linux-toradex.git/arch/sparc, branch PD13.2.1

KEYS: Use the compat keyctl() syscall wrapper on Sparc64 for Sparc32 compat

2012-06-01T07:12:54+00:00

commit 45de6767dc51358a188f75dc4ad9dfddb7fb9480 upstream.

Use the 32-bit compat keyctl() syscall wrapper on Sparc64 for Sparc32 binary
compatibility.

Without this, keyctl(KEYCTL_INSTANTIATE_IOV) is liable to malfunction as it
uses an iovec array read from userspace - though the kernel should survive this
as it checks pointers and sizes anyway.

I think all the other keyctl() function should just work, provided (a) the top
32-bits of each 64-bit argument register are cleared prior to invoking the
syscall routine, and the 32-bit address space is right at the 0-end of the
64-bit address space.  Most of the arguments are 32-bit anyway, and so for
those clearing is not required.

Signed-off-by: David Howells 
cc: sparclinux@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

sparc64: Do not clobber %g2 in xcall_fetch_glob_regs().

2012-05-21T16:40:01+00:00

[ Upstream commit a5a737e090e25981e99d69f01400e3a80356581c ]

%g2 is meant to hold the CPUID number throughout this routine, since
at the very beginning, and at the very end, we use %g2 to calculate
indexes into per-cpu arrays.

However we erroneously clobber it in order to hold the %cwp register
value mid-stream.

Fix this code to use %g3 for the %cwp read and related calulcations
instead.

Reported-by: Meelis Roos 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sparc64: Fix bootup crash on sun4v.

2012-04-22T23:21:24+00:00

commit 9e0daff30fd7ecf698e5d20b0fa7f851e427cca5 upstream.

The DS driver registers as a subsys_initcall() but this can be too
early, in particular this risks registering before we've had a chance
to allocate and setup module_kset in kernel/params.c which is
performed also as a subsyts_initcall().

Register DS using device_initcall() insteal.

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sparc64: Eliminate obsolete __handle_softirq() function

2012-04-22T23:21:24+00:00

commit 3d3eeb2ef26112a200785e5fca58ec58dd33bf1e upstream.

The invocation of softirq is now handled by irq_exit(), so there is no
need for sparc64 to invoke it on the trap-return path.  In fact, doing so
is a bug because if the trap occurred in the idle loop, this invocation
can result in lockdep-RCU failures.  The problem is that RCU ignores idle
CPUs, and the sparc64 trap-return path to the softirq handlers fails to
tell RCU that the CPU must be considered non-idle while those handlers
are executing.  This means that RCU is ignoring any RCU read-side critical
sections in those handlers, which in turn means that RCU-protected data
can be yanked out from under those read-side critical sections.

The shiny new lockdep-RCU ability to detect RCU read-side critical sections
that RCU is ignoring located this problem.

The fix is straightforward: Make sparc64 stop manually invoking the
softirq handlers.

Reported-by: Meelis Roos 
Suggested-by: David Miller 
Signed-off-by: Paul E. McKenney 
Tested-by: Meelis Roos 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sparc32: Add -Av8 to assembler command line.

2012-03-19T15:57:59+00:00

commit e0adb9902fb338a9fe634c3c2a3e474075c733ba upstream.

Newer version of binutils are more strict about specifying the
correct options to enable certain classes of instructions.

The sparc32 build is done for v7 in order to support sun4c systems
which lack hardware integer multiply and divide instructions.

So we have to pass -Av8 when building the assembler routines that
use these instructions and get patched into the kernel when we find
out that we have a v8 capable cpu.

Reported-by: Paul Gortmaker 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sparc: Fix handling of orig_i0 wrt. debugging when restarting syscalls.

2012-01-06T22:14:05+00:00

[ A combination of upstream commits 1d299bc7732c34d85bd43ac1a8745f5a2fed2078 and
  e88d2468718b0789b4c33da2f7e1cef2a1eee279 ]

Although we provide a proper way for a debugger to control whether
syscall restart occurs, we run into problems because orig_i0 is not
saved and restored properly.

Luckily we can solve this problem without having to make debuggers
aware of the issue.  Across system calls, several registers are
considered volatile and can be safely clobbered.

Therefore we use the pt_regs save area of one of those registers, %g6,
as a place to save and restore orig_i0.

Debuggers transparently will do the right thing because they save and
restore this register already.

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sparc64: Fix masking and shifting in VIS fpcmp emulation.

2012-01-06T22:14:04+00:00

[ Upstream commit 2e8ecdc008a16b9a6c4b9628bb64d0d1c05f9f92 ]

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sparc32: Correct the return value of memcpy.

2012-01-06T22:14:04+00:00

[ Upstream commit a52312b88c8103e965979a79a07f6b34af82ca4b ]

Properly return the original destination buffer pointer.

Signed-off-by: David S. Miller 
Tested-by: Kjetil Oftedal 
Signed-off-by: Greg Kroah-Hartman

sparc32: Remove uses of %g7 in memcpy implementation.

2012-01-06T22:14:03+00:00

[ Upstream commit 21f74d361dfd6a7d0e47574e315f780d8172084a ]

This is setting things up so that we can correct the return
value, so that it properly returns the original destination
buffer pointer.

Signed-off-by: David S. Miller 
Tested-by: Kjetil Oftedal 
Signed-off-by: Greg Kroah-Hartman

sparc32: Remove non-kernel code from memcpy implementation.

2012-01-06T22:14:03+00:00

[ Upstream commit 045b7de9ca0cf09f1adc3efa467f668b89238390 ]

Signed-off-by: David S. Miller 
Tested-by: Kjetil Oftedal 
Signed-off-by: Greg Kroah-Hartman