+ scripts-checkstackpl-support-llvm-objdump-disassembly-for-x86.patch added to mm-nonmm-unstable branch

+ scripts-checkstackpl-support-llvm-objdump-disassembly-for-x86.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: scripts/checkstack.pl: support llvm-objdump disassembly for x86
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     scripts-checkstackpl-support-llvm-objdump-disassembly-for-x86.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-checkstackpl-support-llvm-objdump-disassembly-for-x86.patch

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

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------------------------------------------------------
From: Nick Desaulniers <ndesaulniers@google.com>
Subject: scripts/checkstack.pl: support llvm-objdump disassembly for x86
Date: Wed, 02 Sep 2026 14:01:53 -0700

When running `make LLVM=1 checkstack`, OBJDUMP is set to llvm-objdump. 
llvm-objdump outputs disassembly with instruction size suffixes (such as
subq/addq/subl/addl), tabs/whitespace differences, spaces after commas,
and trailing comments (e.g.  `# imm = 0x...`).

Because scripts/checkstack.pl used rigid regular expressions specifically
tuned to GNU objdump format (e.g.  requiring exactly four spaces, no
suffix, and no space after comma), checkstack.pl failed to match any stack
adjustment instructions and yielded no output when using llvm-objdump on
x86.

Update the regular expressions for x86 to match optional suffixes,
variable whitespace, and trailing comments.

Link: https://lore.kernel.org/20260902-checkstack_llvm_objdump-v1-1-edb4eca5f163@google.com
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Assisted-by: LLM Gemini
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/checkstack.pl |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/scripts/checkstack.pl~scripts-checkstackpl-support-llvm-objdump-disassembly-for-x86
+++ a/scripts/checkstack.pl
@@ -66,8 +66,10 @@ my (@stack, $re, $dre, $sub, $x, $xs, $f
 		#c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
 		# or
 		#    2f60:    48 81 ec e8 05 00 00       sub    $0x5e8,%rsp
-		$re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%(e|r)sp$/o;
-		$dre = qr/^.*[as][du][db]    (%.*),\%(e|r)sp$/o;
+		# or
+		#       0: 48 81 ec e8 05 00 00          subq   $0x5e8, %rsp
+		$re = qr/^.*[as][du][db][ql]?\s+\$(0x$x{1,8}),\s*\%(e|r)sp/o;
+		$dre = qr/^.*[as][du][db][ql]?\s+(%.*),\s*\%(e|r)sp/o;
 	} elsif ($arch eq 'm68k') {
 		#    2b6c:       4e56 fb70       linkw %fp,#-1168
 		#  1df770:       defc ffe4       addaw #-28,%sp
_

Patches currently in -mm which might be from ndesaulniers@google.com are

scripts-checkstackpl-support-llvm-objdump-disassembly-for-x86.patch