linux-toradex.git/arch/parisc/include/asm, branch v4.4.61

parisc: Don't use BITS_PER_LONG in userspace-exported swab.h header

2017-02-01T07:30:53+00:00

commit 2ad5d52d42810bed95100a3d912679d8864421ec upstream.

In swab.h the "#if BITS_PER_LONG > 32" breaks compiling userspace programs if
BITS_PER_LONG is #defined by userspace with the sizeof() compiler builtin.

Solve this problem by using __BITS_PER_LONG instead.  Since we now
#include asm/bitsperlong.h avoid further potential userspace pollution
by moving the #define of SHIFT_PER_LONG to bitops.h which is not
exported to userspace.

This patch unbreaks compiling qemu on hppa/parisc.

Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: Purge TLB before setting PTE

2016-12-15T16:49:21+00:00

commit c78e710c1c9fbeff43dddc0aa3d0ff458e70b0cc upstream.

The attached change interchanges the order of purging the TLB and
setting the corresponding page table entry.  TLB purges are strongly
ordered.  It occurred to me one night that setting the PTE first might
have subtle ordering issues on SMP machines and cause random memory
corruption.

A TLB lock guards the insertion of user TLB entries.  So after the TLB
is purged, a new entry can't be inserted until the lock is released.
This ensures that the new PTE value is used when the lock is released.

Since making this change, no random segmentation faults have been
observed on the Debian hppa buildd servers.

Signed-off-by: John David Anglin  
Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: Increase initial kernel mapping size

2016-10-28T07:01:27+00:00

commit 65bf34f59594c11f13d371c5334a6a0a385cd7ae upstream.

Increase the initial kernel default page mapping size for 64-bit kernels to
64 MB and for 32-bit kernels to 32 MB.

Due to the additional support of ftrace, tracepoint and huge pages the kernel
size can exceed the sizes we used up to now.

Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: Increase KERNEL_INITIAL_SIZE for 32-bit SMP kernels

2016-10-28T07:01:26+00:00

commit 690d097c00c88fa9d93d198591e184164b1d8c20 upstream.

Increase the initial kernel default page mapping size for SMP kernels to 32MB
and add a runtime check which panics early if the kernel is bigger than the
initial mapping size.

This fixes boot crashes of 32bit SMP kernels. Due to the introduction of huge
page support in kernel 4.4 and it's required initial kernel layout in memory, a
32bit SMP kernel usually got bigger (in layout, not size) than 16MB.

Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: fix copy_from_user()

2016-09-24T08:07:45+00:00

commit aace880feea38875fbc919761b77e5732a3659ef upstream.

Signed-off-by: Al Viro 
Signed-off-by: Greg Kroah-Hartman

parisc: Unbreak handling exceptions from kernel modules

2016-04-20T06:41:52+00:00

commit 2ef4dfd9d9f288943e249b78365a69e3ea3ec072 upstream.

Handling exceptions from modules never worked on parisc.
It was just masked by the fact that exceptions from modules
don't happen during normal use.

When a module triggers an exception in get_user() we need to load the
main kernel dp value before accessing the exception_data structure, and
afterwards restore the original dp value of the module on exit.

Noticed-by: Mikulas Patocka 
Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: Protect huge page pte changes with spinlocks

2016-02-17T20:30:57+00:00

commit b0e551313ebde17764f3a5ed273df524d1e7e690 upstream.

PA-RISC doesn't have atomic instructions to modify page table entries, so it
takes spinlock in the TLB handler and modifies the page table entry
non-atomically. If you modify the page table entry without the spinlock, you
may race with TLB handler on another CPU and your modification may be lost.
Protect against that with usage of purge_tlb_start() and purge_tlb_end() which
handles the TLB spinlock.

Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: Disable huge pages on Mako machines

2015-12-12T15:45:23+00:00

Mako-based machines (PA8800 and PA8900 CPUs) don't allow aliasing on
non-equaivalent addresses.

Signed-off-by: Helge Deller

Merge branch 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2015-11-22T20:50:58+00:00

Pull parisc update from Helge Deller:
 "This patchset adds Huge Page and HUGETLBFS support for parisc"

Honestly, the hugepage support should have gone through in the merge
window, and is not really an rc-time fix.  But it only touches
arch/parisc, and I cannot find it in myself to care.  If one of the
three parisc users notices a breakage, I will point at Helge and make
rude farting noises.

* 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Map kernel text and data on huge pages
  parisc: Add Huge Page and HUGETLBFS support
  parisc: Use long branch to do_syscall_trace_exit
  parisc: Increase initial kernel mapping to 32MB on 64bit kernel
  parisc: Initialize the fault vector earlier in the boot process.
  parisc: Add defines for Huge page support
  parisc: Drop unused MADV_xxxK_PAGES flags from asm/mman.h
  parisc: Drop definition of start_thread_som for HP-UX SOM binaries
  parisc: Fix wrong comment regarding first pmd entry flags

parisc: Add Huge Page and HUGETLBFS support

2015-11-22T11:23:10+00:00

This patch adds huge page support to allow userspace to allocate huge
pages and to use hugetlbfs filesystem on 32- and 64-bit Linux kernels.
A later patch will add kernel support to map kernel text and data on
huge pages.

The only requirement is, that the kernel needs to be compiled for a
PA8X00 CPU (PA2.0 architecture). Older PA1.X CPUs do not support
variable page sizes. 64bit Kernels are compiled for PA2.0 by default.

Technically on parisc multiple physical huge pages may be needed to
emulate standard 2MB huge pages.

Signed-off-by: Helge Deller