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Filename Latest commit message Latest commit date
Nicholas Piggin 107290a8f0 Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled" 
[ Upstream commit abc3fce76adbdfa8f87272c784b388cd20b46049 ]

This reverts commit ebb37cf3ff.

That commit does not play well with soft-masked irq state
manipulations in idle, interrupt replay, and possibly others due to
tracing code sometimes using irq_work_queue (e.g., in
trace_hardirqs_on()). That can cause PACA_IRQ_DEC to become set when
it is not expected, and be ignored or cleared or cause warnings.

The net result seems to be missing an irq_work until the next timer
interrupt in the worst case which is usually not going to be noticed,
however it could be a long time if the tick is disabled, which is
against the spirit of irq_work and might cause real problems.

The idea is still solid, but it would need more work. It's not really
clear if it would be worth added complexity, so revert this for
now (not a straight revert, but replace with a comment explaining why
we might see interrupts happening, and gives git blame something to
find).

Fixes: ebb37cf3ff ("powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200402120401.1115883-1-npiggin@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-04-29 16:33:01 +02:00
arch Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled" 2020-04-29 16:33:01 +02:00
block block, bfq: invoke flush_idle_tree after reparent_active_queues in pd_offline 2020-04-23 10:36:26 +02:00
certs
crypto crypto: rng - Fix a refcounting bug in crypto_rng_reset() 2020-04-17 10:50:16 +02:00
Documentation arm64: errata: Hide CTR_EL0.DIC on systems affected by Neoverse-N1 #1542419 2020-04-29 16:32:56 +02:00
drivers loop: Better discard support for block devices 2020-04-29 16:33:01 +02:00
fs ceph: don't skip updating wanted caps when cap is stale 2020-04-29 16:32:58 +02:00
include KEYS: Don't write out to userspace while holding key semaphore 2020-04-23 10:36:45 +02:00
init kbuild: remove header compile test 2020-03-05 16:43:47 +01:00
ipc ipc/util.c: sysvipc_find_ipc() should increase position index 2020-04-29 16:33:00 +02:00
kernel kernel/gcov/fs.c: gcov_seq_next() should increase position index 2020-04-29 16:33:00 +02:00
lib lib/raid6/test: fix build on distros whose /bin/sh is not bash 2020-04-29 16:33:00 +02:00
LICENSES
mm mm, memcg: do not high throttle allocators based on wraparound 2020-04-17 10:50:17 +02:00
net net, ip_tunnel: fix interface lookup with no key 2020-04-29 16:32:55 +02:00
samples
scripts kconfig: qconf: Fix a few alignment issues 2020-04-29 16:33:00 +02:00
security KEYS: Don't write out to userspace while holding key semaphore 2020-04-23 10:36:45 +02:00
sound ASoC: Intel: atom: Take the drv->lock mutex before calling sst_send_slot_map() 2020-04-29 16:32:59 +02:00
tools selftests: kmod: fix handling test numbers above 9 2020-04-29 16:33:00 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: Check for a bad hva before dropping into the ghc slow path 2020-03-05 16:43:48 +01:00
.clang-format
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Makefile Linux 5.4.35 2020-04-23 10:36:46 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.