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Filename Latest commit message Latest commit date
Sasha Levin cfd9d71377 Revert "coresight: Make sysfs functional on topologies with per core sink" 
This reverts commit 8fd52a21ab.

Guenter Roeck <linux@roeck-us.net> writes:

I get the following build warning in v5.4.75.

drivers/hwtracing/coresight/coresight-etm-perf.c: In function 'etm_setup_aux':
drivers/hwtracing/coresight/coresight-etm-perf.c:226:37: warning:
                        passing argument 1 of 'coresight_get_enabled_sink' makes pointer from integer without a cast

Actually, the warning is fatal, since the call is
        sink = coresight_get_enabled_sink(true);
However, the argument to coresight_get_enabled_sink() is now a pointer.
The parameter change was introduced with commit 8fd52a21ab
("coresight: Make sysfs functional on topologies with per core sink").

In the upstream kernel, the call is removed with commit bb1860efc817
("coresight: etm: perf: Sink selection using sysfs is deprecated").
That commit alone would, however, likely not solve the problem.
It looks like at least two more commits would be needed.

716f5652a131 coresight: etm: perf: Fix warning caused by etm_setup_aux failure
8e264c52e1da coresight: core: Allow the coresight core driver to be built as a module
39a7661dcf65 coresight: Fix uninitialised pointer bug in etm_setup_aux()

Looking into the coresight code, I see several additional commits affecting
the sysfs interface since v5.4. I have no idea what would actually be needed
for stable code in v5.4.y, short of applying them all.

With all this in mind, I would suggest to revert commit 8fd52a21ab
("coresight: Make sysfs functional on topologies with per core sink")
from v5.4.y, especially since it is not marked as bug fix or for stable.

Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-11-10 12:37:31 +01:00
arch arm64/smp: Move rcu_cpu_starting() earlier 2020-11-10 12:37:31 +01:00
block blk-cgroup: Pre-allocate tree node on blkg_conf_prep 2020-11-10 12:37:30 +01:00
certs
crypto
Documentation linkage: Introduce new macros for assembler symbols 2020-11-10 12:37:24 +01:00
drivers Revert "coresight: Make sysfs functional on topologies with per core sink" 2020-11-10 12:37:31 +01:00
fs gfs2: Wake up when sd_glock_disposal becomes zero 2020-11-10 12:37:27 +01:00
include mm: always have io_remap_pfn_range() set pgprot_decrypted() 2020-11-10 12:37:27 +01:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2020-11-05 11:43:16 +01:00
ipc
kernel futex: Handle transient "ownerless" rtmutex state correctly 2020-11-10 12:37:28 +01:00
lib lib/crc32test: remove extra local_irq_disable/enable 2020-11-10 12:37:27 +01:00
LICENSES
mm mm: mempolicy: fix potential pte_unmap_unlock pte error 2020-11-10 12:37:27 +01:00
net vsock: use ns_capable_noaudit() on socket create 2020-11-10 12:37:30 +01:00
samples samples/bpf: Fix possible deadlock in xdpsock 2020-11-05 11:43:17 +01:00
scripts
security
sound ALSA: usb-audio: Add implicit feedback quirk for MODX 2020-11-10 12:37:27 +01:00
tools perf python scripting: Fix printable strings in python3 scripts 2020-11-05 11:43:32 +01:00
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Makefile Linux 5.4.75 2020-11-05 11:43:38 +01:00
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.