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Filename Latest commit message Latest commit date
Nicholas Piggin 6cc3f91bf6 powerpc/64s: Fix may_hard_irq_enable() for PMI soft masking
The soft IRQ masking code has to hard-disable interrupts in cases
where the exception is not cleared by the masked handler. External
interrupts used this approach for soft masking. Now recently PMU
interrupts do the same thing.

The soft IRQ masking code additionally allowed for interrupt handlers
to hard-enable interrupts after soft-disabling them. The idea is to
allow PMU interrupts through to profile interrupt handlers.

So when interrupts are being replayed when there is a pending
interrupt that requires hard-disabling, there is a test to prevent
those handlers from hard-enabling them if there is a pending external
interrupt. may_hard_irq_enable() handles this.

After f442d00480 ("powerpc/64s: Add support to mask perf interrupts
and replay them"), may_hard_irq_enable() could prematurely enable
MSR[EE] when a PMU exception exists, which would result in the
interrupt firing again while masked, and MSR[EE] being disabled again.

I haven't seen that this could cause a serious problem, but it's
more consistent to handle these soft-masked interrupts in the same
way. So introduce a define for all types of interrupts that require
MSR[EE] masking in their soft-disable handlers, and use that in
may_hard_irq_enable().

Fixes: f442d00480 ("powerpc/64s: Add support to mask perf interrupts and replay them")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-08 23:56:10 +11:00
arch powerpc/64s: Fix may_hard_irq_enable() for PMI soft masking 2018-02-08 23:56:10 +11:00
block for-linus-20180204 2018-02-04 11:16:35 -08:00
certs
crypto
Documentation linux-watchdog 4.16-rc1 merge window tag 2018-02-07 11:54:34 -08:00
drivers regulator: Fix suspend to idle 2018-02-07 13:17:07 -08:00
firmware
fs iversion.h related cleanup for v4.16 2018-02-07 14:25:22 -08:00
include iversion.h related cleanup for v4.16 2018-02-07 14:25:22 -08:00
init membarrier: Provide core serializing command, *_SYNC_CORE 2018-02-05 21:35:03 +01:00
ipc ipc/mqueue.c: have RT tasks queue in by priority in wq_add() 2018-02-06 18:32:46 -08:00
kernel Modules updates for v4.16 2018-02-07 14:29:34 -08:00
lib Merge branch 'akpm' (patches from Andrew) 2018-02-06 22:15:42 -08:00
LICENSES
mm Merge branch 'akpm' (patches from Andrew) 2018-02-06 22:15:42 -08:00
net seq_file: Introduce DEFINE_SHOW_ATTRIBUTE() helper macro 2018-02-07 12:50:21 +02:00
samples sample/bpf: fix erspan metadata 2018-02-06 11:32:49 -05:00
scripts Modules updates for v4.16 2018-02-07 14:29:34 -08:00
security iversion.h related cleanup for v4.16 2018-02-07 14:25:22 -08:00
sound ASoC: Updates for v4.16 2018-02-07 12:11:09 -08:00
tools Merge branch 'akpm' (patches from Andrew) 2018-02-06 22:15:42 -08:00
usr
virt Currently, hardened usercopy performs dynamic bounds checking on slab 2018-02-03 16:25:42 -08:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Modules updates for v4.16 2018-02-07 14:29:34 -08:00
Makefile Makefile: introduce CONFIG_CC_STACKPROTECTOR_AUTO 2018-02-06 18:32:44 -08:00
README

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.