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.
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.
Benjamin Poirier
authored
There have been multiple reports of crashes that look like kernel: RIP: 0010:[<ffffffff8110303f>] timecounter_read+0xf/0x50 [...] kernel: Call Trace: kernel: [<ffffffffa0806b0f>] e1000e_phc_gettime+0x2f/0x60 [e1000e] kernel: [<ffffffffa0806c5d>] e1000e_systim_overflow_work+0x1d/0x80 [e1000e] kernel: [<ffffffff810992c5>] process_one_work+0x155/0x440 kernel: [<ffffffff81099e16>] worker_thread+0x116/0x4b0 kernel: [<ffffffff8109f422>] kthread+0xd2/0xf0 kernel: [<ffffffff8163184f>] ret_from_fork+0x3f/0x70 These can be traced back to the fact that e1000e_systim_reset() skips the timecounter_init() call if e1000e_get_base_timinca() returns -EINVAL, which leads to a null deref in timecounter_read(). Commit 83129b37 ("e1000e: fix systim issues", v4.2-rc1) reworked e1000e_get_base_timinca() in such a way that it can return -EINVAL for e1000_pch_spt if the SYSCFI bit is not set in TSYNCRXCTL. Some experimentation has shown that on I219 (e1000_pch_spt, "MAC: 12") adapters, the E1000_TSYNCRXCTL_SYSCFI flag is unstable; TSYNCRXCTL reads sometimes don't have the SYSCFI bit set. Retrying the read shortly after finds the bit to be set. This was observed at boot (probe) but also link up and link down. Moreover, the phc (PTP Hardware Clock) seems to operate normally even after reads where SYSCFI=0. Therefore, remove this register read and unconditionally set the clock parameters. Reported-by:Achim Mildenberger <admin@fph.physik.uni-karlsruhe.de> Message-Id: <20180425065243.g5mqewg5irkwgwgv@f2> Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1075876 Fixes: 83129b37 ("e1000e: fix systim issues") Signed-off-by:
Benjamin Poirier <bpoirier@suse.com> Tested-by:
Aaron Brown <aaron.f.brown@intel.com> Signed-off-by:
Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
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| .get_maintainer.ignore | ||
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| COPYING | ||
| CREDITS | ||
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| Makefile | ||
| README |