linux-toradex.git/arch/sparc/kernel, branch v3.4.35

sparc64: not any error from do_sigaltstack() should fail rt_sigreturn()

2012-12-03T19:47:10+00:00

commit fae2ae2a900a5c7bb385fe4075f343e7e2d5daa2 upstream.

If a signal handler is executed on altstack and another signal comes,
we will end up with rt_sigreturn() on return from the second handler
getting -EPERM from do_sigaltstack().  It's perfectly OK, since we
are not asking to change the settings; in fact, they couldn't have been
changed during the second handler execution exactly because we'd been
on altstack all along.  64bit sigreturn on sparc treats any error from
do_sigaltstack() as "SIGSEGV now"; we need to switch to the same semantics
we are using on other architectures.

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

sparc64: do not clobber personality flags in sys_sparc64_personality()

2012-10-28T17:14:16+00:00

[ Upstream commit a27032eee8cb6e16516f13c8a9752e9d5d4cc430 ]

There are multiple errors in how sys_sparc64_personality() handles
personality flags stored in top three bytes.

- directly comparing current->personality against PER_LINUX32 doesn't work
  in cases when any of the personality flags stored in the top three bytes
  are used.
- directly forcefully setting personality to PER_LINUX32 or PER_LINUX
  discards any flags stored in the top three bytes

Fix the first one by properly using personality() macro to compare only
PER_MASK bytes.
Fix the second one by setting only the bits that should be set, instead of
overwriting the whole value.

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

sparc64: Fix bit twiddling in sparc_pmu_enable_event().

2012-10-28T17:14:16+00:00

[ Upstream commit e793d8c6740f8fe704fa216e95685f4d92c4c4b9 ]

There was a serious disconnect in the logic happening in
sparc_pmu_disable_event() vs. sparc_pmu_enable_event().

Event disable is implemented by programming a NOP event into the PCR.

However, event enable was not reversing this operation.  Instead, it
was setting the User/Priv/Hypervisor trace enable bits.

That's not sparc_pmu_enable_event()'s job, that's what
sparc_pmu_enable() and sparc_pmu_disable() do .

The intent of sparc_pmu_enable_event() is clear, since it first clear
out the event type encoding field.  So fix this by OR'ing in the event
encoding rather than the trace enable bits.

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

sparc64: Like x86 we should check current->mm during perf backtrace generation.

2012-10-28T17:14:16+00:00

[ Upstream commit 08280e6c4c2e8049ac61d9e8e3536ec1df629c0d ]

If the MM is not active, only report the top-level PC.  Do not try to
access the address space.

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

sparc64: fix ptrace interaction with force_successful_syscall_return()

2012-10-28T17:14:16+00:00

[ Upstream commit 55c2770e413e96871147b9406a9c41fe9bc5209c ]

we want syscall_trace_leave() called on exit from any syscall;
skipping its call in case we'd done force_successful_syscall_return()
is broken...

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

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

2012-06-01T07:18:16+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().

2012-05-10T18:00:46+00:00

%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

sparc32,leon: add notify_cpu_starting()

2012-04-21T20:35:06+00:00

Otherwise cpu_active_mask will not set, which lead to other issue.

Signed-off-by: Yong Zhang 
Signed-off-by: Konrad Eisele 
Reviewed-by: Srivatsa S. Bhat 
Signed-off-by: David S. Miller

kill mm argument of vm_munmap()

2012-04-21T05:58:20+00:00

it's always current->mm

Signed-off-by: Al Viro

VM: add "vm_munmap()" helper function

2012-04-21T00:29:13+00:00

Like the vm_brk() function, this is the same as "do_munmap()", except it
does the VM locking for the caller.

Signed-off-by: Linus Torvalds