[PATCH 02/30] mm: remove CONFIG_NO_BOOTMEM

From: Mike Rapoport <hidden>
Date: 2018-09-14 12:11:24
Also in: linux-mips, linux-mm, linux-riscv, linux-s390, linux-um, linuxppc-dev
Subsystem: alpha port, arm port, arm64 port (aarch64 architecture), linux for powerpc (32-bit and 64-bit), m68k architecture, memblock and memory management initialization, memory management, memory management - core, memory management - mglru (multi-gen lru), microblaze architecture, mips, nios2 architecture, openrisc architecture, parisc architecture, qualcomm hexagon architecture, risc-v architecture, s390 architecture, sparc + ultrasparc (sparc/sparc64), superh, synopsys arc architecture, tensilica xtensa port (xtensa), the rest, user-mode linux (uml), x86 architecture (32-bit and 64-bit) · Maintainers: Richard Henderson, Matt Turner, Magnus Lindholm, Russell King, Catalin Marinas, Will Deacon, Madhavan Srinivasan, Michael Ellerman, Geert Uytterhoeven, Mike Rapoport, Andrew Morton, David Hildenbrand, Michal Simek, Thomas Bogendoerfer, Dinh Nguyen, Jonas Bonn, Stefan Kristiansson, Stafford Horne, "James E.J. Bottomley", Helge Deller, Brian Cain, Paul Walmsley, Palmer Dabbelt, Albert Ou, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, "David S. Miller", Andreas Larsson, Yoshinori Sato, Rich Felker, John Paul Adrian Glaubitz, Vineet Gupta, Chris Zankel, Max Filippov, Linus Torvalds, Richard Weinberger, Anton Ivanov, Johannes Berg, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen

All achitectures select NO_BOOTMEM which essentially becomes 'Y' for any
kernel configuration and therefore it can be removed.

Signed-off-by: Mike Rapoport <redacted>
---
 arch/alpha/Kconfig      |  1 -
 arch/arc/Kconfig        |  1 -
 arch/arm/Kconfig        |  1 -
 arch/arm64/Kconfig      |  1 -
 arch/c6x/Kconfig        |  1 -
 arch/h8300/Kconfig      |  1 -
 arch/hexagon/Kconfig    |  1 -
 arch/ia64/Kconfig       |  1 -
 arch/m68k/Kconfig       |  1 -
 arch/microblaze/Kconfig |  1 -
 arch/mips/Kconfig       |  1 -
 arch/nds32/Kconfig      |  1 -
 arch/nios2/Kconfig      |  1 -
 arch/openrisc/Kconfig   |  1 -
 arch/parisc/Kconfig     |  1 -
 arch/powerpc/Kconfig    |  1 -
 arch/riscv/Kconfig      |  1 -
 arch/s390/Kconfig       |  1 -
 arch/sh/Kconfig         |  1 -
 arch/sparc/Kconfig      |  1 -
 arch/um/Kconfig         |  1 -
 arch/unicore32/Kconfig  |  1 -
 arch/x86/Kconfig        |  3 ---
 arch/xtensa/Kconfig     |  1 -
 include/linux/bootmem.h | 36 ++----------------------------------
 include/linux/mmzone.h  |  5 +----
 mm/Kconfig              |  3 ---
 mm/Makefile             |  7 +------
 mm/memblock.c           |  2 --
 29 files changed, 4 insertions(+), 75 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 620b0a7..04de6be 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig

@@ -32,7 +32,6 @@ config ALPHA
 	select OLD_SIGSUSPEND
 	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	help
 	  The Alpha is a 64-bit general-purpose processor designed and
 	  marketed by the Digital Equipment Corporation of blessed memory,

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index b4441b0..04ebead 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig

@@ -44,7 +44,6 @@ config ARC
 	select HANDLE_DOMAIN_IRQ
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4607d32..a961d70 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -100,7 +100,6 @@ config ARM
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_REL
 	select NEED_DMA_MAP_STATE
-	select NO_BOOTMEM
 	select OF_EARLY_FLATTREE if OF
 	select OF_RESERVED_MEM if OF
 	select OLD_SIGACTION

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0128d84..1795eaa 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig

@@ -156,7 +156,6 @@ config ARM64
 	select MULTI_IRQ_HANDLER
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM

diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index 85ed568..a641b0b 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig

@@ -14,7 +14,6 @@ config C6X
 	select GENERIC_IRQ_SHOW
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select SPARSE_IRQ
 	select IRQ_DOMAIN
 	select OF

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 0b334b6..5e89d40 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig

@@ -16,7 +16,6 @@ config H8300
 	select OF_IRQ
 	select OF_EARLY_FLATTREE
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select TIMER_OF
 	select H8300_TMR8
 	select HAVE_KERNEL_GZIP

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 3ba6873..24a6da9 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig

@@ -33,7 +33,6 @@ config HEXAGON
 	select GENERIC_CPU_DEVICES
 	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
-	select NO_BOOTMEM
 	---help---
 	  Qualcomm Hexagon is a processor architecture designed for high
 	  performance and low power across a wide variety of applications.

