Fix Clang 15 compilation errors

- Clang 15 doesn't support `-fno-ipa-sra` anymore. Do a separate
  check for `-fno-ipa-sra` support by $KERNEL_CC.

- Don't enable `-mgeneral-regs-only` for certain module files.
  Fix #13260

- Scope `GCC diagnostic ignored` statements to GCC only. Clang
  doesn't need them to compile the code.

Reviewed-by: Richard Yao <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: szubersk <[email protected]>
Closes #13260
Closes #14150

6 files changed, 21 insertions, 2 deletions

diff --git a/module/Kbuild.in b/module/Kbuild.in
index 581d50e64..a39f9d9d0 100644
--- a/module/Kbuild.in
+++ b/module/Kbuild.in
@@ -42,6 +42,12 @@ endif
 asflags-y := $(ZFS_MODULE_CFLAGS) $(ZFS_MODULE_CPPFLAGS)
 ccflags-y := $(ZFS_MODULE_CFLAGS) $(ZFS_MODULE_CPPFLAGS)
 
+ifeq ($(CONFIG_ARM64),y)
+CFLAGS_REMOVE_zcommon/zfs_fletcher_aarch64_neon.o += -mgeneral-regs-only
+CFLAGS_REMOVE_zfs/vdev_raidz_math_aarch64_neon.o += -mgeneral-regs-only
+CFLAGS_REMOVE_zfs/vdev_raidz_math_aarch64_neonx2.o += -mgeneral-regs-only
+endif
+
 # Suppress unused-value warnings in sparc64 architecture headers
 ccflags-$(CONFIG_SPARC64) += -Wno-unused-value
 
diff --git a/module/icp/algs/edonr/edonr.c b/module/icp/algs/edonr/edonr.c
index 345133d74..b1f710cc0 100644
--- a/module/icp/algs/edonr/edonr.c
+++ b/module/icp/algs/edonr/edonr.c
@@ -346,9 +346,11 @@ Q256(size_t bitlen, const uint32_t *data, uint32_t *restrict p)
  * which only goes over it by a hair (1248 bytes on ARM32).
  */
 #include <sys/isa_defs.h>	/* for _ILP32 */
-#ifdef _ILP32   /* We're 32-bit, assume small stack frames */
+#if defined(_ILP32)   /* We're 32-bit, assume small stack frames */
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic ignored "-Wframe-larger-than="
 #endif
+#endif
 
 #if defined(__IBMC__) && defined(_AIX) && defined(__64BIT__)
 static inline size_t
diff --git a/module/icp/algs/skein/skein_block.c b/module/icp/algs/skein/skein_block.c
index 7ba165a48..3ad52da5f 100644
--- a/module/icp/algs/skein/skein_block.c
+++ b/module/icp/algs/skein/skein_block.c
@@ -30,7 +30,9 @@
  * the #pragma here to ignore the warning.
  */
 #if defined(_ILP32) || defined(__powerpc)	/* Assume small stack */
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic ignored "-Wframe-larger-than="
+#endif
 /*
  * We're running on 32-bit, don't unroll loops to save stack frame space
  *
diff --git a/module/lua/ldo.c b/module/lua/ldo.c
index e2a3d0279..291bca044 100644
--- a/module/lua/ldo.c
+++ b/module/lua/ldo.c
@@ -197,7 +197,8 @@ l_noret luaD_throw (lua_State *L, int errcode) {
   }
 }
 
-#if defined(HAVE_INFINITE_RECURSION)
+#if defined(__GNUC__) && !defined(__clang__) && \
+	defined(HAVE_INFINITE_RECURSION)
 #pragma GCC diagnostic pop
 #endif
 
diff --git a/module/os/linux/spl/spl-generic.c b/module/os/linux/spl/spl-generic.c
index 71eedf635..38515023e 100644
--- a/module/os/linux/spl/spl-generic.c
+++ b/module/os/linux/spl/spl-generic.c
@@ -254,8 +254,10 @@ __div_u64(uint64_t u, uint32_t v)
  * replacements for libgcc-provided functions and will never be called
  * directly.
  */
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
+#endif
 
 /*
  * Implementation of 64-bit unsigned division for 32-bit machines.
@@ -449,7 +451,9 @@ __aeabi_ldivmod(int64_t u, int64_t v)
 EXPORT_SYMBOL(__aeabi_ldivmod);
 #endif /* __arm || __arm__ */
 
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic pop
+#endif
 
 #endif /* BITS_PER_LONG */
 
diff --git a/module/zfs/vdev_raidz_math_aarch64_neonx2.c b/module/zfs/vdev_raidz_math_aarch64_neonx2.c
index 0a1f05fd6..bd9de91a4 100644
--- a/module/zfs/vdev_raidz_math_aarch64_neonx2.c
+++ b/module/zfs/vdev_raidz_math_aarch64_neonx2.c
@@ -210,9 +210,13 @@ DEFINE_GEN_METHODS(aarch64_neonx2);
  * If compiled with -O0, gcc doesn't do any stack frame coalescing
  * and -Wframe-larger-than=1024 is triggered in debug mode.
  */
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic ignored "-Wframe-larger-than="
+#endif
 DEFINE_REC_METHODS(aarch64_neonx2);
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic pop
+#endif
 
 static boolean_t
 raidz_will_aarch64_neonx2_work(void)