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Baolin Wang ae07562909 mm: change huge_ptep_clear_flush() to return the original pte 
Patch series "Fix CONT-PTE/PMD size hugetlb issue when unmapping or migrating", v4.

presently, migrating a hugetlb page or unmapping a poisoned hugetlb page,
we'll use ptep_clear_flush() and set_pte_at() to nuke the page table entry
and remap it, and this is incorrect for CONT-PTE or CONT-PMD size hugetlb
page, which will cause potential data consistent issue.  This patch set
will change to use hugetlb related APIs to fix this issue.

Note: Mike pointed out the huge_ptep_get() will only return the one
specific value, and it would not take into account the dirty or young bits
of CONT-PTE/PMDs like the huge_ptep_get_and_clear() [1].  This
inconsistent issue is not introduced by this patch set, and this issue
will be addressed in another thread [2].  Meanwhile the uffd for hugetlb
case [3] pointed out by Gerald also needs another patch to address.

[1] https://lore.kernel.org/linux-mm/85bd80b4-b4fd-0d3f-a2e5-149559f2f387@oracle.com/
[2] https://lore.kernel.org/all/cover.1651998586.git.baolin.wang@linux.alibaba.com/
[3] https://lore.kernel.org/linux-mm/20220503120343.6264e126@thinkpad/


This patch (of 3):

It is incorrect to use ptep_clear_flush() to nuke a hugetlb page table
when unmapping or migrating a hugetlb page, and will change to use
huge_ptep_clear_flush() instead in the following patches.

So this is a preparation patch, which changes the huge_ptep_clear_flush()
to return the original pte to help to nuke a hugetlb page table.

