android_kernel_motorola_sm6375

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Filename	Latest commit message	Latest commit date
Christopher M. Riedl 405efc5980 powerpc/spinlocks: Fix oops in __spin_yield() on bare metal Booting w/ppc64le_defconfig + CONFIG_PREEMPT on bare metal results in the oops below due to calling into __spin_yield() when not running in an SPLPAR, which means lppaca pointers are NULL. We fixed a similar case previously in commit `a6201da34f` ("powerpc: Fix oops due to bad access of lppaca on bare metal"), by adding SPLPAR checks in lppaca_shared_proc(). However when PREEMPT is enabled we can call __spin_yield() directly from arch_spin_yield(). To fix it add spin_yield() and rw_yield() which check that shared-processor LPAR is enabled before calling the SPLPAR-only implementation of each. BUG: Kernel NULL pointer dereference at 0x00000100 Faulting instruction address: 0xc000000000097f88 Oops: Kernel access of bad area, sig: 7 [#1] LE PAGE_SIZE=64K MMU=Radix MMU=Hash PREEMPT SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 2 Comm: kthreadd Not tainted 5.2.0-rc6-00491-g249155c20f9b #28 NIP: c000000000097f88 LR: c000000000c07a88 CTR: c00000000015ca10 REGS: c0000000727079f0 TRAP: 0300 Not tainted (5.2.0-rc6-00491-g249155c20f9b) MSR: 9000000002009033 <SF,HV,VEC,EE,ME,IR,DR,RI,LE> CR: 84000424 XER: 20040000 CFAR: c000000000c07a84 DAR: 0000000000000100 DSISR: 00080000 IRQMASK: 1 GPR00: c000000000c07a88 c000000072707c80 c000000001546300 c00000007be38a80 GPR04: c0000000726f0c00 0000000000000002 c00000007279c980 0000000000000100 GPR08: c000000001581b78 0000000080000001 0000000000000008 c00000007279c9b0 GPR12: 0000000000000000 c000000001730000 c000000000142558 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: c00000007be38a80 c000000000c002f4 0000000000000000 0000000000000000 GPR28: c000000072221a00 c0000000726c2600 c00000007be38a80 c00000007be38a80 NIP [c000000000097f88] __spin_yield+0x48/0xa0 LR [c000000000c07a88] __raw_spin_lock+0xb8/0xc0 Call Trace: [c000000072707c80] [c000000072221a00] 0xc000000072221a00 (unreliable) [c000000072707cb0] [c000000000bffb0c] __schedule+0xbc/0x850 [c000000072707d70] [c000000000c002f4] schedule+0x54/0x130 [c000000072707da0] [c0000000001427dc] kthreadd+0x28c/0x2b0 [c000000072707e20] [c00000000000c1cc] ret_from_kernel_thread+0x5c/0x70 Instruction dump: 4d9e0020 552a043e 210a07ff 79080fe0 0b080000 3d020004 3908b878 794a1f24 e8e80000 7ce7502a e8e70000 38e70100 <7ca03c2c> 70a70001 78a50020 4d820020 ---[ end trace 474d6b2b8fc5cb7e ]--- Fixes: `499dcd4137` ("powerpc/64s: Allocate LPPACAs individually") Signed-off-by: Christopher M. Riedl <cmr@informatik.wtf> [mpe: Reword change log a bit] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190813031314.1828-4-cmr@informatik.wtf		2019-08-27 21:34:34 +10:00
arch	powerpc/spinlocks: Fix oops in __spin_yield() on bare metal	2019-08-27 21:34:34 +10:00
block
certs
crypto
Documentation	powerpc: Document xmon options	2019-08-22 23:12:47 +10:00
drivers	Merge branch 'fixes' into next	2019-08-19 12:43:13 +10:00
fs
include	extable: Add function to search only kernel exception table	2019-08-21 22:23:48 +10:00
init
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kernel	extable: Add function to search only kernel exception table	2019-08-21 22:23:48 +10:00
lib
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security	meminit fix	2019-07-28 12:33:15 -07:00
sound
tools	selftests/powerpc: Retry on host facility unavailable	2019-08-26 10:47:54 +10:00
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Makefile	Linux 5.3-rc2	2019-07-28 12:47:02 -07:00
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.