checkstack.pl: fix for aarch64

[ Upstream commit f1733a1d3cd32a9492f4cf866be37bb46e10163d ]

There is actually a space after "sp," like this,

    ffff2000080813c8:       a9bb7bfd        stp     x29, x30, [sp, #-80]!

Right now, checkstack.pl isn't able to print anything on aarch64,
because it won't be able to match the stating objdump line of a function
due to this missing space.  Hence, it displays every stack as zero-size.

After this patch, checkpatch.pl is able to match the start of a
function's objdump, and is then able to calculate each function's stack
correctly.

Link: http://lkml.kernel.org/r/20181207195843.38528-1-cai@lca.pw
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index 8081b6c..34414c6 100755 (executable)
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -47,8 +47,8 @@ my (@stack, $re, $dre, $x, $xs, $funcre);
        $xs     = "[0-9a-f ]";  # hex character or space
        $funcre = qr/^$x* <(.*)>:$/;
        if ($arch eq 'aarch64') {
-               #ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp,#-80]!
-               $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
+               #ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp, #-80]!
+               $re = qr/^.*stp.*sp, \#-([0-9]{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;