scripts/checkstack.pl: fix no space expression between sp and offset

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.
There is a space between sp and offset.

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.

Link: https://lkml.kernel.org/r/20231220073629.2658-1-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Casper Li <casper.li@mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index 8e04659ef4637dad442b84672a9d6d1908a1b863..14ce31f732ee8a9370ba0432143d3d8763b42a7d 100755 (executable)
--- 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