Revision e88d2468718b0789b4c33da2f7e1cef2a1eee279 authored by David S. Miller on 15 November 2011, 20:57:00 UTC, committed by David S. Miller on 15 November 2011, 20:57:00 UTC
As per the comments added by this commit, %g2 turns out to not be a
usable place to save away orig_i0 for syscall restart handling.

In fact all of %g2, %g3, %g4, and %g5 are assumed to be saved across
a system call by various bits of code in glibc.

%g1 can't be used because that holds the syscall number, which would
need to be saved and restored for syscall restart handling too, and
that would only compound our problems :-)

This leaves us with %g6 and %g7 which are for "system use".  %g7 is
used as the "thread register" by glibc, but %g6 is used as a compiler
and assembler temporary scratch register.  And in no instance is %g6
used to hold a value across a system call.

Therefore %g6 is safe for storing away orig_i0, at least for now.

Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 1d299bc
Raw File
Kconfig.locks
#
# The ARCH_INLINE foo is necessary because select ignores "depends on"
#
config ARCH_INLINE_SPIN_TRYLOCK
	bool

config ARCH_INLINE_SPIN_TRYLOCK_BH
	bool

config ARCH_INLINE_SPIN_LOCK
	bool

config ARCH_INLINE_SPIN_LOCK_BH
	bool

config ARCH_INLINE_SPIN_LOCK_IRQ
	bool

config ARCH_INLINE_SPIN_LOCK_IRQSAVE
	bool

config ARCH_INLINE_SPIN_UNLOCK
	bool

config ARCH_INLINE_SPIN_UNLOCK_BH
	bool

config ARCH_INLINE_SPIN_UNLOCK_IRQ
	bool

config ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
	bool


config ARCH_INLINE_READ_TRYLOCK
	bool

config ARCH_INLINE_READ_LOCK
	bool

config ARCH_INLINE_READ_LOCK_BH
	bool

config ARCH_INLINE_READ_LOCK_IRQ
	bool

config ARCH_INLINE_READ_LOCK_IRQSAVE
	bool

config ARCH_INLINE_READ_UNLOCK
	bool

config ARCH_INLINE_READ_UNLOCK_BH
	bool

config ARCH_INLINE_READ_UNLOCK_IRQ
	bool

config ARCH_INLINE_READ_UNLOCK_IRQRESTORE
	bool


config ARCH_INLINE_WRITE_TRYLOCK
	bool

config ARCH_INLINE_WRITE_LOCK
	bool

config ARCH_INLINE_WRITE_LOCK_BH
	bool

config ARCH_INLINE_WRITE_LOCK_IRQ
	bool

config ARCH_INLINE_WRITE_LOCK_IRQSAVE
	bool

config ARCH_INLINE_WRITE_UNLOCK
	bool

config ARCH_INLINE_WRITE_UNLOCK_BH
	bool

config ARCH_INLINE_WRITE_UNLOCK_IRQ
	bool

config ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
	bool

#
# lock_* functions are inlined when:
#   - DEBUG_SPINLOCK=n and GENERIC_LOCKBREAK=n and ARCH_INLINE_*LOCK=y
#
# trylock_* functions are inlined when:
#   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
#
# unlock and unlock_irq functions are inlined when:
#   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
#  or
#   - DEBUG_SPINLOCK=n and PREEMPT=n
#
# unlock_bh and unlock_irqrestore functions are inlined when:
#   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
#

config INLINE_SPIN_TRYLOCK
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_TRYLOCK

config INLINE_SPIN_TRYLOCK_BH
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_TRYLOCK_BH

config INLINE_SPIN_LOCK
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && ARCH_INLINE_SPIN_LOCK

config INLINE_SPIN_LOCK_BH
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_SPIN_LOCK_BH

config INLINE_SPIN_LOCK_IRQ
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_SPIN_LOCK_IRQ

config INLINE_SPIN_LOCK_IRQSAVE
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_SPIN_LOCK_IRQSAVE

config INLINE_SPIN_UNLOCK
	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK)

config INLINE_SPIN_UNLOCK_BH
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_BH

config INLINE_SPIN_UNLOCK_IRQ
	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK_BH)

config INLINE_SPIN_UNLOCK_IRQRESTORE
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE


config INLINE_READ_TRYLOCK
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_READ_TRYLOCK

config INLINE_READ_LOCK
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && ARCH_INLINE_READ_LOCK

config INLINE_READ_LOCK_BH
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_READ_LOCK_BH

config INLINE_READ_LOCK_IRQ
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_READ_LOCK_IRQ

config INLINE_READ_LOCK_IRQSAVE
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_READ_LOCK_IRQSAVE

config INLINE_READ_UNLOCK
	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_READ_UNLOCK)

config INLINE_READ_UNLOCK_BH
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_READ_UNLOCK_BH

config INLINE_READ_UNLOCK_IRQ
	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_READ_UNLOCK_BH)

config INLINE_READ_UNLOCK_IRQRESTORE
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_READ_UNLOCK_IRQRESTORE


config INLINE_WRITE_TRYLOCK
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_TRYLOCK

config INLINE_WRITE_LOCK
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && ARCH_INLINE_WRITE_LOCK

config INLINE_WRITE_LOCK_BH
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_WRITE_LOCK_BH

config INLINE_WRITE_LOCK_IRQ
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_WRITE_LOCK_IRQ

config INLINE_WRITE_LOCK_IRQSAVE
	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
		 ARCH_INLINE_WRITE_LOCK_IRQSAVE

config INLINE_WRITE_UNLOCK
	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_WRITE_UNLOCK)

config INLINE_WRITE_UNLOCK_BH
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_BH

config INLINE_WRITE_UNLOCK_IRQ
	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_WRITE_UNLOCK_BH)

config INLINE_WRITE_UNLOCK_IRQRESTORE
	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE

config MUTEX_SPIN_ON_OWNER
	def_bool SMP && !DEBUG_MUTEXES
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