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linux/arch/parisc/include/asm
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John David Anglin 38860b2c8b parisc: Flush kernel data mapping in set_pte_at() when installing pte for user page 
For years, there have been random segmentation faults in userspace on
SMP PA-RISC machines.  It occurred to me that this might be a problem in
set_pte_at().  MIPS and some other architectures do cache flushes when
installing PTEs with the present bit set.

Here I have adapted the code in update_mmu_cache() to flush the kernel
mapping when the kernel flush is deferred, or when the kernel mapping
may alias with the user mapping.  This simplifies calls to
update_mmu_cache().

I also changed the barrier in set_pte() from a compiler barrier to a
full memory barrier.  I know this change is not sufficient to fix the
problem.  It might not be needed.

I have had a few days of operation with 5.14.16 to 5.15.1 and haven't
seen any random segmentation faults on rp3440 or c8000 so far.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@kernel.org # 5.12+
2021-11-13 22:10:56 +01:00
..
agp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
alternative.h
parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU
2019-08-12 19:17:39 +02:00
asm-offsets.h
…
asmregs.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153
2019-05-30 11:26:32 -07:00
assembly.h
parisc: move virt_map macro to assembly.h
2021-11-01 07:35:59 +01:00
atomic.h
locking/atomic: parisc: move to ARCH_ATOMIC
2021-05-26 13:20:51 +02:00
barrier.h
parisc: Add alternative patching to synchronize_caches define
2020-10-15 08:10:38 +02:00
bitops.h
parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
2021-11-01 07:36:00 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cache.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
cacheflush.h
mm: Add flush_dcache_folio()
2021-10-18 07:49:36 -04:00
checksum.h
saner calling conventions for csum_and_copy_..._user()
2020-08-20 15:45:15 -04:00
cmpxchg.h
locking/atomic: parisc: move to ARCH_ATOMIC
2021-05-26 13:20:51 +02:00
compat_ucontext.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat.h
arch: remove compat_alloc_user_space
2021-09-08 15:32:35 -07:00
current.h
parisc: Move thread_info into task struct
2021-11-01 07:35:59 +01:00
delay.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dma-mapping.h
parisc: move internal implementation details out of <asm/dma-mapping.h>
2019-02-21 20:37:11 +01:00
dma.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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
eisa_bus.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
eisa_eeprom.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
elf.h
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-09 13:33:54 -07:00
fb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fixmap.h
parisc: add kexec syscall support
2019-09-08 15:37:04 +02:00
floppy.h
floppy: use symbolic register names in the parisc port
2020-05-12 19:34:53 +03:00
ftrace.h
parisc/ftrace: Add ARCH_SUPPORTS_FTRACE_OPS support
2019-08-03 08:56:57 +02:00
futex.h
parisc: Don't disable interrupts in cmpxchg and futex operations
2021-11-04 11:21:20 +01:00
grfioctl.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
hardirq.h
softirq: Move __ARCH_HAS_DO_SOFTIRQ to Kconfig
2021-02-10 23:34:16 +01:00
hardware.h
parisc: Use per-pagetable spinlock
2019-05-03 23:47:41 +02:00
hash.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/hugetlb: define a generic fallback for arch_clear_hugepage_flags()
2020-06-03 20:09:46 -07:00
ide.h
parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
2021-11-01 07:36:00 +01:00
io.h
mm: remove xlate_dev_kmem_ptr()
2021-05-07 00:26:34 -07:00
irq.h
parisc: Remove leftover reference to the power_tasklet
2021-01-26 19:57:26 +01:00
irqflags.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
jump_label.h
parisc: Add static branch and JUMP_LABEL feature
2019-05-06 00:10:03 +02:00
kbdleds.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kbuild
parisc: syscalls: switch to generic syscalltbl.sh
2021-04-27 09:43:56 +02:00
kexec.h
parisc: fix compilation when KEXEC=n and KEXEC_FILE=y
2019-12-15 21:05:38 +01:00
kfence.h
parisc: Add KFENCE support
2021-10-30 23:11:00 +02:00
kgdb.h
parisc: add KGDB support
2019-05-03 23:47:38 +02:00
kprobes.h
