linux-stable.git/arch/mips/kernel, branch v4.19.78

MIPS: Ingenic: Disable broken BTB lookup optimization.

2019-10-07T16:57:06+00:00

[ Upstream commit 053951dda71ecb4b554a2cdbe26f5f6f9bee9dd2 ]

In order to further reduce power consumption, the XBurst core
by default attempts to avoid branch target buffer lookups by
detecting & special casing loops. This feature will cause
BogoMIPS and lpj calculate in error. Set cp0 config7 bit 4 to
disable this feature.

Signed-off-by: Zhou Yanjie 
Signed-off-by: Paul Burton 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: ralf@linux-mips.org
Cc: paul@crapouillou.net
Cc: jhogan@kernel.org
Cc: malat@debian.org
Cc: gregkh@linuxfoundation.org
Cc: tglx@linutronix.de
Cc: allison@lohutok.net
Cc: syq@debian.org
Cc: chenhc@lemote.com
Cc: jiaxun.yang@flygoat.com
Signed-off-by: Sasha Levin

mips: fix cacheinfo

2019-08-29T06:28:27+00:00

[ Upstream commit b8bea8a5e5d942e62203416ab41edecaed4fda02 ]

Because CONFIG_OF defined for MIPS, cacheinfo attempts to fill information
from DT, ignoring data filled by architecture routine. This leads to error
reported

 cacheinfo: Unable to detect cache hierarchy for CPU 0

Way to fix this provided in
commit fac51482577d ("drivers: base: cacheinfo: fix x86 with
 CONFIG_OF enabled")

Utilize same mechanism to report that cacheinfo set by architecture
specific function

Signed-off-by: Vladimir Kondratiev 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Sasha Levin

MIPS: kernel: only use i8253 clocksource with periodic clockevent

2019-08-29T06:28:27+00:00

[ Upstream commit a07e3324538a989b7cdbf2c679be6a7f9df2544f ]

i8253 clocksource needs a free running timer. This could only
be used, if i8253 clockevent is set up as periodic.

Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Sasha Levin

MIPS: uprobes: remove set but not used variable 'epc'

2019-06-25T03:35:56+00:00

[ Upstream commit f532beeeff0c0a3586cc15538bc52d249eb19e7c ]

Fixes gcc '-Wunused-but-set-variable' warning:

arch/mips/kernel/uprobes.c: In function 'arch_uprobe_pre_xol':
arch/mips/kernel/uprobes.c:115:17: warning: variable 'epc' set but not used [-Wunused-but-set-variable]

It's never used since introduction in
commit 40e084a506eb ("MIPS: Add uprobes support.")

Signed-off-by: YueHaibing 
Signed-off-by: Paul Burton 
Cc: 
Cc: 
Cc: 
Cc: 
Signed-off-by: Sasha Levin

mips: Make sure dt memory regions are valid

2019-06-15T09:54:05+00:00

[ Upstream commit 93fa5b280761a4dbb14c5330f260380385ab2b49 ]

There are situations when memory regions coming from dts may be
too big for the platform physical address space. This especially
concerns XPA-capable systems. Bootloader may determine more than 4GB
memory available and pass it to the kernel over dts memory node, while
kernel is built without XPA/64BIT support. In this case the region
may either simply be truncated by add_memory_region() method
or by u64->phys_addr_t type casting. But in worst case the method
can even drop the memory region if it exceeds PHYS_ADDR_MAX size.
So lets make sure the retrieved from dts memory regions are valid,
and if some of them aren't, just manually truncate them with a warning
printed out.

Signed-off-by: Serge Semin 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: Mike Rapoport 
Cc: Andrew Morton 
Cc: Michal Hocko 
Cc: Greg Kroah-Hartman 
Cc: Thomas Bogendoerfer 
Cc: Huacai Chen 
Cc: Stefan Agner 
Cc: Stephen Rothwell 
Cc: Alexandre Belloni 
Cc: Juergen Gross 
Cc: Serge Semin 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Sasha Levin

jump_label: move 'asm goto' support test to Kconfig

2019-06-04T06:02:34+00:00

commit e9666d10a5677a494260d60d1fa0b73cc7646eb3 upstream.

Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label".

The jump label is controlled by HAVE_JUMP_LABEL, which is defined
like this:

  #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
  # define HAVE_JUMP_LABEL
  #endif

We can improve this by testing 'asm goto' support in Kconfig, then
make JUMP_LABEL depend on CC_HAS_ASM_GOTO.

Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will
match to the real kernel capability.

Signed-off-by: Masahiro Yamada 
Acked-by: Michael Ellerman  (powerpc)
Tested-by: Sedat Dilek 
[nc: Fix trivial conflicts in 4.19
     arch/xtensa/kernel/jump_label.c doesn't exist yet
     Ensured CC_HAVE_ASM_GOTO and HAVE_JUMP_LABEL were sufficiently
     eliminated]
Signed-off-by: Nathan Chancellor 
Signed-off-by: Greg Kroah-Hartman

MIPS: perf: Fix build with CONFIG_CPU_BMIPS5000 enabled

2019-05-25T16:23:33+00:00

commit 1b1f01b653b408ebe58fec78c566d1075d285c64 upstream.

arch/mips/kernel/perf_event_mipsxx.c: In function 'mipsxx_pmu_enable_event':
arch/mips/kernel/perf_event_mipsxx.c:326:21: error: unused variable 'event' [-Werror=unused-variable]
  struct perf_event *event = container_of(evt, struct perf_event, hw);
                     ^~~~~

Fix this by making use of IS_ENABLED() to simplify the code and avoid
unnecessary ifdefery.

Fixes: 84002c88599d ("MIPS: perf: Fix perf with MT counting other threads")
Signed-off-by: Florian Fainelli 
Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Cc: Peter Zijlstra 
Cc: Ingo Molnar 
Cc: Arnaldo Carvalho de Melo 
Cc: Alexander Shishkin 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: stable@vger.kernel.org # v4.18+
Signed-off-by: Greg Kroah-Hartman

MIPS: KGDB: fix kgdb support for SMP platforms.

2019-05-10T15:54:07+00:00

[ Upstream commit ab8a6d821179ab9bea1a9179f535ccba6330c1ed ]

KGDB_call_nmi_hook is called by other cpu through smp call.
MIPS smp call is processed in ipi irq handler and regs is saved in
 handle_int.
So kgdb_call_nmi_hook get regs by get_irq_regs and regs will be passed
 to kgdb_cpu_enter.

Signed-off-by: Chong Qiao 
Reviewed-by: Douglas Anderson 
Acked-by: Daniel Thompson 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: Will Deacon 
Cc: Christophe Leroy 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: QiaoChong 
Signed-off-by: Sasha Levin

MIPS: scall64-o32: Fix indirect syscall number load

2019-05-02T07:58:53+00:00

commit 79b4a9cf0e2ea8203ce777c8d5cfa86c71eae86e upstream.

Commit 4c21b8fd8f14 (MIPS: seccomp: Handle indirect system calls (o32))
added indirect syscall detection for O32 processes running on MIPS64,
but it did not work correctly for big endian kernel/processes. The
reason is that the syscall number is loaded from ARG1 using the lw
instruction while this is a 64-bit value, so zero is loaded instead of
the syscall number.

Fix the code by using the ld instruction instead. When running a 32-bit
processes on a 64 bit CPU, the values are properly sign-extended, so it
ensures the value passed to syscall_trace_enter is correct.

Recent systemd versions with seccomp enabled whitelist the getpid
syscall for their internal  processes (e.g. systemd-journald), but call
it through syscall(SYS_getpid). This fix therefore allows O32 big endian
systems with a 64-bit kernel to run recent systemd versions.

Signed-off-by: Aurelien Jarno 
Cc:  # v3.15+
Reviewed-by: Philippe Mathieu-Daudé 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

MIPS: Ensure ELF appended dtb is relocated

2019-03-27T05:14:39+00:00

commit 3f0a53bc6482fb09770982a8447981260ea258dc upstream.

This fixes booting with the combination of CONFIG_RELOCATABLE=y
and CONFIG_MIPS_ELF_APPENDED_DTB=y.

Sections that appear after the relocation table are not relocated
on system boot (except .bss, which has special handling).

With CONFIG_MIPS_ELF_APPENDED_DTB, the dtb is part of the
vmlinux ELF, so it must be relocated together with everything else.

Fixes: 069fd766271d ("MIPS: Reserve space for relocation table")
Signed-off-by: Yasha Cherikovsky 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: Paul Burton 
Cc: James Hogan 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Greg Kroah-Hartman