From fd3190c2da0fa34139888ed0f82fb49f8011ab47 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 14 Nov 2023 18:37:25 -0800
Subject: [PATCH] sys: Disable -Walloc-size-larger-than for GCC 9+

By default this warns about sizes larger than PTRDIFF_MAX passed to
malloc (rather than SIZE_MAX).  This doesn't trigger
deterministically, but it does trigger for kmalloc() of struct_size()
in iwlwifi's iwl_configure_rxq even when struct_size() is changed to
use PTRDIFF_MAX.  NB: struct_size() in Linux caps the size at
SIZE_MAX, not PTRDIFF_MAX via size_mul().

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D42587

(cherry picked from commit ede077bf2a259c23923d1ab1231dc8c4577e6672)
---
 sys/conf/kern.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index dcaacbf831c..6cc22a44f51 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -76,6 +76,7 @@ CWARNEXTRA+=	-Wno-error=packed-not-aligned
 .endif
 .if ${COMPILER_VERSION} >= 90100
 CWARNEXTRA+=	-Wno-address-of-packed-member			\
+		-Wno-alloc-size-larger-than			\
 		-Wno-error=alloca-larger-than=
 .if ${COMPILER_VERSION} >= 120100
 CWARNEXTRA+=	-Wno-error=nonnull				\