linux-toradex.git/arch/mips/lib/mips-atomic.c, branch v4.19

MIPS: Cleanup the unused __arch_local_irq_restore() function

2016-01-22T00:58:49+00:00

In history, __arch_local_irq_restore() is only used by SMTC. However,
SMTC support has been removed since 3.16, this patch remove the unused
function.

Signed-off-by: Huacai Chen 
Cc: Aurelien Jarno 
Cc: Steven J. Hill 
Cc: Fuxin Zhang 
Cc: Zhangjin Wu 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12159/
Signed-off-by: Ralf Baechle

MIPS: asm: irqflags: Add MIPS R6 related definitions

2015-02-17T15:37:20+00:00

Add the MIPS R6 related definitions to the IRQ related macros

Signed-off-by: Markos Chandras

MIPS: lib: mips-atomic.c: Remove obsolete ifdefery

2014-11-24T06:45:33+00:00

Having #ifdefs just to guard comments is not really helpful
so drop them. Moreover, the code wasn't really reached anyway
since there is a #ifndef CONFIG_CPU_MIPSR2 on the top of the file.

Signed-off-by: Markos Chandras 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8513/
Signed-off-by: Ralf Baechle

MIPS: MT: Remove SMTC support

2014-05-23T22:07:01+00:00

Nobody is maintaining SMTC anymore and there also seems to be no userbase.
Which is a pity - the SMTC technology primarily developed by Kevin D.
Kissell  is an ingenious demonstration for the MT
ASE's power and elegance.

Based on Markos Chandras  patch
https://patchwork.linux-mips.org/patch/6719/ which while very similar did
no longer apply cleanly when I tried to merge it plus some additional
post-SMTC cleanup - SMTC was a feature as tricky to remove as it was to
merge once upon a time.

Signed-off-by: Ralf Baechle

MIPS: Get rid of the use of .macro in C code.

2013-04-11T13:39:51+00:00

It fails with LTO and probably has always been a fragile.

Signed-off-by: Ralf Baechle

MIPS: Fix crash that occurs when function tracing is enabled

2012-11-23T17:44:38+00:00

A recent patch changed some irq routines from inlines to functions.
These routines are called by the tracer code. Now that they're functions,
if they are compiled for function tracing they will call the tracer
and crash the system due to infinite recursion. The fix disables
tracing in these functions by using "notrace" in the function
definition.

Signed-off-by: Al Cooper 
Reviewed-by: David Daney 
Pathchwork: https://patchwork.linux-mips.org/patch/4564/
Signed-off-by: Ralf Baechle

MIPS: Make irqflags.h functions preempt-safe for non-mipsr2 cpus

2012-11-09T09:59:21+00:00

For non MIPSr2 processors, such as the BMIPS 5000, calls to
arch_local_irq_disable() and others may be preempted, and in doing
so a stale value may be restored to c0_status.  This fix disables
preemption for such processors prior to the call and enables it
after the call.

Those functions that needed this fix have been "outlined" to
mips-atomic.c, as they are no longer good candidates for inlining.

This bug was observed in a BMIPS 5000, occuring once every few hours
in a continuous reboot test.  It was traced to the write_lock_irq()
function which was being invoked in release_task() in exit.c.
By placing a number of "nops" inbetween the mfc0/mtc0 pair in
arch_local_irq_disable(), which is called by write_lock_irq(), we
were able to greatly increase the occurance of this bug.  Similarly,
the application of this commit silenced the bug.

Signed-off-by: Jim Quinlan 
Cc: linux-mips@linux-mips.org
Cc: David Daney 
Cc: Kevin Cernekee cernekee@gmail.com
Cc: Jim Quinlan 
Patchwork: https://patchwork.linux-mips.org/patch/4321/
Signed-off-by: Ralf Baechle