Commit da1ba891 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 

* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] guest page hinting light
  [S390] tty3270: fix put_char fail/success conversion.
  [S390] compat ptrace cleanup
  [S390] s390mach compile warning
  [S390] cio: Fix parsing mechanism for blacklisted devices.
  [S390] cio: Remove cio_msg kernel parameter.
  [S390] s390-kvm: leave sie context on work. Removes preemption requirement
  [S390] s390: Optimize user and work TIF check
parents 8b2cc917 45e576b1

Documentation/s390/CommonIO

+0 −11
Original line number Diff line number Diff line
@@ -8,17 +8,6 @@ Command line parameters 


  Enable logging of debug information in case of ccw device timeouts.





* cio_msg = yes | no

  

  Determines whether information on found devices and sensed device 

  characteristics should be shown during startup or when new devices are

  found, i. e. messages of the types "Detected device 0.0.4711 on subchannel

  0.0.0042" and "SenseID: Device 0.0.4711 reports: ...".



  Default is off.





* cio_ignore = {all} |

	       {<device> | <range of devices>} |

	       {!<device> | !<range of devices>}

arch/s390/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -430,6 +430,13 @@ config CMM_IUCV 
	  Select this option to enable the special message interface to

	  the cooperative memory management.



config PAGE_STATES

	bool "Unused page notification"

	help

	  This enables the notification of unused pages to the

	  hypervisor. The ESSA instruction is used to do the states

	  changes between a page that has content and the unused state.



config VIRT_TIMER

	bool "Virtual CPU timer support"

	help

arch/s390/kernel/compat_wrapper.S

+1 −1
Original line number Diff line number Diff line
@@ -121,7 +121,7 @@ sys32_ptrace_wrapper: 
	lgfr	%r3,%r3			# long

	llgtr	%r4,%r4			# long

	llgfr	%r5,%r5			# long

	jg	sys_ptrace		# branch to system call

	jg	compat_sys_ptrace	# branch to system call



	.globl	sys32_alarm_wrapper

sys32_alarm_wrapper:

arch/s390/kernel/entry.S

+14 −15
Original line number Diff line number Diff line
@@ -279,8 +279,6 @@ sysc_do_restart: 
	st	%r2,SP_R2(%r15)   # store return value (change R2 on stack)



sysc_return:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

	bno	BASED(sysc_restore)

	tm	__TI_flags+3(%r9),_TIF_WORK_SVC

	bnz	BASED(sysc_work)  # there is work to do (signals etc.)

sysc_restore:
@@ -312,6 +310,8 @@ sysc_work_loop: 
# One of the work bits is on. Find out which one.

#

sysc_work:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

	bno	BASED(sysc_restore)

	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING

	bo	BASED(sysc_mcck_pending)

	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
@@ -602,12 +602,6 @@ io_no_vtime: 
	la	%r2,SP_PTREGS(%r15)	# address of register-save area

	basr	%r14,%r1		# branch to standard irq handler

io_return:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

#ifdef CONFIG_PREEMPT

	bno	BASED(io_preempt)	# no -> check for preemptive scheduling

#else

	bno	BASED(io_restore)	# no-> skip resched & signal

#endif

	tm	__TI_flags+3(%r9),_TIF_WORK_INT

	bnz	BASED(io_work)		# there is work to do (signals etc.)

io_restore:
@@ -629,10 +623,18 @@ io_restore_trace_psw: 
	.long	0, io_restore_trace + 0x80000000

#endif



#ifdef CONFIG_PREEMPT

io_preempt:

#

# switch to kernel stack, then check the TIF bits

#

io_work:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

#ifndef CONFIG_PREEMPT

	bno	BASED(io_restore)	# no-> skip resched & signal

#else

	bnz	BASED(io_work_user)	# no -> check for preemptive scheduling

	# check for preemptive scheduling

	icm	%r0,15,__TI_precount(%r9)

	bnz	BASED(io_restore)

	bnz	BASED(io_restore)	# preemption disabled

	l	%r1,SP_R15(%r15)

	s	%r1,BASED(.Lc_spsize)