[baolin.wang@linux.alibaba.com: fix build in several more architectures]
  Link: https://lkml.kernel.org/r/0009a4cd-2826-e8be-e671-f050d4f18d5d@linux.alibaba.com
[sfr@canb.auug.org.au: fixup]
  Link: https://lkml.kernel.org/r/20220511181531.7f27a5c1@canb.auug.org.au
Link: https://lkml.kernel.org/r/cover.1652270205.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/20f77ddab90baa249bd24504c413189b82acde69.1652270205.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/cover.1652147571.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/dcf065868cce35bceaf138613ad27f17bb7c0c19.1652147571.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Yoshinori Sato <ysato@users.osdn.me>
Cc: Rich Felker <dalias@libc.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-05-13 16:48:55 -07:00
..
adc.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
addrspace.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
alignment.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
asm-offsets.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
atomic-grb.h
locking/atomic: sh: move to ARCH_ATOMIC
2021-05-26 13:20:52 +02:00
atomic-irq.h
locking/atomic: sh: move to ARCH_ATOMIC
2021-05-26 13:20:52 +02:00
atomic-llsc.h
locking/atomic: sh: move to ARCH_ATOMIC
2021-05-26 13:20:52 +02:00
atomic.h
locking/atomic: sh: move to ARCH_ATOMIC
2021-05-26 13:20:52 +02:00
barrier.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
bitops-cas.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bitops-grb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bitops-llsc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bitops-op32.h
sh: use __builtin_constant_p() directly instead of IS_IMMEDIATE()
2020-04-09 00:01:58 +09:00
bitops.h
include: move find.h from asm_generic to linux
2022-01-15 08:47:31 -08:00
bl_bit_32.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bl_bit.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
bug.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bugs.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
cache_insns_32.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cache_insns.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
cache.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
cacheflush.h
Add linux/cacheflush.h
2021-11-17 10:36:15 -05:00
checksum_32.h
sh: fix trivial misannotations
2021-09-17 13:59:56 -04:00
checksum.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
clock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg-cas.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg-grb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg-irq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg-llsc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg-xchg.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
cmpxchg.h
locking/atomic: sh: move to ARCH_ATOMIC
2021-05-26 13:20:52 +02:00
device.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
dma-register.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
dma.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
dmabrg.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dwarf.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
elf.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
entry-macros.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
extable.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
fb.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
fixmap.h
sh/highmem: Remove all traces of unused cruft
2020-11-06 23:14:54 +01:00
flat.h
binfmt_flat: remove the persistent argument from flat_get_addr_from_rp
2019-06-24 09:16:47 +10:00
fpu.h
kill unused dump_fpu() instances
2020-07-27 14:33:10 -04:00
freq.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
ftrace.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
futex-cas.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
futex-irq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
futex-llsc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
futex.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
gpio.h
sh: Drop ARCH_NR_GPIOS definition
2021-01-06 19:55:27 -05:00
hardirq.h
sh: irqstat: Use the generic irq_cpustat_t
2020-11-23 10:31:06 +01:00
hd64461.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
heartbeat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hugetlb.h
mm: change huge_ptep_clear_flush() to return the original pte
2022-05-13 16:48:55 -07:00
hw_breakpoint.h
perf/hw_breakpoint: Remove default hw_breakpoint_arch_parse()
2018-06-26 09:07:58 +02:00
hw_irq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
i2c-sh7760.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
io_generic.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
io_noioport.h
sh: Convert ins[bwl]/outs[bwl] macros to inline functions
2020-06-01 14:48:50 -04:00
io_trapped.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
io.h
mm: remove xlate_dev_kmem_ptr()
2021-05-07 00:26:34 -07:00
irq.h
sh: Cleanup about SPARSE_IRQ
2021-10-27 16:50:52 -04:00
irqflags.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kbuild
local64.h: make <asm/local64.h> mandatory
2020-12-29 15:36:49 -08:00
kdebug.h
Revert "sh: add loglvl to printk_address()"
2020-08-14 22:05:07 -04:00
kexec.h
sh: prefer _THIS_IP_ to current_text_addr
2018-08-17 16:20:27 -07:00
kgdb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kprobes.h
kprobes: treewide: Make it harder to refer kretprobe_trampoline directly
2021-09-30 21:24:06 -04:00
linkage.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
machvec.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
mmiowb.h
sh/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()
2019-04-08 12:00:21 +01:00
mmu_context_32.h
sh: use asm-generic/mmu_context.h for no-op implementations
2020-10-27 16:02:38 +01:00
mmu_context.h
sh: use asm-generic/mmu_context.h for no-op implementations
2020-10-27 16:02:38 +01:00
mmu.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mmzone.h
mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA
2021-06-29 10:53:55 -07:00
module.h
arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>
2020-04-23 10:50:26 +09:00
page.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
pci.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
perf_event.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pgalloc.h
mm/thp: define default pmd_pgtable()
2021-07-01 11:06:03 -07:00
pgtable_32.h
arch: Add pmd_pfn() where it is missing
2022-03-21 12:59:02 -04:00
pgtable-2level.h
sh: add support for folded p4d page tables
2020-06-04 19:06:21 -07:00
pgtable-3level.h
sh: pgtable-3level: Fix cast to pointer from integer of different size
2021-10-27 16:56:34 -04:00
pgtable.h
mm: define default value for FIRST_USER_ADDRESS
2021-07-01 11:06:02 -07:00
platform_early.h
sh: add the sh_ prefix to early platform symbols
2019-10-07 13:50:48 +02:00
posix_types.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
processor_32.h
sched: Add wrapper for get_wchan() to keep task blocked
2021-10-15 11:25:14 +02:00
processor.h
sh: remove CONFIG_SET_FS support
2022-02-25 09:36:06 +01:00
ptrace_32.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ptrace.h
sh: don't use asm-generic/ptrace.h
2019-07-01 17:51:40 +02:00
push-switch.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
romimage-macros.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rtc.h
sh: remove board_time_init() callback
2018-12-18 16:13:04 +01:00
seccomp.h
sh: Enable seccomp architecture tracking
2020-11-20 11:16:35 -08:00
sections.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
setup.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sfp-machine.h
sh: define __BIG_ENDIAN for math-emu
2021-10-27 16:51:24 -04:00
sh7760fb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sh_bios.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
shmparam.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
siu.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
smc37c93x.h
arch: sh: smc37c93x: fix spelling mistake
2020-08-14 22:05:05 -04:00
smp-ops.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
sparsemem.h
Merge tag 'sh-for-5.9' of git://git.libc.org/linux-sh
2020-08-15 18:50:32 -07:00
spi.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
spinlock_types.h
locking: Allow to include asm/spinlock_types.h from linux/spinlock_types_raw.h
2021-12-07 15:14:12 +01:00
spinlock-cas.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
spinlock-llsc.h
sh/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()
2019-04-08 12:00:21 +01:00
spinlock.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
sram.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stackprotector.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stacktrace.h
sh: stacktrace: Remove stacktrace_ops.stack()
2020-08-14 22:05:11 -04:00
string_32.h
Merge tag 'sh-for-5.9' of git://git.libc.org/linux-sh
2020-08-15 18:50:32 -07:00
string.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
suspend.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
switch_to_32.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
switch_to.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
syscall_32.h
arch: remove unused function syscall_set_arguments()
2021-09-14 16:06:20 +02:00
syscall.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
syscalls_32.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
syscalls.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
thread_info.h
Merge tag 'flexible-array-transformations-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux
2022-03-24 11:39:32 -07:00
timex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tlb.h
arch/sh/include/asm/tlb.h: remove duplicate include
2021-04-30 11:20:35 -07:00
tlbflush.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
topology.h
arch/sh/include/asm/topology.h: remove unused parent_node() macro
2017-11-17 16:10:04 -08:00
traps_32.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
traps.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
types.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
uaccess_32.h
sh: Implement __get_user_u64() required for 64-bit get_user()
2020-08-14 22:05:04 -04:00
uaccess.h
sh: remove CONFIG_SET_FS support
2022-02-25 09:36:06 +01:00
uncached.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
unistd.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
unwinder.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
user.h
asm/user.h: killed unused macros
2022-01-30 21:17:00 -05:00
vermagic.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
vga.h
sh: include: convert to SPDX identifiers
2018-12-28 12:11:45 -08:00
vmalloc.h
mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h>
2019-12-10 10:12:55 +01:00
vmlinux.lds.h
sh: remove sh5 support
2020-06-01 14:48:52 -04:00
watchdog.h
sh: remove __KERNEL__ ifdefs from non-UAPI headers
2020-08-14 22:05:14 -04:00
word-at-a-time.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00