linux/arch/tile/kernel, branch v4.5

tile: uninline dma_set_mask

2016-01-21T01:09:18Z

We'll soon merge into and the reference to dma_capable in the tile dma_set_mask would create a circular dependency. Fix this by moving the implementation out of line. Signed-off-by: Christoph Hellwig Cc: Chris Metcalf Cc: Christian Borntraeger Cc: Joerg Roedel Cc: Sebastian Ott Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

arch/tile: move user_exit() to early kernel entry sequence

2016-01-18T19:49:30Z

This ensures that we always notify context tracking that we have exited from user space no matter how we enter the kernel. It is similar to how arm64 handles context tracking, for example. This allows the removal of all the exception_enter() calls that were added in commit 49e4e15619cd ("tile: support CONTEXT_TRACKING and thus NOHZ_FULL"). Signed-off-by: Chris Metcalf

tile: fix bug in setting PT_FLAGS_DISABLE_IRQ on kernel entry

2016-01-18T19:49:26Z

This flag value is saved in ptregs and used to decide whether to disable irqs when returning from the kernel. Commit 1168df528fe4 ("tile: don't assume user privilege is zero") performed a bad merge from some KVM-enabled code that had not yet been upstreamed. The only issue with the old code is that we will read the interrupt mask in more conditions than we need to (e.g., coming from user space when user space has the Interrupt Critical Section bit set, or coming from a guest kernel), which is a slow multi-cycle operation. This change saves those few cycles in the common case. Signed-off-by: Chris Metcalf

tile: fix a -Wframe-larger-than warning

2016-01-18T19:49:19Z

The warning occurs in setup.c, where it is known that it can't be a problem, but it's still a good idea to silence the warning. The onstack array is converted from an s32 to a u8, which still is plenty of range for the values being managed there. Signed-off-by: Chris Metcalf

tile: include the syscall number in the backtrace

2016-01-18T19:49:16Z

This information is easily available in the backtrace data and can be helpful when trying to figure out the backtrace, particularly if we're early in kernel entry or late in kernel exit. Signed-off-by: Chris Metcalf

arch/tile: adopt prepare_exit_to_usermode() model from x86

2016-01-18T19:49:09Z

This change is a prerequisite change for TASK_ISOLATION but also stands on its own for readability and maintainability. The existing tile do_work_pending() was called in a loop from assembly on the slow path; this change moves the loop into C code as well. For the x86 version see commit c5c46f59e4e7 ("x86/entry: Add new, comprehensible entry and exit handlers written in C"). This change exposes a pre-existing bug on the older tilepro platform; the singlestep processing is done last, but on tilepro (unlike tilegx) we enable interrupts while doing that processing, so we could in theory miss a signal or other asynchronous event. A future change could fix this by breaking the singlestep work into a "prepare" step done in the main loop, and a "trigger" step done after exiting the loop. Since this change is intended as purely a restructuring change, we call out the bug explicitly now, but don't yet fix it. Signed-off-by: Chris Metcalf

tile/jump_label: add jump label support for TILE-Gx

2016-01-04T20:09:31Z

Add the arch-specific code to support jump label for TILE-Gx. This code shares NOP instruction with ftrace, so we move it to a common header file. Reviewed-by: Chris Metcalf Signed-off-by: Zhigang Lu Signed-off-by: Chris Metcalf

tile: define a macro ktext_writable_addr to get writable kernel text address

2016-01-04T20:09:31Z

It is used by kgdb, ftrace, kprobe and jump label, so we factor this out into a helper routine. Reviewed-by: Chris Metcalf Signed-off-by: Zhigang Lu Signed-off-by: Chris Metcalf

treewide: Remove old email address

2015-11-23T08:44:58Z

There were still a number of references to my old Red Hat email address in the kernel source. Remove these while keeping the Red Hat copyright notices intact. Signed-off-by: Peter Zijlstra (Intel) Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Signed-off-by: Ingo Molnar

Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2015-09-28T16:27:18Z

Pull arch/tile bugfix from Chris Metcalf: "This fixes a bug in 'make allmodconfig'" * 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: tile: fix build failure