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mm: memblock: make keeping memblock memory opt-in rather than opt-out 

Most architectures do not need the memblock memory after the page
allocator is initialized, but only few enable ARCH_DISCARD_MEMBLOCK in the
arch Kconfig.

Replacing ARCH_DISCARD_MEMBLOCK with ARCH_KEEP_MEMBLOCK and inverting the
logic makes it clear which architectures actually use memblock after
system initialization and skips the necessity to add ARCH_DISCARD_MEMBLOCK
to the architectures that are still missing that option.

Link: http://lkml.kernel.org/r/1556102150-32517-1-git-send-email-rppt@linux.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2019-05-13 17:22:59 -07:00 committed by Linus Torvalds
parent f27a5136f7
commit 350e88bad4
16 changed files with 19 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/Kconfig
View File

@ -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

1
arch/arm64/Kconfig
View File

@ -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

1
arch/hexagon/Kconfig
View File

@ -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

1
arch/ia64/Kconfig
View File

@ -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

1
arch/m68k/Kconfig
View File

@ -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

1
arch/mips/Kconfig
View File

@ -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

1
arch/nios2/Kconfig
View File

@ -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

1
arch/powerpc/Kconfig
View File

@ -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

1
arch/s390/Kconfig
View File

@ -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

1
arch/sh/Kconfig
View File

@ -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

1
arch/x86/Kconfig
View File

@ -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

3
include/linux/memblock.h
View File

@ -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, ...) \

16
kernel/kexec_file.c
View File

@ -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);

2
mm/Kconfig
View File

@ -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

6
mm/memblock.c
View File

@ -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)
{

3
mm/page_alloc.c
View File

@ -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);