Linus Torvalds
c17b0aadb7
asm-generic fixes for v4.17-rc1
...
I have one regression fix for a minor build problem after the architecture
removal series, plus a rework of the barriers in the readl/writel
functions, thanks to work by Sinan Kaya:
This started from a discussion on the linuxpcc and rdma mailing lists
[1]. To summarize, we decided that architectures are responsible to
serialize readl() and writel() accesses on a device MMIO space relative
to DMA performed by that device.
This series provides a pessimistic implementation of that behavior for
asm-generic/io.h, which is in turn used by a number of architectures
(h8300, microblaze, nios2, openrisc, s390, sparc, um, unicore32, and
xtensa). Some of those presumably need no extra barriers, or something
weaker than rmb()/wmb(), and they are advised to override the new default
for better performance.
For inb()/outb(), the same barriers are used, but architectures might
want to add another barrier to outb() here if that can guarantee
non-posted behavior (some architectures can, others cannot do that).
The readl_relaxed()/writel_relaxed() family of functions retains the
existing behavior with no extra barriers.
[1]: https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-March/170481.html
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Merge tag 'asm-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
Pull asm-generic fixes from Arnd Bergmann:
"I have one regression fix for a minor build problem after the
architecture removal series, plus a rework of the barriers in the
readl/writel functions, thanks to work by Sinan Kaya:
This started from a discussion on the linuxpcc and rdma mailing
lists[1]. To summarize, we decided that architectures are responsible
to serialize readl() and writel() accesses on a device MMIO space
relative to DMA performed by that device.
This series provides a pessimistic implementation of that behavior for
asm-generic/io.h, which is in turn used by a number of architectures
(h8300, microblaze, nios2, openrisc, s390, sparc, um, unicore32, and
xtensa). Some of those presumably need no extra barriers, or something
weaker than rmb()/wmb(), and they are advised to override the new
default for better performance.
For inb()/outb(), the same barriers are used, but architectures might
want to add another barrier to outb() here if that can guarantee
non-posted behavior (some architectures can, others cannot do that).
The readl_relaxed()/writel_relaxed() family of functions retains the
existing behavior with no extra barriers"
[1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-March/170481.html
* tag 'asm-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
io: change writeX_relaxed() to remove barriers
io: change readX_relaxed() to remove barriers
dts: remove cris & metag dts hard link file
io: change inX() to have their own IO barrier overrides
io: change outX() to have their own IO barrier overrides
io: define stronger ordering for the default writeX() implementation
io: define stronger ordering for the default readX() implementation
io: define several IO & PIO barrier types for the asm-generic version
2018-04-12 09:15:48 -07:00
..
bitops
locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit()
2018-02-13 14:55:53 +01:00
4level-fixup.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
5level-fixup.h
x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable
2018-02-14 13:11:14 +01:00
asm-offsets.h
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
asm-prototypes.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
atomic-instrumented.h
locking/atomic, asm-generic, x86: Add comments for atomic instrumentation
2018-03-12 12:15:35 +01:00
atomic-long.h
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
atomic.h
mn10300: Remove the architecture
2018-03-09 23:19:56 +01:00
atomic64.h
locking/atomic: Fix atomic_set_release() for 'funny' architectures
2017-08-10 12:28:54 +02:00
audit_change_attr.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
audit_dir_write.h
audit: Avoid build failures on systems without renameat
2018-01-30 19:07:54 -08:00
audit_read.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
audit_signal.h
audit_write.h
audit/stable-4.15 PR 20171113
2017-11-15 13:28:48 -08:00
barrier.h
mn10300: Remove the architecture
2018-03-09 23:19:56 +01:00
bitops.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bitsperlong.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bug.h
bug.h: work around GCC PR82365 in BUG()
2018-02-21 15:35:43 -08:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cacheflush.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
checksum.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg-local.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
current.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +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
device.h
div64.h
A relatively calm cycle for the docs tree again.
