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  1. 13 11月, 2009 1 次提交
    • C
      [S390] s390: fix single stepping on svc0 · bcc6525f
      由 Christian Borntraeger 提交于 
      On s390 there are two ways of specifying the system call number for
the svc instruction. The standard way is to use the immediate field
in the instruction (or to use EXecute for values unknown during
assemble time). This can encode 256 system calls.
The kernel ABI also allows to put the system call number in r1 and
then execute svc 0 to enable system call numbers > 255.

It turns out that single stepping svc 0 is broken, since the PER
program check handler uses r1. We have to use a different register.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      bcc6525f
  3. 11 9月, 2009 1 次提交
  5. 26 8月, 2009 1 次提交
    • J
      tracing: Rename FTRACE_SYSCALLS for tracepoints · 66700001
      由 Josh Stone 提交于 
      s/HAVE_FTRACE_SYSCALLS/HAVE_SYSCALL_TRACEPOINTS/g
s/TIF_SYSCALL_FTRACE/TIF_SYSCALL_TRACEPOINT/g

The syscall enter/exit tracing is no longer specific to just ftrace, so
they now have names that reflect their tie to tracepoints instead.
Signed-off-by: NJosh Stone <jistone@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
LKML-Reference: <1251150194-1713-2-git-send-email-jistone@redhat.com>
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      66700001
  7. 12 6月, 2009 2 次提交
  9. 14 4月, 2009 1 次提交
  11. 31 12月, 2008 1 次提交
  13. 25 12月, 2008 2 次提交
    • M
      [S390] Remove config options. · c185b783
      由 Martin Schwidefsky 提交于 
      On s390 we always want to run with precise cputime accounting.
Remove the config options VIRT_TIMER and VIRT_CPU_ACCOUNTING.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      c185b783
    • A
      [S390] audit: get s390 ret_from_fork in sync with other architectures · 8f2961c3
      由 Al Viro 提交于 
      	On s390 we have ret_from_fork jump not to the "do all work we
normally do on return from syscall" as on x86, ppc, etc., but to the
"do all such work except audit".  Historical reasons - the codepath
triggered when we have AUDIT process flag set is separated from the
normall one and they converge at sysc_return, which is the common
part of post-syscall work.  And does not include calling audit_syscall_exit() -
that's done in the end of sysc_tracesys path, just before that path jumps
to sysc_return.

	IOW, the child returning from fork()/clone()/vfork() doesn't
call audit_syscall_exit() at all, so no matter what we do with its
audit context, we are not going to see the audit entry.

	The fix is simple: have ret_from_fork go to the point just past
the call of sys_.... in the 'we have AUDIT flag set' path.  There we
have (64bit variant; for 31bit the situation is the same):
sysc_tracenogo:
        tm      __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        jz      sysc_return
        la      %r2,SP_PTREGS(%r15)     # load pt_regs
        larl    %r14,sysc_return        # return point is sysc_return
        jg      do_syscall_trace_exit
which is precisely what we need - check the flag, bugger off to sysc_return
if not set, otherwise call do_syscall_trace_exit() and bugger off to
sysc_return.  r9 has just been properly set by ret_from_fork itself,
so we are fine.

	Tested on s390x, seems to work fine.  WARNING: it's been about
16 years since my last contact with 3X0 assembler[1], so additional
review would be very welcome.  I don't think I've managed to screw it
up, but...

[1] that *was* in another country and besides, the box is dead...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      8f2961c3
  15. 27 11月, 2008 1 次提交
    • M
      [S390] fix system call parameter functions. · 59da2139
      由 Martin Schwidefsky 提交于 
      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: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      59da2139
  17. 15 11月, 2008 2 次提交
  19. 11 10月, 2008 1 次提交
  21. 07 5月, 2008 1 次提交
    • M
      [S390] s390: Optimize user and work TIF check · 2688905e
      由 Martin Schwidefsky 提交于 
      On return from syscall or interrupt, we have to check if we return to
userspace (likely) and if there is work todo (less likely) to decide
if we handle the work. We can optimize this check: we first check for
the less likely work case and then check for userspace.

This patch is also a preparation for an additional patch, that fixes a bug
in KVM dealing with cpu bound guests.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      2688905e
  23. 30 4月, 2008 1 次提交
  25. 05 2月, 2008 1 次提交
  27. 04 12月, 2007 1 次提交
  29. 20 11月, 2007 2 次提交
  31. 12 10月, 2007 1 次提交
  33. 27 7月, 2007 1 次提交
    • H
      [S390] Fix IRQ tracing. · b771aeac
      由 Heiko Carstens 提交于 
      If a machine check is pending and the external or I/O interrupt handler
returns to userspace io_mcck_pending is going to call s390_handle_mcck.
Before this happens a call to TRACE_IRQS_ON was already made since we
know that we are going back to userspace and hence interrupts will be
enabled. So there was an indication that interrupts are enabled while
in reality they are still disabled.
s390_handle_mcck will do a local_irq_save/restore pair and confuse
lockdep which later complains about inconsistent irq tracing.
To solve this just call trace_hardirqs_off before calling
s390_handle_mcck and trace_hardirqs_on afterwards.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      b771aeac
  35. 10 7月, 2007 1 次提交
  37. 19 6月, 2007 1 次提交
  39. 27 4月, 2007 1 次提交
  41. 28 9月, 2006 1 次提交
  43. 20 9月, 2006 1 次提交
  45. 04 7月, 2006 1 次提交
  47. 02 7月, 2006 1 次提交
  49. 01 7月, 2006 1 次提交
  51. 29 6月, 2006 2 次提交
    • M
      [S390] remove export of sys_call_table · 8f27766a
      由 Martin Schwidefsky 提交于 
      Remove export of the sys_call_table symbol to prevent the misuse of it.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      8f27766a
    • M
      [S390] virtual cpu accounting vs. machine checks. · 63b12246
      由 Martin Schwidefsky 提交于 
      If a machine checks interrupts the external or the i/o interrupt
handler before they have completed the cpu time calculations, the
accounting goes wrong. After the cpu returned from the machine check
handler to the interrupted interrupt handler, a negative cpu time delta
can occur.  If the accumulated cpu time in lowcore is small enough
this value can get negative as well. The next jiffy interrupt will pick
up that negative value, shift it by 12 and add the now huge positive
value to the cpu time of the process.
To solve this the machine check handler is modified not to change any
of the timestamps in the lowcore if the machine check interrupted kernel
context.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      63b12246
  53. 02 2月, 2006 1 次提交
  55. 07 11月, 2005 1 次提交
  57. 18 9月, 2005 1 次提交
  59. 10 9月, 2005 1 次提交
  61. 05 9月, 2005 1 次提交
    • M
      [PATCH] s390: machine check handler bugs · ae6aa2ea
      由 Martin Schwidefsky 提交于 
      The new machine check handler still has a few bugs.

1) The system entry time has to be stored in the machine check handler,

2) the machine check return psw may not be stored at the usual place
   because it might overwrite the return psw of the interrupted context,

3) the return address for the call to s390_handle_mcck in the i/o interrupt
   handler is not correct,

4) the system call cleanup has to take the different save area of the
   machine check handler into account,

5) the machine check handler may not call UPDATE_VTIME before
   CREATE_STACK_FRAME, and

6) the io leave path needs a critical section cleanup to make sure that the
   TIF_MCCK_PENDING bit is really checked before switching back to user space.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      ae6aa2ea
  63. 28 7月, 2005 1 次提交
  65. 26 6月, 2005 1 次提交
  67. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      由 Linus Torvalds 提交于 
      Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
      1da177e4