Merge tag 'memblock-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

Pull memblock updates from Mike Rapoport:

 - new memblock_estimated_nr_free_pages() helper to replace
   totalram_pages() which is less accurate when
   CONFIG_DEFERRED_STRUCT_PAGE_INIT is set

 - fixes for memblock tests

* tag 'memblock-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  s390/mm: get estimated free pages by memblock api
  kernel/fork.c: get estimated free pages by memblock api
  mm/memblock: introduce a new helper memblock_estimated_nr_free_pages()
  memblock test: fix implicit declaration of function 'strscpy'
  memblock test: fix implicit declaration of function 'isspace'
  memblock test: fix implicit declaration of function 'memparse'
  memblock test: add the definition of __setup()
  memblock test: fix implicit declaration of function 'virt_to_phys'
  tools/testing: abstract two init.h into common include directory
  memblock tests: include export.h in linkage.h as kernel dose
  memblock tests: include memory_hotplug.h in mmzone.h as kernel dose

Author: torvalds

arch/s390/mm/init.c

@@ -62,7 +62,7 @@ EXPORT_SYMBOL(zero_page_mask);
 
 static void __init setup_zero_pages(void)
 {
-	unsigned long total_pages = PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size());
+	unsigned long total_pages = memblock_estimated_nr_free_pages();
 	unsigned int order;
 	struct page *page;
 	int i;

include/linux/memblock.h

@@ -467,6 +467,7 @@ static inline __init_memblock bool memblock_bottom_up(void)
 
 phys_addr_t memblock_phys_mem_size(void);
 phys_addr_t memblock_reserved_size(void);
+unsigned long memblock_estimated_nr_free_pages(void);
 phys_addr_t memblock_start_of_DRAM(void);
 phys_addr_t memblock_end_of_DRAM(void);
 void memblock_enforce_memory_limit(phys_addr_t memory_limit);

kernel/fork.c

@@ -999,7 +999,7 @@ void __init __weak arch_task_cache_init(void) { }
 static void __init set_max_threads(unsigned int max_threads_suggested)
 {
 	u64 threads;
-	unsigned long nr_pages = PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size());
+	unsigned long nr_pages = memblock_estimated_nr_free_pages();
 
 	/*
 	 * The number of threads shall be limited such that the thread

mm/memblock.c

@@ -1731,6 +1731,23 @@ phys_addr_t __init_memblock memblock_reserved_size(void)
 	return memblock.reserved.total_size;
 }
 
+/**
+ * memblock_estimated_nr_free_pages - return estimated number of free pages
+ * from memblock point of view
+ *
+ * During bootup, subsystems might need a rough estimate of the number of free
+ * pages in the whole system, before precise numbers are available from the
+ * buddy. Especially with CONFIG_DEFERRED_STRUCT_PAGE_INIT, the numbers
+ * obtained from the buddy might be very imprecise during bootup.
+ *
+ * Return:
+ * An estimated number of free pages from memblock point of view.
+ */
+unsigned long __init memblock_estimated_nr_free_pages(void)
+{
+	return PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size());
+}
+
 /* lowest address */
 phys_addr_t __init_memblock memblock_start_of_DRAM(void)
 {

tools/include/linux/compiler.h

@@ -128,10 +128,6 @@
 # define unlikely(x)		__builtin_expect(!!(x), 0)
 #endif
 
-#ifndef __init
-# define __init
-#endif
-
 #include <linux/types.h>
 
 /*

tools/testing/memblock/linux/init.h renamed to tools/include/linux/init.h

@@ -1,10 +1,16 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_INIT_H
-#define _LINUX_INIT_H
+#ifndef _TOOLS_LINUX_INIT_H_
+#define _TOOLS_LINUX_INIT_H_
 
 #include <linux/compiler.h>
-#include <asm/export.h>
-#include <linux/memory_hotplug.h>
+
+#ifndef __init
+# define __init
+#endif
+
+#ifndef __exit
+# define __exit
+#endif
 
 #define __section(section)              __attribute__((__section__(section)))
 
@@ -28,7 +34,10 @@ struct obs_kernel_param {
 		__aligned(__alignof__(struct obs_kernel_param)) =	\
 		{ __setup_str_##unique_id, fn, early }
 
+#define __setup(str, fn)						\
+	__setup_param(str, fn, fn, 0)
+
 #define early_param(str, fn)						\
 	__setup_param(str, fn, fn, 1)
 
-#endif
+#endif /*  _TOOLS_LINUX_INIT_H_ */

tools/include/linux/linkage.h

@@ -1,6 +1,8 @@
 #ifndef _TOOLS_INCLUDE_LINUX_LINKAGE_H
 #define _TOOLS_INCLUDE_LINUX_LINKAGE_H
 
+#include <linux/export.h>
+
 #define SYM_FUNC_START(x) .globl x; x:
 
 #define SYM_FUNC_END(x)

tools/include/linux/mm.h

@@ -25,6 +25,12 @@ static inline void *phys_to_virt(unsigned long address)
 	return __va(address);
 }
 
+#define virt_to_phys virt_to_phys
+static inline phys_addr_t virt_to_phys(volatile void *address)
+{
+	return (phys_addr_t)address;
+}
+
 void reserve_bootmem_region(phys_addr_t start, phys_addr_t end, int nid);
 
 static inline void totalram_pages_inc(void)

tools/include/linux/pfn.h

@@ -7,4 +7,5 @@
 #define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
 #define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
 #define PFN_PHYS(x)	((phys_addr_t)(x) << PAGE_SHIFT)
+#define PHYS_PFN(x)	((unsigned long)((x) >> PAGE_SHIFT))
 #endif

tools/include/linux/string.h

@@ -12,6 +12,8 @@ void argv_free(char **argv);
 
 int strtobool(const char *s, bool *res);
 
+#define strscpy strcpy
+
 /*
  * glibc based builds needs the extern while uClibc doesn't.
  * However uClibc headers also define __GLIBC__ hence the hack below
@@ -49,4 +51,5 @@ extern char *strim(char *);
 extern void remove_spaces(char *s);
 
 extern void *memchr_inv(const void *start, int c, size_t bytes);
+extern unsigned long long memparse(const char *ptr, char **retptr);
 #endif /* _TOOLS_LINUX_STRING_H_ */