[PATCH] KVM: s390: arm64: Tolerate unused functions in extracted source

[Andreas Grapentin <gra@linux.ibm.com>]

Extracting static declared arm64 functions with no consumer on the s390
side into the generated sources causes compiler warnings when subsuming
the generated sources from s390. This causes spurious compiler warnings
that make it harder to extract larger, more cohesive portions of the
arm64 source.

Update the extraction logic to wrap the extracted source into diagnostic
pragmas to disable -Wunused-function for the extracted block. This
allows us to share more freely, and also opens up more paths for future
code sharing with a separation of extraction and definition of consumers
in separate commits.

Obviously no functional change intended.

Signed-off-by: Andreas Grapentin <gra@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
---
 arch/s390/kvm/arm64/copy-arm64c.awk | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/s390/kvm/arm64/copy-arm64c.awk b/arch/s390/kvm/arm64/copy-arm64c.awk
index 640a7bcb7e23..a318be97c419 100644
--- a/arch/s390/kvm/arm64/copy-arm64c.awk
+++ b/arch/s390/kvm/arm64/copy-arm64c.awk
@@ -42,6 +42,9 @@ BEGIN {
 	print "#endif /* __INCL_GEN_ARM_FILE */"
 	print "#undef __INCL_GEN_ARM_FILE"
 	print ""
+	print "__diag_push()"
+	print "__diag_ignore_all(\"-Wunused-function\", \"tolerate unused functions shared from arm64\")"
+	print ""
 
 	file_header_done = 1
 }
@@ -78,5 +81,10 @@ copying {
 }
 
 END {
-	exit error || !found_marker || copying
+	ok = !error && found_marker && !copying
+	if (ok) {
+		print ""
+		print "__diag_pop()"
+	}
+	exit !ok
 }

---
base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
change-id: 20261105-series1-fixups2-8ce6cc54a21f

Best regards,
-- 
Andreas Grapentin <gra@linux.ibm.com>