[PATCH] scripts: Fix no space expression between sp and offset

[Kuan-Ying Lee]

When I use older version aarch64 objdump (2.24) to disassemble
aarch64 vmlinux, I get the result like below.
There is no space between sp and offset.

ffff800008010000 <dw_apb_ictl_handle_irq>:
ffff800008010000:       d503233f        hint    #0x19
ffff800008010004:       a9bc7bfd        stp     x29, x30, [sp,#-64]!
ffff800008010008:       90011e60        adrp    x0, ffff80000a3dc000 <num_ictlrs>
ffff80000801000c:       910003fd        mov     x29, sp
ffff800008010010:       a9025bf5        stp     x21, x22, [sp,#32]

When I use newer version aarch64 objdump (2.35), I get
the result like below.

ffff800008010000 <dw_apb_ictl_handle_irq>:
ffff800008010000:       d503233f        paciasp
ffff800008010004:       a9bc7bfd        stp     x29, x30, [sp, #-64]!
ffff800008010008:       90011e60        adrp    x0, ffff80000a3dc000 <num_ictlrs>
ffff80000801000c:       910003fd        mov     x29, sp
ffff800008010010:       a9025bf5        stp     x21, x22, [sp, #32]

Add no space support of regular expression for old version objdump.

Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
---
 scripts/checkstack.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index d2c38584ece6..e404b6b11295 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -56,7 +56,7 @@ my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);
 	if ($arch =~ '^(aarch|arm)64$') {
 		#ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp, #-80]!
 		#a110:       d11643ff        sub     sp, sp, #0x590
-		$re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
+		$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
-- 
2.18.0