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 8b4a0c17..2bf4ef7 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig

@@ -28,7 +28,6 @@ config IA64
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
-	select NO_BOOTMEM
 	select HAVE_VIRT_CPU_ACCOUNTING
 	select ARCH_HAS_DMA_MARK_CLEAN
 	select ARCH_HAS_SG_CHAIN

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 0705537..8c7111d 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig

@@ -29,7 +29,6 @@ config M68K
 	select DMA_NONCOHERENT_OPS if HAS_DMA
 	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
-	select NO_BOOTMEM
 
 config CPU_BIG_ENDIAN
 	def_bool y

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index ace5c5b..56379b9 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig

@@ -28,7 +28,6 @@ config MICROBLAZE
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
-	select NO_BOOTMEM
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_OPROFILE

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1b5fa1a..54532f2 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig

@@ -78,7 +78,6 @@ config MIPS
 	select RTC_LIB
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS
-	select NO_BOOTMEM
 
 menu "Machine selection"

diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index 7068f34..06b1259 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig

@@ -36,7 +36,6 @@ config NDS32
 	select MODULES_USE_ELF_RELA
 	select OF
 	select OF_EARLY_FLATTREE
-	select NO_BOOTMEM
 	select NO_IOPORT_MAP
 	select RTC_LIB
 	select THREAD_INFO_IN_TASK

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 5ddf272..ebfae50 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig

@@ -25,7 +25,6 @@ config NIOS2
 	select CPU_NO_EFFICIENT_FFS
 	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
-	select NO_BOOTMEM
 
 config GENERIC_CSUM
 	def_bool y

diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index e0081e7..25c6c2e 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig

@@ -32,7 +32,6 @@ config OPENRISC
 	select HAVE_DEBUG_STACKOVERFLOW
 	select OR1K_PIC
 	select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
-	select NO_BOOTMEM
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select ARCH_USE_QUEUED_RWLOCKS
 	select OMPIC if SMP

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 8e6d83f..1d6332c 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig

@@ -16,7 +16,6 @@ config PARISC
 	select RTC_DRV_GENERIC
 	select INIT_ALL_POSSIBLE
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select BUG
 	select BUILDTIME_EXTABLE_SORT
 	select HAVE_PERF_EVENTS

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a806692..304cdce 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig

@@ -228,7 +228,6 @@ config PPC
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE		if PPC64 || NOT_COHERENT_CACHE
 	select NEED_SG_DMA_LENGTH
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a344980..63301c8 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig

@@ -34,7 +34,6 @@ config RISCV
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_PERF_EVENTS
 	select IRQ_DOMAIN
-	select NO_BOOTMEM
 	select RISCV_ISA_A if SMP
 	select SPARSE_IRQ
 	select SYSCTL_EXCEPTION_TRACE

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 9a9c7a6..b388e05 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig

@@ -166,7 +166,6 @@ config S390
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_VIRT_CPU_ACCOUNTING
 	select MODULES_USE_ELF_RELA
-	select NO_BOOTMEM
 	select OLD_SIGACTION
 	select OLD_SIGSUSPEND3
 	select SPARSE_IRQ

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 1fb7b6d..e254226 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig

@@ -10,7 +10,6 @@ config SUPERH
 	select HAVE_IDE if HAS_IOPORT_MAP
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
-	select NO_BOOTMEM
 	select ARCH_DISCARD_MEMBLOCK
 	select HAVE_OPROFILE
 	select HAVE_GENERIC_DMA_COHERENT

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index e6f2a38..5e8aaee 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig

@@ -46,7 +46,6 @@ config SPARC
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 
 config SPARC32
 	def_bool !64BIT

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 10c15b8..ce3d562 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig

@@ -13,7 +13,6 @@ config UML
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select GENERIC_IRQ_SHOW
 	select GENERIC_CPU_DEVICES
 	select GENERIC_CLOCKEVENTS

diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 6f38f7f..60eae74 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig

@@ -5,7 +5,6 @@ config UNICORE32
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e420b2a..859bf9a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig

@@ -835,9 +835,6 @@ config JAILHOUSE_GUEST
 
 endif #HYPERVISOR_GUEST
 
-config NO_BOOTMEM
-	def_bool y
-
 source "arch/x86/Kconfig.cpu"
 
 config HPET_TIMER

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 04d038f..e4f7d12 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig

@@ -33,7 +33,6 @@ config XTENSA
 	select HAVE_STACKPROTECTOR
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
-	select NO_BOOTMEM
 	select PERF_USE_VMALLOC
 	select VIRT_TO_BUS
 	help

diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 4251519..1f005b5 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h