2017-11-13 08:25:06 -08:00
dma-contiguous.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
dma-direct: rename dma_noop to dma_direct
2018-01-15 09:35:06 +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
early_ioremap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
emergency-restart.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
error-injection.h
error-injection: Add injectable error types
2018-01-12 17:33:38 -08:00
exec.h
mn10300: Remove the architecture
2018-03-09 23:19:56 +01:00
export.h
modversions: treat symbol CRCs as 32 bit quantities
2017-02-03 08:28:25 -08:00
extable.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
asm-generic: Fix local variable shadow in __set_fixmap_offset
2016-02-16 15:10:44 +00:00
ftrace.h
asm-generic headers: add ftrace.h
2011-03-17 09:19:04 +08:00
futex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
getorder.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gpio.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hardirq.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hw_irq.h
ide_iops.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
int-ll64.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
asm-generic fixes for v4.17-rc1
2018-04-12 09:15:48 -07:00
ioctl.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iomap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq_regs.h
core: Replace __get_cpu_var with __this_cpu_read if not used for an address.
2010-12-17 15:07:19 +01:00
irq_work.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +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
kdebug.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kmap_types.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kvm_para.h
KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED
2018-03-06 18:40:44 +01:00
linkage.h
local.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
local64.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mcs_spinlock.h
locking/mcs: Allow architecture specific asm files to be used for contended case
2014-02-09 21:18:52 +01:00
memory_model.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mm-arch-hooks.h
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mm_hooks.h
arch, mm: Allow arch_dup_mmap() to fail
2017-12-22 20:13:01 +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
mmu_context.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
msi.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
param.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
parport.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci_iomap.h
mn10300: Remove the architecture
2018-03-09 23:19:56 +01:00
percpu.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pgtable-nop4d-hack.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pgtable-nop4d.h
x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable
2018-02-14 13:11:14 +01:00
pgtable-nopmd.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pgtable-nopud.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pgtable.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next
2018-04-03 14:08:58 -07:00
preempt.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
asm-generic/ptrace.h: start a common low level ptrace helper
2011-05-26 17:12:36 -07:00
qrwlock.h
locking/qrwlock: Prevent slowpath writers getting held up by fastpath
2017-10-25 10:57:25 +02:00
qrwlock_types.h
locking/qrwlock: include asm/byteorder.h as needed
2018-02-06 10:28:58 +01:00
qspinlock.h
locking/arch: Remove dummy arch_{read,spin,write}_lock_flags() implementations
2017-10-10 11:50:19 +02:00
qspinlock_types.h
locking/qspinlock: Move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h
2016-02-29 10:02:43 +01:00
resource.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rwsem.h
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
seccomp.h
seccomp: Get compat syscalls from asm-generic header
2016-05-13 14:02:00 +02:00
sections.h
sections: split dereference_function_descriptor()
2018-01-09 10:45:37 +01:00
segment.h
serial.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
set_memory.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
simd.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sizes.h
ARM: 7430/1: sizes.h: move from asm-generic to <linux/sizes.h>
2012-06-28 17:14:34 +01:00
spinlock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
statfs.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
string.h
switch_to.h
mn10300: Remove the architecture
2018-03-09 23:19:56 +01:00
syscall.h
syscall.h: fix doc text for syscall_get_arch()
2014-09-23 16:20:00 -04:00
syscalls.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
termios-base.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
termios.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem
2017-08-10 15:54:07 -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
include/asm-generic/topology.h: remove unused parent_node() macro
2017-11-17 16:10:05 -08:00
trace_clock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
uaccess.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
unistd.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-generic/user.h: Fix spelling in comment
2011-03-01 15:49:39 +01:00
vga.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vmlinux.lds.h
arm64 updates for 4.17
2018-04-04 16:01:43 -07:00
vtime.h
include/asm-generic/vtime.h: avoid zero-length file
2013-09-30 14:31:02 -07:00
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
xor.h
asm-generic: xor: mark static functions as __maybe_unused
2012-10-03 21:21:06 +02:00