memblock tests: fix build errors

* add stubs to functions that calls to them were recently added to memblock
 but they were missing in tests
 * update gfp_types.h to include bits.h so that BIT() definitions won't
 depend on other includes
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Merge tag 'fixes-2024-04-08' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

Pull memblock fixes from Mike Rapoport:
 "Fix build errors in memblock tests:

   - add stubs to functions that calls to them were recently added to
     memblock but they were missing in tests

   - update gfp_types.h to include bits.h so that BIT() definitions
     won't depend on other includes"

* tag 'fixes-2024-04-08' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  memblock tests: fix undefined reference to `BIT'
  memblock tests: fix undefined reference to `panic'
  memblock tests: fix undefined reference to `early_pfn_to_nid'

include/linux/gfp_types.h

@@ -2,6 +2,8 @@
 #ifndef __LINUX_GFP_TYPES_H
 #define __LINUX_GFP_TYPES_H
 
+#include <linux/bits.h>
+
 /* The typedef is in types.h but we want the documentation here */
 #if 0
 /**

tools/include/linux/kernel.h

@@ -8,6 +8,7 @@
 #include <linux/build_bug.h>
 #include <linux/compiler.h>
 #include <linux/math.h>
+#include <linux/panic.h>
 #include <endian.h>
 #include <byteswap.h>
 

tools/include/linux/mm.h

@@ -37,4 +37,9 @@ static inline void totalram_pages_add(long count)
 {
 }
 
+static inline int early_pfn_to_nid(unsigned long pfn)
+{
+	return 0;
+}
+
 #endif

tools/include/linux/panic.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_LINUX_PANIC_H
+#define _TOOLS_LINUX_PANIC_H
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static inline void panic(const char *fmt, ...)
+{
+	va_list argp;
+
+	va_start(argp, fmt);
+	vfprintf(stderr, fmt, argp);
+	va_end(argp);
+	exit(-1);
+}
+
+#endif