@@ -26,34 +26,6 @@ extern unsigned long max_pfn;
  */
 extern unsigned long long max_possible_pfn;
 
-#ifndef CONFIG_NO_BOOTMEM
-/**
- * struct bootmem_data - per-node information used by the bootmem allocator
- * @node_min_pfn: the starting physical address of the node's memory
- * @node_low_pfn: the end physical address of the directly addressable memory
- * @node_bootmem_map: is a bitmap pointer - the bits represent all physical
- *		      memory pages (including holes) on the node.
- * @last_end_off: the offset within the page of the end of the last allocation;
- *                if 0, the page used is full
- * @hint_idx: the PFN of the page used with the last allocation;
- *            together with using this with the @last_end_offset field,
- *            a test can be made to see if allocations can be merged
- *            with the page used for the last allocation rather than
- *            using up a full new page.
- * @list: list entry in the linked list ordered by the memory addresses
- */
-typedef struct bootmem_data {
-	unsigned long node_min_pfn;
-	unsigned long node_low_pfn;
-	void *node_bootmem_map;
-	unsigned long last_end_off;
-	unsigned long hint_idx;
-	struct list_head list;
-} bootmem_data_t;
-
-extern bootmem_data_t bootmem_node_data[];
-#endif
-
 extern unsigned long bootmem_bootmap_pages(unsigned long);
 
 extern unsigned long init_bootmem_node(pg_data_t *pgdat,

@@ -125,12 +97,8 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 				      unsigned long align,
 				      unsigned long goal) __malloc;
 
-#ifdef CONFIG_NO_BOOTMEM
 /* We are using top down, so it is safe to use 0 here */
 #define BOOTMEM_LOW_LIMIT 0
-#else
-#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
-#endif
 
 #ifndef ARCH_LOW_ADDRESS_LIMIT
 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL

@@ -165,7 +133,7 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 	__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 
 
-#if defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)
+#if defined(CONFIG_HAVE_MEMBLOCK)
 
 /* FIXME: use MEMBLOCK_ALLOC_* variants here */
 #define BOOTMEM_ALLOC_ACCESSIBLE	0

@@ -373,7 +341,7 @@ static inline void __init memblock_free_late(
 {
 	free_bootmem_late(base, size);
 }
-#endif /* defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM) */
+#endif /* defined(CONFIG_HAVE_MEMBLOCK) */
 
 extern void *alloc_large_system_hash(const char *tablename,
 				     unsigned long bucketsize,

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d267bce..4179e67 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h

@@ -632,9 +632,6 @@ typedef struct pglist_data {
 	struct page_ext *node_page_ext;
 #endif
 #endif
-#ifndef CONFIG_NO_BOOTMEM
-	struct bootmem_data *bdata;
-#endif
 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
 	/*
 	 * Must be held any time you expect node_start_pfn, node_present_pages

@@ -878,7 +875,7 @@ static inline int is_highmem_idx(enum zone_type idx)
 }
 
 /**
- * is_highmem - helper function to quickly check if a struct zone is a 
+ * is_highmem - helper function to quickly check if a struct zone is a
  *              highmem zone or not.  This is an attempt to keep references
  *              to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum.
  * @zone - pointer to struct zone variable

diff --git a/mm/Kconfig b/mm/Kconfig
index 7bf074b..16ceea0 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig

@@ -145,9 +145,6 @@ config HAVE_GENERIC_GUP
 config ARCH_DISCARD_MEMBLOCK
 	bool
 
-config NO_BOOTMEM
-	bool
-
 config MEMORY_ISOLATION
 	bool

diff --git a/mm/Makefile b/mm/Makefile
index 6485d57..ea53338 100644
--- a/mm/Makefile
+++ b/mm/Makefile

@@ -42,12 +42,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
 			   debug.o $(mmu-y)
 
 obj-y += init-mm.o
-
-ifdef CONFIG_NO_BOOTMEM
-	obj-y		+= nobootmem.o
-else
-	obj-y		+= bootmem.o
-endif
+obj-y += nobootmem.o
 
 ifdef CONFIG_MMU
 	obj-$(CONFIG_ADVISE_SYSCALLS)	+= madvise.o

diff --git a/mm/memblock.c b/mm/memblock.c
index f798109..bba8d4e 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c

@@ -1369,7 +1369,6 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
 	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
 }
 
-#if defined(CONFIG_NO_BOOTMEM)
 /**
  * memblock_virt_alloc_internal - allocate boot memory block
  * @size: size of memory block to be allocated in bytes

@@ -1576,7 +1575,6 @@ void * __init memblock_virt_alloc_try_nid(
 	      __func__, (u64)size, (u64)align, nid, &min_addr, &max_addr);
 	return NULL;
 }
-#endif
 
 /**
  * __memblock_free_early - free boot memory block

-- 
2.7.4

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