[PATCH 2/2] ARM: imx: bootaux: Fix LTO -Wlto-type-mismatch

[Marek Vasut <marex@denx.de>]

Commit 56c2dbdabab5 ("imx: bootaux: cleanup code") introduces the
following LTO related warning:

"
arch/arm/mach-imx/imx_bootaux.c:24:31: warning: type of ‘hostmap’ does not match original declaration [-Wlto-type-mismatch]
   24 | const __weak struct rproc_att hostmap[] = { };
      |                               ^
arch/arm/mach-imx/imx8m/soc.c:1590:24: note: array types have different bounds
 1590 | const struct rproc_att hostmap[] = {
      |                        ^
arch/arm/mach-imx/imx8m/soc.c:1590:24: note: ‘hostmap’ was previously declared here
../aarch64-linux-gnu/bin/ld: warning: u-boot has a LOAD segment with RWX permissions
"

This is because the weak empty array of structures "hostmap" is eventually
replaced by non-empty array of structures with different number of elements.
Fix this by avoiding weak variable size array, instead use a weak function
which returns single pointer to the array.

Fixes: 56c2dbdabab5 ("imx: bootaux: cleanup code")
Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: "NXP i.MX U-Boot Team" <uboot-imx@nxp.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Marek Behún <kabel@kernel.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
---
 arch/arm/include/asm/mach-imx/sys_proto.h | 2 ++
 arch/arm/mach-imx/imx8m/soc.c             | 5 +++++
 arch/arm/mach-imx/imx_bootaux.c           | 7 +++++--
 arch/arm/mach-imx/mx7/soc.c               | 5 +++++
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/mach-imx/sys_proto.h b/arch/arm/include/asm/mach-imx/sys_proto.h
index dd0d3f29333..27fdc16cd50 100644
--- a/arch/arm/include/asm/mach-imx/sys_proto.h
+++ b/arch/arm/include/asm/mach-imx/sys_proto.h
@@ -149,6 +149,8 @@ struct rproc_att {
 	u32 size; /* size of reg range */
 };
 
+const struct rproc_att *imx_bootaux_get_hostmap(void);
+
 struct rom_api {
 	u16 ver;
 	u16 tag;
diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index a4863281e36..5e92f8143cf 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -1610,4 +1610,9 @@ const struct rproc_att hostmap[] = {
 	{ 0x40000000, 0x40000000, 0x80000000 },
 	{ /* sentinel */ }
 };
+
+const struct rproc_att *imx_bootaux_get_hostmap(void)
+{
+	return hostmap;
+}
 #endif
diff --git a/arch/arm/mach-imx/imx_bootaux.c b/arch/arm/mach-imx/imx_bootaux.c
index 433c1f80cee..888c53d6901 100644
--- a/arch/arm/mach-imx/imx_bootaux.c
+++ b/arch/arm/mach-imx/imx_bootaux.c
@@ -21,11 +21,14 @@
 #define SRC_M4_REG_OFFSET		0
 #endif
 
-const __weak struct rproc_att hostmap[] = { };
+__weak const struct rproc_att *imx_bootaux_get_hostmap(void)
+{
+	return NULL;
+}
 
 static const struct rproc_att *get_host_mapping(unsigned long auxcore)
 {
-	const struct rproc_att *mmap = hostmap;
+	const struct rproc_att *mmap = imx_bootaux_get_hostmap();
 
 	while (mmap && mmap->size) {
 		if (mmap->da <= auxcore &&
diff --git a/arch/arm/mach-imx/mx7/soc.c b/arch/arm/mach-imx/mx7/soc.c
index 02af0d568f2..689dbefe8ee 100644
--- a/arch/arm/mach-imx/mx7/soc.c
+++ b/arch/arm/mach-imx/mx7/soc.c
@@ -224,6 +224,11 @@ const struct rproc_att hostmap[] = {
 	{ 0x80000000, 0x80000000, 0x60000000 }, /* DDRC */
 	{ /* sentinel */ }
 };
+
+const struct rproc_att *imx_bootaux_get_hostmap(void)
+{
+	return hostmap;
+}
 #endif
 
 #if !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT)
-- 
2.35.1