[PATCH v3 2/3] checkpatch: Ignore <inttypes.h> format macros for userspace tools

[Petr Vorel <pvorel@suse.cz>]

Constants from <inttypes.h> are used only in userspace tools, they are
from ISO C99, let's don't report it:

    arch/mips/boot/tools/relocs.c:572: CHECK: Avoid CamelCase: <PRIx32>
    arch/s390/tools/relocs.c:52: CHECK: Avoid CamelCase: <PRIu64>
    tools/testing/selftests/mm/vm_util.c:244: CHECK: Avoid CamelCase: <SCNu64>

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Changes v2->v3:
* Fix unintentional disablement of CamelCase warnings on non-userspace
  sources (sashiko).

Link to v2:
https://lore.kernel.org/lkml/20260519162004.81665-1-pvorel@suse.cz/
https://sashiko.dev/#/patchset/20260519162004.81665-1-pvorel%40suse.cz

 scripts/checkpatch.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 663064f32dae..60da43b00d55 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5945,6 +5945,8 @@ sub process {
 #Ignore SI style variants like nS, mV and dB
 #(ie: max_uV, regulator_min_uA_show, RANGE_mA_VALUE)
 			    $var !~ /^(?:[a-z0-9_]*|[A-Z0-9_]*)?_?[a-z][A-Z](?:_[a-z0-9_]+|_[A-Z0-9_]+)?$/ &&
+#Ignore <inttypes.h> format macros (e.g. PRIu64, SCNu64)
+			    (is_userspace($realfile) ? $var !~ /^(?:PRI|SCN)[dioux][A-Z0-9]+$/ : 1) &&
 #Ignore some three character SI units explicitly, like MiB and KHz
 			    $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
 				while ($var =~ m{\b($Ident)}g) {
-- 
2.54.0