Vineet Gupta e78fdfef84 ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff ... This is to workaround the llock/scond livelock HS38x4 could get into a LLOCK/SCOND livelock in case of multiple overlapping coherency transactions in the SCU. The exclusive line state keeps rotating among contenting cores leading to a never ending cycle. So break the cycle by deferring the retry of failed exclusive access (SCOND). The actual delay needed is function of number of contending cores as well as the unrelated coherency traffic from other cores. To keep the code simple, start off with small delay of 1 which would suffice most cases and in case of contention double the delay. Eventually the delay is sufficient such that the coherency pipeline is drained, thus a subsequent exclusive access would succeed. Link: http://lkml.kernel.org/r/1438612568-28265-1-git-send-email-vgupta@synopsys.com Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>		2015-08-04 09:26:34 +05:30
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alpha	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
arc	ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff	2015-08-04 09:26:34 +05:30
arm	ARM: SoC fixes for v4.2	2015-07-19 13:37:44 -07:00
arm64	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
avr32	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
blackfin	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
c6x	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
cris	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
frv	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
h8300	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
hexagon	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
ia64	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
m32r	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
m68k	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
metag	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
microblaze	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
mips	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2015-07-19 14:12:22 -07:00
mn10300	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
nios2	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
openrisc	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
parisc	parisc: mm: Fix a memory leak related to pmd not attached to the pgd	2015-07-19 08:56:14 +02:00
powerpc	powerpc/perf/24x7: Fix lockdep warning	2015-07-08 15:18:04 +10:00
s390	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
score	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
sh	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
sparc	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
tile	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
um	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
unicore32	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
x86	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-18 10:49:57 -07:00
xtensa	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
.gitignore
Kconfig	x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86	2015-07-18 03:42:51 +02:00