parisc: add kprobe_fault_handler()
2019-07-21 11:01:55 +02:00
ldcw.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
led.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
linkage.h
parisc: Fix boot failure of 64-bit kernel
2018-08-21 14:32:44 +02:00
machdep.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mckinley.h
parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
2021-11-01 07:36:00 +01:00
mmu_context.h
parisc: Optimize per-pagetable spinlocks
2021-02-12 16:39:42 +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
parisc: Switch from DISCONTIGMEM to SPARSEMEM
2019-05-03 23:47:40 +02:00
module.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
page.h
parisc: Use absolute_pointer() to define PAGE0
2021-09-16 08:35:42 +02:00
parisc-device.h
parisc: Make struct parisc_driver::remove() return void
2021-08-30 10:18:25 +02:00
parport.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
patch.h
parisc: add support for patching multiple words
2019-06-08 12:56:25 +02:00
pci.h
parisc: remove the HBA_DATA macro
2019-02-21 20:37:12 +01:00
pdc_chassis.h
treewide: remove editor modelines and cruft
2021-05-07 00:26:34 -07:00
pdc.h
parisc/firmware: add functions to retrieve TOC data
2021-11-01 07:35:59 +01:00
pdcpat.h
parisc: Add constant for PDC_PAT_COMPLEX firmware call
2019-02-21 20:37:13 +01:00
perf_event.h
…
perf.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
parisc: Rename PMD_ORDER to PMD_TABLE_ORDER
2021-08-30 10:18:25 +02:00
pgtable.h
parisc: Flush kernel data mapping in set_pte_at() when installing pte for user page
2021-11-13 22:10:56 +01:00
prefetch.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
processor.h
Merge tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
2021-11-01 16:51:13 -07:00
psw.h
parisc: asm: psw.h: missing header guard
2019-06-25 14:52:26 +02:00
ptrace.h
parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.h
2021-11-01 07:36:00 +01:00
ropes.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rt_sigframe.h
parisc: Reduce sigreturn trampoline to 3 instructions
2021-09-09 12:44:31 +02:00
runway.h
parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
2021-11-01 07:36:00 +01:00
seccomp.h
parisc: Enable seccomp architecture tracking
2020-11-20 11:16:34 -08:00
sections.h
parisc: Add alternative coding infrastructure
2018-10-17 17:22:26 +02:00
serial.h
parisc: remove empty SERIAL_PORT_DFNS in serial.h
2013-11-30 21:02:18 +01:00
shmparam.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
signal.h
signal/parisc: Remove parisc specific definition of __ARCH_UAPI_SA_FLAGS
2020-11-30 13:43:35 -06:00
smp.h
parisc: move CPU field back into thread_info
2021-11-04 11:21:47 +01:00
socket.h
parisc: Define O_NONBLOCK to become 000200000
2020-10-15 08:10:38 +02:00
sparsemem.h
parisc: Switch from DISCONTIGMEM to SPARSEMEM
2019-05-03 23:47:40 +02:00
special_insns.h
parisc: Use lpa instruction to load physical addresses in driver code
2019-06-06 14:12:22 +02:00
spinlock_types.h
parisc: Rework arch_rw locking functions
2020-04-05 22:29:55 +02:00
spinlock.h
locking: Remove spin_lock_flags() etc
2021-10-30 16:37:28 +02:00
string.h
Revert "parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat"
2021-08-29 10:13:32 -07:00
superio.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
syscall.h
parisc: define syscall_get_error()
2019-07-16 19:23:24 -07:00
termios.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
thread_info.h
parisc: move CPU field back into thread_info
2021-11-04 11:21:47 +01:00
timex.h
locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header
2020-08-06 16:13:13 +02:00
tlb.h
parisc: use pgtable-nopXd instead of 4level-fixup
2019-12-04 19:44:15 -08:00
tlbflush.h
parisc: Use per-pagetable spinlock
2019-05-03 23:47:41 +02:00
topology.h
parisc: Add CPU topology support
2017-11-17 15:27:22 +01:00
traps.h
parisc: make parisc_acctyp() available outside of faults.c
2021-10-30 23:11:00 +02:00
uaccess.h
parisc: Implement __get/put_kernel_nofault()
2021-09-09 22:53:09 +02:00
ucontext.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
unaligned.h
parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
2021-11-01 07:36:00 +01:00
unistd.h
parisc: Wire up clone3 syscall
2019-07-17 23:11:28 +02:00
unwind.h
parisc: Consolidate unwind initialization calls
2018-08-17 17:00:08 +02:00
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