linux/arch/openrisc/kernel, branch v3.4.10

Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

2012-03-28T22:58:21Z

Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...

Disintegrate asm/system.h for OpenRISC

2012-03-28T17:30:03Z

Disintegrate asm/system.h for OpenRISC. Not compiled. Signed-off-by: David Howells Acked-by: Arnd Bergmann cc: linux@lists.openrisc.net

openrisc: sanitize use of orig_gpr11

2012-03-06T09:37:00Z

The pt_regs struct had both a 'syscallno' field and an 'orig_gpr11' field and it wasn't really clear how these were supposed to be used. This patch removes the syscallno field altogether and makes orig_gpr11 work more like other architectures: keep track of syscall number in progress or hold -1 for non-syscall exceptions. Signed-off-by: Jonas Bonn

OpenRISC: Export dump_stack()

2012-03-06T09:36:02Z

dump_stack() is used by modules and needs to be exported. Signed-off-by: Richard Weinberger Signed-off-by: Jonas Bonn

openrisc: Set shortest clock event to 100 ticks

2012-02-17T09:08:19Z

It takes a couple of instructions to actually configure a clock event so setting an alarm just 1 clock cycle in the future isn't going to work; doing so results in setting an alarm in the "past" in which case the event won't fire until the timer overflows and rolls back around to the "current time". Not quite sure how many clock cycles it actually takes to get through to actually writing the register, but 100 seems to work reliably. Use generic helper to set up the clock event while we're at it. Reported-by: Jan Schulte Signed-off-by: Jonas Bonn

OpenRISC: Use set_current_blocked() and block_sigmask()

2012-02-17T08:55:25Z

As described in e6fa16ab ("signal: sigprocmask() should do retarget_shared_pending()") the modification of current->blocked is incorrect as we need to check whether the signal we're about to block is pending in the shared queue. Also, use the new helper function introduced in commit 5e6292c0f28f ("signal: add block_sigmask() for adding sigmask to current->blocked") which centralises the code for updating current->blocked after successfully delivering a signal and reduces the amount of duplicate code across architectures. In the past some architectures got this code wrong, so using this helper function should stop that from happening again. Cc: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn

OpenRISC: Don't mask signals if we fail to setup signal stack

2012-02-17T08:55:24Z

setup_rt_frame() needs to return an indication of whether it succeeded or failed in setting up the signal stack frame. If setup_rt_frame() fails then we must not modify current->blocked. Acked-by: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn

OpenRISC: No need to reset handler if SA_ONESHOT

2012-02-17T08:55:23Z

get_signal_to_deliver() already resets the signal handler if SA_ONESHOT is set in ka->sa.sa_flags, there's no need to do it again in handle_signal(). Furthermore, because we were modifying ka->sa.sa_handler (which is a copy of sighand->action[]) instead of sighand->action[] the original code actually had no effect on signal delivery. Acked-by: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn

OpenRISC: Don't reimplement force_sigsegv()

2012-02-17T08:55:23Z

Instead of open coding the sequence from force_sigsegv() just call it. This also fixes a bug because we were modifying ka->sa.sa_handler (which is a copy of sighand->action[]), whereas the intention of the code was to modify sighand->action[] directly. As the original code was working with a copy it had no effect on signal delivery. Acked-by: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn

openrisc: enable passing of flattened device tree pointer

2012-02-17T08:55:22Z

This patch enables passing a fdt pointer to the kernel. This makes for the kernel parameter API: void kernel(unsigned int fdt); which, in accordance with the OpenRISC ABI results in: r3 = pointer to fdt Signed-off-by: Stefan Kristiansson Signed-off-by: Jonas Bonn