linux-toradex.git/arch/x86/math-emu, branch v3.6.3

x86: Rename trap_no to trap_nr in thread_struct

2012-03-13T05:24:09+00:00

There are precedences of trap number being referred to as
trap_nr. However thread struct refers trap number as trap_no.
Change it to trap_nr.

Also use enum instead of left-over literals for trap values.

This is pure cleanup, no functional change intended.

Suggested-by: Ingo Molnar 
Signed-off-by: Srikar Dronamraju 
Cc: Linus Torvalds 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Cc: Linux-mm 
Cc: Oleg Nesterov 
Cc: Andi Kleen 
Cc: Christoph Hellwig 
Cc: Steven Rostedt 
Cc: Arnaldo Carvalho de Melo 
Cc: Masami Hiramatsu 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20120312092555.5379.942.sendpatchset@srdronam.in.ibm.com
[ Fixed the math-emu build ]
Signed-off-by: Ingo Molnar

x86, fpu: Unbreak FPU emulation

2010-05-10T20:37:16+00:00

Unbreak FPU emulation, broken by checkin
86603283326c9e95e5ad4e9fdddeec93cac5d9ad:
x86: Introduce 'struct fpu' and related API

Signed-off-by: H. Peter Anvin 
Cc: Avi Kivity 
Cc: Suresh Siddha 
LKML-Reference: <1273135546-29690-3-git-send-email-avi@redhat.com>

x86: Introduce 'struct fpu' and related API

2010-05-10T17:48:55+00:00

Currently all fpu state access is through tsk->thread.xstate.  Since we wish
to generalize fpu access to non-task contexts, wrap the state in a new
'struct fpu' and convert existing access to use an fpu API.

Signal frame handlers are not converted to the API since they will remain
task context only things.

Signed-off-by: Avi Kivity 
Acked-by: Suresh Siddha 
LKML-Reference: <1273135546-29690-3-git-send-email-avi@redhat.com>
Signed-off-by: H. Peter Anvin

Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2

2009-03-27T16:28:43+00:00

Conflicts:
	arch/parisc/kernel/irq.c
	arch/x86/include/asm/fixmap_64.h
	arch/x86/include/asm/setup.h
	kernel/irq/handle.c

Semantic merge:
        arch/x86/include/asm/fixmap.h

Signed-off-by: Ingo Molnar

x86, math-emu: fix init_fpu for task != current

2009-03-04T19:33:16+00:00

Impact: fix math-emu related crash while using GDB/ptrace

init_fpu() calls finit to initialize a task's xstate, while finit always
works on the current task. If we use PTRACE_GETFPREGS on another
process and both processes did not already use floating point, we get
a null pointer exception in finit.

This patch creates a new function finit_task that takes a task_struct
parameter. finit becomes a wrapper that simply calls finit_task with
current. On the plus side this avoids many calls to get_current which
would each resolve to an inline assembler mov instruction.

An empty finit_task has been added to i387.h to avoid linker errors in
case the compiler still emits the call in init_fpu when
CONFIG_MATH_EMULATION is not defined.

The declaration of finit in i387.h has been removed as the remaining
code using this function gets its prototype from fpu_proto.h.

Signed-off-by: Daniel Glöckner 
Cc: Suresh Siddha 
Cc: "Pallipadi Venkatesh" 
Cc: Arjan van de Ven 
Cc: Bill Metzenthen 
LKML-Reference: 
Signed-off-by: Ingo Molnar

x86: add %gs accessors for x86_32

2009-02-09T23:41:58+00:00

Impact: cleanup

On x86_32, %gs is handled lazily.  It's not saved and restored on
kernel entry/exit but only when necessary which usually is during task
switch but there are few other places.  Currently, it's done by
calling savesegment() and loadsegment() explicitly.  Define
get_user_gs(), set_user_gs() and task_user_gs() and use them instead.

While at it, clean up register access macros in signal.c.

This cleans up code a bit and will help future changes.

Signed-off-by: Tejun Heo 
Signed-off-by: Ingo Molnar

x86: fix math_emu register frame access

2009-02-09T23:39:14+00:00

do_device_not_available() is the handler for #NM and it declares that
it takes a unsigned long and calls math_emu(), which takes a long
argument and surprisingly expects the stack frame starting at the zero
argument would match struct math_emu_info, which isn't true regardless
of configuration in the current code.

This patch makes do_device_not_available() take struct pt_regs like
other exception handlers and initialize struct math_emu_info with
pointer to it and pass pointer to the math_emu_info to math_emulate()
like normal C functions do.  This way, unless gcc makes a copy of
struct pt_regs in do_device_not_available(), the register frame is
correctly accessed regardless of kernel configuration or compiler
used.

This doesn't fix all math_emu problems but it at least gets it
somewhat working.

Signed-off-by: Tejun Heo 
Signed-off-by: Ingo Molnar

x86: math_emu info cleanup

2009-02-09T13:56:39+00:00

Impact: cleanup

* Come on, struct info?  s/struct info/struct math_emu_info/

* Use struct pt_regs and kernel_vm86_regs instead of defining its own
  register frame structure.

Signed-off-by: Tejun Heo 
Signed-off-by: Ingo Molnar

x86: coding style fixes to arch/x86/math-emu/reg_constant

2008-06-18T13:00:13+00:00

Before:
total: 6 errors, 1 warnings, 117 lines checked

After:
total: 0 errors, 1 warnings, 117 lines checked

paolo@paolo-desktop:~/linux.trees.git$ md5sum /tmp/reg_constant.o.*
780388a3056d58fb759efaf190d5d3d1  /tmp/reg_constant.o.after
780388a3056d58fb759efaf190d5d3d1  /tmp/reg_constant.o.before

paolo@paolo-desktop:~/linux.trees.git$ size /tmp/reg_constant.o.*
   text    data     bss     dec     hex filename
    457       0       0     457     1c9 /tmp/reg_constant.o.after
    457       0       0     457     1c9 /tmp/reg_constant.o.before

Signed-off-by: Paolo Ciarrocchi 
Signed-off-by: Ingo Molnar

x86: fix broken math-emu with lazy allocation of fpu area

2008-06-04T11:11:46+00:00

Fix the math emulation that got broken with the recent lazy allocation of FPU
area. init_fpu() need to be added for the math-emulation path aswell
for the FPU area allocation.

math emulation enabled kernel booted fine with this, in the presence
of "no387 nofxsr" boot param.

Signed-off-by: Suresh Siddha 
Cc: hpa@zytor.com
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner