diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a11dfcc2a1309098e2bde4ef15d890ce44adb30b..5fd344bd06b92c789b50134c5c78ff5c7216db13 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -4,7 +4,6 @@ config ARM
default y
select ARCH_32BIT_OFF_T
select ARCH_CLOCKSOURCE_DATA
- select ARCH_DISCARD_MEMBLOCK if !HAVE_ARCH_PFN_VALID && !KEXEC
select ARCH_HAS_DEBUG_VIRTUAL if MMU
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
@@ -22,6 +21,7 @@ config ARM
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAS_GCOV_PROFILE_ALL
+ select ARCH_KEEP_MEMBLOCK if HAVE_ARCH_PFN_VALID || KEXEC
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_NO_SG_CHAIN if !ARM_HAS_SG_CHAIN
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7a1aa53d188d339ff75cdade361a57223938514c..69a59a5d1143b3f67695a62f53f4e1d295f721f0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -60,6 +60,7 @@ config ARM64
select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPT
select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPT
select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPT
+ select ARCH_KEEP_MEMBLOCK
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 3e54a53208d58ad7c7587dcc88920a692c5d2634..b7d404bbaa0fe8a8592e556ade45e17df1172b4c 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -22,7 +22,6 @@ config HEXAGON
select GENERIC_IRQ_SHOW
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
- select ARCH_DISCARD_MEMBLOCK
select NEED_SG_DMA_LENGTH
select NO_IOPORT_MAP
select GENERIC_IOMAP
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 73a26f04644e3e27a17c1fc1ab4145f22f6d520c..7468d8e504672a711e34a09984f2601f0cad6b1b 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -33,7 +33,6 @@ config IA64
select ARCH_HAS_DMA_COHERENT_TO_PFN if SWIOTLB
select ARCH_HAS_SYNC_DMA_FOR_CPU if SWIOTLB
select VIRT_TO_BUS
- select ARCH_DISCARD_MEMBLOCK
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
select GENERIC_IRQ_SHOW
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index fe5cc2da6d108ac0dd74feb5c709a3000eeb2e7b..218e037ef901a68cc0b1caa73a84288ad9205ed6 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -26,7 +26,6 @@ config M68K
select MODULES_USE_ELF_RELA
select OLD_SIGSUSPEND3
select OLD_SIGACTION
- select ARCH_DISCARD_MEMBLOCK
select MMU_GATHER_NO_RANGE if MMU
config CPU_BIG_ENDIAN
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ff8cff9fcf545bba8d9026aced13af4a804da07a..677e5bfeff477ad2472b4380ed682ca2c1b96d1a 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -5,7 +5,6 @@ config MIPS
select ARCH_32BIT_OFF_T if !64BIT
select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT
select ARCH_CLOCKSOURCE_DATA
- select ARCH_DISCARD_MEMBLOCK
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UBSAN_SANITIZE_ALL
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index ea37394ff3eab2ad16cb5d7f1f08fe9626431080..26a9c760a98bbcc36d43f6599326addcfeace594 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -23,7 +23,6 @@ config NIOS2
select SPARSE_IRQ
select USB_ARCH_HAS_HCD if USB_SUPPORT
select CPU_NO_EFFICIENT_FFS
- select ARCH_DISCARD_MEMBLOCK
select MMU_GATHER_NO_RANGE if MMU
config GENERIC_CSUM
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d7996cfacecaee9c007c4c3fe65769906c977e14..8c1c636308c8e6544fc781a3f4cbda6310ba95d1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -137,6 +137,7 @@ config PPC
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
+ select ARCH_KEEP_MEMBLOCK
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index d0c046af65fa4d6816e9369e145d83992339d1f8..109243fdb6ec96d04349072329db3367e233e724 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -100,6 +100,7 @@ config S390
select ARCH_INLINE_WRITE_UNLOCK_BH
select ARCH_INLINE_WRITE_UNLOCK_IRQ
select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
+ select ARCH_KEEP_MEMBLOCK
select ARCH_SAVE_PAGE_KEYS if HIBERNATION
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_NUMA_BALANCING
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 2a77033e1e7cf0737001340cc1faf437e29a7e4e..b77f512bb1766ebb22711a7e676063c7134d2f7e 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -10,7 +10,6 @@ config SUPERH
select DMA_DECLARE_COHERENT
select HAVE_IDE if HAS_IOPORT_MAP
select HAVE_MEMBLOCK_NODE_MAP
- select ARCH_DISCARD_MEMBLOCK
select HAVE_OPROFILE
select HAVE_ARCH_TRACEHOOK
select HAVE_PERF_EVENTS
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f21bc56e5d7b55a50f53d6fc518119a01034c830..818b361094ed6fe67ea049bbe9831e165804ffac 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -47,7 +47,6 @@ config X86
select ARCH_32BIT_OFF_T if X86_32
select ARCH_CLOCKSOURCE_DATA
select ARCH_CLOCKSOURCE_INIT
- select ARCH_DISCARD_MEMBLOCK
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEVMEM_IS_ALLOWED
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 47e3c0612592aa957c7610d55d392296cde66fed..676d3900e1bd5f0a3001105c944bd5da0097bba0 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -96,13 +96,14 @@ struct memblock {
extern struct memblock memblock;
extern int memblock_debug;
-#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+#ifndef CONFIG_ARCH_KEEP_MEMBLOCK
#define __init_memblock __meminit
#define __initdata_memblock __meminitdata
void memblock_discard(void);
#else
#define __init_memblock
#define __initdata_memblock
+static inline void memblock_discard(void) {}
#endif
#define memblock_dbg(fmt, ...) \
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index f7fb8f6a688fd47b4af8833c067510571fbdcf2c..072b6ee55e3f19d16fac73a9cbe7457fd311a72c 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -500,13 +500,7 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
return locate_mem_hole_bottom_up(start, end, kbuf);
}
-#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
-static int kexec_walk_memblock(struct kexec_buf *kbuf,
- int (*func)(struct resource *, void *))
-{
- return 0;
-}
-#else
+#ifdef CONFIG_ARCH_KEEP_MEMBLOCK
static int kexec_walk_memblock(struct kexec_buf *kbuf,
int (*func)(struct resource *, void *))
{
@@ -550,6 +544,12 @@ static int kexec_walk_memblock(struct kexec_buf *kbuf,
return ret;
}
+#else
+static int kexec_walk_memblock(struct kexec_buf *kbuf,
+ int (*func)(struct resource *, void *))
+{
+ return 0;
+}
#endif
/**
@@ -589,7 +589,7 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
return 0;
- if (IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
+ if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
ret = kexec_walk_resources(kbuf, locate_mem_hole_callback);
else
ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
diff --git a/mm/Kconfig b/mm/Kconfig
index 71e697e693dfd6e234e529b991080f596a75672c..c5124c2cb0b2508fe5dee863cbc0eaa16152804b 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -136,7 +136,7 @@ config HAVE_MEMBLOCK_PHYS_MAP
config HAVE_GENERIC_GUP
bool
-config ARCH_DISCARD_MEMBLOCK
+config ARCH_KEEP_MEMBLOCK
bool
config MEMORY_ISOLATION
diff --git a/mm/memblock.c b/mm/memblock.c
index f315eca9f4a1e4345d341e3efc94f1f121561d32..6bbad46f4d2cb33b6bb0cd9514277da46d918738 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -94,7 +94,7 @@
* :c:func:`mem_init` function frees all the memory to the buddy page
* allocator.
*
- * If an architecure enables %CONFIG_ARCH_DISCARD_MEMBLOCK, the
+ * Unless an architecure enables %CONFIG_ARCH_KEEP_MEMBLOCK, the
* memblock data structures will be discarded after the system
* initialization compltes.
*/
@@ -375,7 +375,7 @@ static void __init_memblock memblock_remove_region(struct memblock_type *type, u
}
}
-#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+#ifndef CONFIG_ARCH_KEEP_MEMBLOCK
/**
* memblock_discard - discard memory and reserved arrays if they were allocated
*/
@@ -1987,7 +1987,7 @@ unsigned long __init memblock_free_all(void)
return pages;
}
-#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
+#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_ARCH_KEEP_MEMBLOCK)
static int memblock_debug_show(struct seq_file *m, void *private)
{
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cbda9aea0bf575a18c862ba21e9d9d474c08198c..f2f3fb4921d102686ca921f0aa35f56ceaad2a9d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1896,10 +1896,9 @@ void __init page_alloc_init_late(void)
/* Reinit limits that are based on free pages after the kernel is up */
files_maxfiles_init();
#endif
-#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+
/* Discard memblock private memory */
memblock_discard();
-#endif
for_each_populated_zone(zone)
set_zone_contiguous(zone);