[PATCH v2 07/14] s390: Handle KCOV __init vs inline mismatches

From: Kees Cook <kees@kernel.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Kees Cook <kees@kernel.org>, Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Gaosheng Cui <cuigaosheng1@huawei.com>,
	linux-s390@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Christoph Hellwig <hch@lst.de>, Marco Elver <elver@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nicolas Schier <nicolas.schier@linux.dev>,
	Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	kasan-dev@googlegroups.com, linux-doc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	linux-riscv@lists.infradead.org, linux-efi@vger.kernel.org,
	linux-hardening@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kselftest@vger.kernel.org, sparclinux@vger.kernel.org,
	llvm@lists.linux.dev
Subject: [PATCH v2 07/14] s390: Handle KCOV __init vs inline mismatches
Date: Thu, 22 May 2025 21:39:17 -0700	[thread overview]
Message-ID: <20250523043935.2009972-7-kees@kernel.org> (raw)
In-Reply-To: <20250523043251.it.550-kees@kernel.org>

When KCOV is enabled all functions get instrumented, unless
the __no_sanitize_coverage attribute is used. To prepare for
__no_sanitize_coverage being applied to __init functions, we have to
handle differences in how GCC's inline optimizations get resolved. For
s390 this exposed a place where the __init annotation was missing but
ended up being "accidentally correct". Fix this cases and force a couple
functions to be inline with __always_inline.

Signed-off-by: Kees Cook <kees@kernel.org>
---
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: <linux-s390@vger.kernel.org>
---
 arch/s390/hypfs/hypfs.h      | 2 +-
 arch/s390/hypfs/hypfs_diag.h | 2 +-
 arch/s390/mm/init.c          | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
index 83ebf54cca6b..4dc2e068e0ff 100644
--- a/arch/s390/hypfs/hypfs.h
+++ b/arch/s390/hypfs/hypfs.h
@@ -48,7 +48,7 @@ void hypfs_sprp_exit(void);
 
 int __hypfs_fs_init(void);
 
-static inline int hypfs_fs_init(void)
+static __always_inline int hypfs_fs_init(void)
 {
 	if (IS_ENABLED(CONFIG_S390_HYPFS_FS))
 		return __hypfs_fs_init();
diff --git a/arch/s390/hypfs/hypfs_diag.h b/arch/s390/hypfs/hypfs_diag.h
index 7090eff27fef..b5218135b8fe 100644
--- a/arch/s390/hypfs/hypfs_diag.h
+++ b/arch/s390/hypfs/hypfs_diag.h
@@ -19,7 +19,7 @@ int diag204_store(void *buf, int pages);
 int __hypfs_diag_fs_init(void);
 void __hypfs_diag_fs_exit(void);
 
-static inline int hypfs_diag_fs_init(void)
+static __always_inline int hypfs_diag_fs_init(void)
 {
 	if (IS_ENABLED(CONFIG_S390_HYPFS_FS))
 		return __hypfs_diag_fs_init();
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index afa085e8186c..0f83c82af7a6 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -143,7 +143,7 @@ bool force_dma_unencrypted(struct device *dev)
 }
 
 /* protected virtualization */
-static void pv_init(void)
+static void __init pv_init(void)
 {
 	if (!is_prot_virt_guest())
 		return;
-- 
2.34.1

