The patch titled Subject: checkstack: fix printed address has been added to the -mm mm-hotfixes-unstable branch. Its filename is checkstack-fix-printed-address.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Heiko Carstens hca@linux.ibm.com Subject: checkstack: fix printed address Date: Mon, 20 Nov 2023 19:37:17 +0100

All addresses printed by checkstack have an extra incorrect 0 appended at the end.

This was introduced with commit 677f1410e058 ("scripts/checkstack.pl: don't display $dre as different entity"): since then the address is taken from the line which contains the function name, instead of the line which contains stack consumption. E.g. on s390:

0000000000100a30 <do_one_initcall>: ... 100a44: e3 f0 ff 70 ff 71 lay %r15,-144(%r15)

So the used regex which matches spaces and hexadecimal numbers to extract an address now matches a different substring. Subsequently replacing spaces with 0 appends a zero at the and, instead of replacing leading spaces.

Fix this by using the proper regex, and simplify the code a bit.

Link: https://lkml.kernel.org/r/20231120183719.2188479-2-hca@linux.ibm.com Fixes: 677f1410e058 ("scripts/checkstack.pl: don't display $dre as different entity") Signed-off-by: Heiko Carstens hca@linux.ibm.com Cc: Maninder Singh maninder1.s@samsung.com Cc: Masahiro Yamada masahiroy@kernel.org Cc: Vaneet Narang v.narang@samsung.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

scripts/checkstack.pl | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/scripts/checkstack.pl~checkstack-fix-printed-address +++ a/scripts/checkstack.pl @@ -139,15 +139,11 @@ $total_size = 0; while (my $line = <STDIN>) { if ($line =~ m/$funcre/) { $func = $1; - next if $line !~ m/^($xs*)/; + next if $line !~ m/^($x*)/; if ($total_size > $min_stack) { push @stack, "$intro$total_size\n"; } - - $addr = $1; - $addr =~ s/ /0/g; - $addr = "0x$addr"; - + $addr = "0x$1"; $intro = "$addr $func [$file]:"; my $padlen = 56 - length($intro); while ($padlen > 0) { _

Patches currently in -mm which might be from hca@linux.ibm.com are

checkstack-fix-printed-address.patch checkstack-sort-output-by-size-and-function-name.patch checkstack-allow-to-pass-minstacksize-parameter.patch arch-remove-arch_thread_stack_allocator.patch arch-remove-arch_task_struct_allocator.patch arch-remove-arch_task_struct_on_stack.patch