kernel.git/arch/s390/kernel, branch linux-2.6.28.y

s390 specific system call wrappers

2009-01-18T18:44:02Z

commit 26689452f5ca201add63b1b1ff0dbcf82d6885e7 upstream. Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman

Remove attribute((weak)) from sys_pipe/sys_pipe2

2009-01-18T18:43:51Z

commit 1134723e96f6e2abcf8bfd7a2d1c96fcc323ef35 upstream. Remove __attribute__((weak)) from common code sys_pipe implemantation. IA64, ALPHA, SUPERH (32bit) and SPARC (32bit) have own implemantations with the same name. Just rename them. For sys_pipe2 there is no architecture specific implementation. Cc: Richard Henderson Cc: David S. Miller Cc: Paul Mundt Cc: Tony Luck Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman

[S390] Fix alignment of initial kernel stack.

2008-11-27T10:06:58Z

We need an alignment of 16384 bytes for the initial kernel stack if the kernel is configured for 16384 bytes stacks but the linker script currently guarantees only an alignment of 8192 bytes. So fix this and simply use THREAD_SIZE as alignment value which will always do the right thing. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] fix/cleanup sched_clock

2008-11-27T10:06:57Z

CONFIG_PRINTK_TIME reveals that sched_clock has a wrong offset during boot: .. [ 0.000000] Movable zone: 0 pages used for memmap [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 775679 [ 0.000000] Kernel command line: dasd=4b6c root=/dev/dasda1 ro noinitrd [ 0.000000] PID hash table entries: 4096 (order: 12, 32768 bytes) [6920575.975232] console [ttyS0] enabled [6920575.987586] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes) [6920575.991404] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes) .. The s390 implementation of sched_clock uses the store clock instruction and subtracts jiffies_timer_cc. jiffies_timer_cc is a local variable in arch/s390/kernel/time.c and only used for sched_clock and monotonic clock. For historical reasons there is an offset on that value. With todays code this offset is unnecessary. By removing that offset we can get a sched_clock which returns the nanoseconds after time_init. This improves CONFIG_PRINTK_TIME. Since sched_clock is the only user, I have also renamed jiffies_timer_cc to sched_clock_base_cc. In addition, the local variable init_timer_cc is redundant and can be romved as well. Signed-off-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky

[S390] fix system call parameter functions.

2008-11-27T10:06:56Z

syscall_get_nr() currently returns a valid result only if the call chain of the traced process includes do_syscall_trace_enter(). But collect_syscall() can be called for any sleeping task, the result of syscall_get_nr() in general is completely bogus. To make syscall_get_nr() work for any sleeping task the traps field in pt_regs is replace with svcnr - the system call number the process is executing. If svcnr == 0 the process is not on a system call path. The syscall_get_arguments and syscall_set_arguments use regs->gprs[2] for the first system call parameter. This is incorrect since gprs[2] may have been overwritten with the system call number if the call chain includes do_syscall_trace_enter. Use regs->orig_gprs2 instead. Signed-off-by: Martin Schwidefsky

[S390] fix s390x_newuname

2008-11-14T17:18:55Z

The uname system call for 64 bit compares current->personality without masking the upper 16 bits. If e.g. READ_IMPLIES_EXEC is set the result of a uname system call will always be s390x even if the process uses the s390 personality. Signed-off-by: Martin Schwidefsky

[S390] cpu topology: fix locking

2008-11-14T17:18:54Z

cpu_coregroup_map used to grab a mutex on s390 since it was only called from process context. Since c7c22e4d5c1fdebfac4dba76de7d0338c2b0d832 "block: add support for IO CPU affinity" this is not true anymore. It now also gets called from softirq context. To prevent possible deadlocks change this in architecture code and use a spinlock instead of a mutex. Cc: stable@kernel.org Cc: Jens Axboe Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] ftrace: fix kernel stack backchain walking

2008-11-14T17:18:53Z

With CONFIG_IRQSOFF_TRACER the trace_hardirqs_off() function includes a call to __builtin_return_address(1). But we calltrace_hardirqs_off() from early entry code. There we have just a single stack frame. So this results in a kernel stack backchain walk that would walk beyond the kernel stack. Following the NULL terminated backchain this results in a lowcore read access. To fix this we simply call trace_hardirqs_off_caller() and pass the current instruction pointer. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] ftrace: disable tracing on idle psw

2008-11-14T17:18:53Z

Disable tracing on idle psw. Otherwise it would give us huge preempt off times for idle. Which is rather pointless. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] lockdep: fix compile bug

2008-11-14T17:18:53Z

arch/s390/kernel/built-in.o: In function `cleanup_io_leave_insn': mem_detect.c:(.text+0x10592): undefined reference to `lockdep_sys_exit' Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

kernel.git/arch/s390/kernel, branch linux-2.6.28.y

s390 specific system call wrappers

Remove __attribute__((weak)) from sys_pipe/sys_pipe2

[S390] Fix alignment of initial kernel stack.

[S390] fix/cleanup sched_clock

[S390] fix system call parameter functions.

[S390] fix s390x_newuname

[S390] cpu topology: fix locking

[S390] ftrace: fix kernel stack backchain walking

[S390] ftrace: disable tracing on idle psw

[S390] lockdep: fix compile bug

Remove attribute((weak)) from sys_pipe/sys_pipe2