
---
 scripts/checkstack.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index 34414c6efad6..122aef5e4e14 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -48,7 +48,9 @@ my (@stack, $re, $dre, $x, $xs, $funcre);
 	$funcre = qr/^$x* <(.*)>:$/;
 	if ($arch eq 'aarch64') {
 		#ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp, #-80]!
+		#a110:       d11643ff        sub     sp, sp, #0x590
 		$re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
+		$dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o;
 	} elsif ($arch eq 'arm') {
 		#c0008ffc:	e24dd064	sub	sp, sp, #100	; 0x64
 		$re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
-- 
2.17.2 (Apple Git-113)