	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
@@ -646,10 +648,7 @@ io_resume_loop: 
	br	%r1			# call schedule

#endif



#

# switch to kernel stack, then check the TIF bits

#

io_work:

io_work_user:

	l	%r1,__LC_KERNEL_STACK

	s	%r1,BASED(.Lc_spsize)

	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)

arch/s390/kernel/entry64.S

+42 −15
Original line number Diff line number Diff line
@@ -271,8 +271,6 @@ sysc_noemu: 
	stg	%r2,SP_R2(%r15) # store return value (change R2 on stack)



sysc_return:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

	jno	sysc_restore

	tm	__TI_flags+7(%r9),_TIF_WORK_SVC

	jnz	sysc_work	# there is work to do (signals etc.)

sysc_restore:
@@ -304,6 +302,8 @@ sysc_work_loop: 
# One of the work bits is on. Find out which one.

#

sysc_work:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

	jno	sysc_restore

	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING

	jo	sysc_mcck_pending

	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
@@ -585,12 +585,6 @@ io_no_vtime: 
	la	%r2,SP_PTREGS(%r15)	# address of register-save area

	brasl	%r14,do_IRQ		# call standard irq handler

io_return:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

#ifdef CONFIG_PREEMPT

	jno	io_preempt		# no -> check for preemptive scheduling

#else

	jno	io_restore		# no-> skip resched & signal

#endif

	tm	__TI_flags+7(%r9),_TIF_WORK_INT

	jnz	io_work 		# there is work to do (signals etc.)

io_restore:
@@ -612,10 +606,41 @@ io_restore_trace_psw: 
	.quad	0, io_restore_trace

#endif



#ifdef CONFIG_PREEMPT

io_preempt:

#

# There is work todo, we need to check if we return to userspace, then

# check, if we are in SIE, if yes leave it

#

io_work:

	tm	SP_PSW+1(%r15),0x01	# returning to user ?

#ifndef CONFIG_PREEMPT

#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)

	jnz	io_work_user		# yes -> no need to check for SIE

	la	%r1, BASED(sie_opcode)	# we return to kernel here

	lg	%r2, SP_PSW+8(%r15)

	clc	0(2,%r1), 0(%r2)	# is current instruction = SIE?

	jne	io_restore		# no-> return to kernel

	lg	%r1, SP_PSW+8(%r15)	# yes-> add 4 bytes to leave SIE

	aghi	%r1, 4

	stg	%r1, SP_PSW+8(%r15)

	j	io_restore		# return to kernel

#else

	jno	io_restore		# no-> skip resched & signal

#endif

#else

	jnz	io_work_user		# yes -> do resched & signal

#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)

	la	%r1, BASED(sie_opcode)

	lg	%r2, SP_PSW+8(%r15)

	clc	0(2,%r1), 0(%r2)	# is current instruction = SIE?

	jne	0f			# no -> leave PSW alone

	lg	%r1, SP_PSW+8(%r15)	# yes-> add 4 bytes to leave SIE

	aghi	%r1, 4

	stg	%r1, SP_PSW+8(%r15)

0:

#endif

	# check for preemptive scheduling

	icm	%r0,15,__TI_precount(%r9)

	jnz	io_restore

	jnz	io_restore		# preemption is disabled

	# switch to kernel stack

	lg	%r1,SP_R15(%r15)

	aghi	%r1,-SP_SIZE
@@ -629,10 +654,7 @@ io_resume_loop: 
	jg	preempt_schedule_irq

#endif



#

# switch to kernel stack, then check TIF bits

#

io_work:

io_work_user:

	lg	%r1,__LC_KERNEL_STACK

	aghi	%r1,-SP_SIZE

	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
@@ -653,6 +675,11 @@ io_work_loop: 
	j	io_restore

io_work_done:



#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)

sie_opcode:

	.long 0xb2140000

#endif



#

# _TIF_MCCK_PENDING is set, call handler

#

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