[U-Boot] [PATCH] initcall: Move to inline function

[Alexander Graf]

The board_r init function was complaining that we are looping through
an array, calling all our tiny init stubs sequentially via indirect
function calls (which can't be speculated, so they are slow).

The solution to that is pretty easy though. All we need to do is inline
the function that loops through the functions and the compiler will
automatically convert almost all indirect calls into direct inlined code.

With this patch, the overall code size drops (by 40 bytes on riscv64)
and boot time should become measurably faster for every target.

Signed-off-by: Alexander Graf <agraf at suse.de>
---
 common/board_r.c   |  5 +----
 include/initcall.h | 35 ++++++++++++++++++++++++++++++++++-
 lib/Makefile       |  1 -
 lib/initcall.c     | 39 ---------------------------------------
 4 files changed, 35 insertions(+), 45 deletions(-)
 delete mode 100644 lib/initcall.c

diff --git a/common/board_r.c b/common/board_r.c
index 5f3d27aa9f..472987d5d5 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -633,10 +633,7 @@ static int run_main_loop(void)
 }
 
 /*
- * Over time we hope to remove these functions with code fragments and
- * stub functions, and instead call the relevant function directly.
- *
- * We also hope to remove most of the driver-related init and do it if/when
+ * We hope to remove most of the driver-related init and do it if/when
  * the driver is later used.
  *
  * TODO: perhaps reset the watchdog in the initcall function after each call?
diff --git a/include/initcall.h b/include/initcall.h
index 01f3f2833f..3ac01aa2cd 100644
--- a/include/initcall.h
+++ b/include/initcall.h
@@ -8,6 +8,39 @@
 
 typedef int (*init_fnc_t)(void);
 
-int initcall_run_list(const init_fnc_t init_sequence[]);
+#include <common.h>
+#include <initcall.h>
+#include <efi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static inline int initcall_run_list(const init_fnc_t init_sequence[])
+{
+	const init_fnc_t *init_fnc_ptr;
+
+	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
+		unsigned long reloc_ofs = 0;
+		int ret;
+
+		if (gd->flags & GD_FLG_RELOC)
+			reloc_ofs = gd->reloc_off;
+#ifdef CONFIG_EFI_APP
+		reloc_ofs = (unsigned long)image_base;
+#endif
+		debug("initcall: %p", (char *)*init_fnc_ptr - reloc_ofs);
+		if (gd->flags & GD_FLG_RELOC)
+			debug(" (relocated to %p)\n", (char *)*init_fnc_ptr);
+		else
+			debug("\n");
+		ret = (*init_fnc_ptr)();
+		if (ret) {
+			printf("initcall sequence %p failed at call %p (err=%d)\n",
+			       init_sequence,
+			       (char *)*init_fnc_ptr - reloc_ofs, ret);
+			return -1;
+		}
+	}
+	return 0;
+}
 
 #endif
diff --git a/lib/Makefile b/lib/Makefile
index 61d7ff0678..47829bfed5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,7 +35,6 @@ obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
 obj-$(CONFIG_GZIP_COMPRESSED) += gzip.o
 obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += smbios.o
 obj-$(CONFIG_IMAGE_SPARSE) += image-sparse.o
-obj-y += initcall.o
 obj-y += ldiv.o
 obj-$(CONFIG_MD5) += md5.o
 obj-y += net_utils.o
diff --git a/lib/initcall.c b/lib/initcall.c
deleted file mode 100644
index 8f1dac68e4..0000000000
--- a/lib/initcall.c
+++ /dev/null
@@ -1,39 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (c) 2013 The Chromium OS Authors.
- */
-
-#include <common.h>
-#include <initcall.h>
-#include <efi.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-int initcall_run_list(const init_fnc_t init_sequence[])
-{
-	const init_fnc_t *init_fnc_ptr;
-
-	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
-		unsigned long reloc_ofs = 0;
-		int ret;
-
-		if (gd->flags & GD_FLG_RELOC)
-			reloc_ofs = gd->reloc_off;
-#ifdef CONFIG_EFI_APP
-		reloc_ofs = (unsigned long)image_base;
-#endif
-		debug("initcall: %p", (char *)*init_fnc_ptr - reloc_ofs);
-		if (gd->flags & GD_FLG_RELOC)
-			debug(" (relocated to %p)\n", (char *)*init_fnc_ptr);
-		else
-			debug("\n");
-		ret = (*init_fnc_ptr)();
-		if (ret) {
-			printf("initcall sequence %p failed at call %p (err=%d)\n",
-			       init_sequence,
-			       (char *)*init_fnc_ptr - reloc_ofs, ret);
-			return -1;
-		}
-	}
-	return 0;
-}
-- 
2.12.3