kernel.git/arch/blackfin/kernel/process.c, branch linux-2.6.28.y

Blackfin arch: fix bug - shared lib function in L2 failed be called

2008-10-28T07:57:49Z

Allow user space to access L2 SRAM. Signed-off-by: Jie Zhang Signed-off-by: Bryan Wu

nohz: prevent tick stop outside of the idle loop

2008-07-18T16:10:28Z

Jack Ren and Eric Miao tracked down the following long standing problem in the NOHZ code: scheduler switch to idle task enable interrupts Window starts here ----> interrupt happens (does not set NEED_RESCHED) irq_exit() stops the tick ----> interrupt happens (does set NEED_RESCHED) return from schedule() cpu_idle(): preempt_disable(); Window ends here The interrupts can happen at any point inside the race window. The first interrupt stops the tick, the second one causes the scheduler to rerun and switch away from idle again and we end up with the tick disabled. The fact that it needs two interrupts where the first one does not set NEED_RESCHED and the second one does made the bug obscure and extremly hard to reproduce and analyse. Kudos to Jack and Eric. Solution: Limit the NOHZ functionality to the idle loop to make sure that we can not run into such a situation ever again. cpu_idle() { preempt_disable(); while(1) { tick_nohz_stop_sched_tick(1); <- tell NOHZ code that we are in the idle loop while (!need_resched()) halt(); tick_nohz_restart_sched_tick(); <- disables NOHZ mode preempt_enable_no_resched(); schedule(); preempt_disable(); } } In hindsight we should have done this forever, but ... /me grabs a large brown paperbag. Debugged-by: Jack Ren , Debugged-by: eric miao Signed-off-by: Thomas Gleixner

[Blackfin] arch: fix bug - breaking the atomic sections code.

2008-05-07T03:41:26Z

The following cleanup patch: add __user markings to a few userspace system functions mysteriously added a "&" operator that doesn't belong in there, breaking the atomic sections code. Signed-off-by: Bernd Schmidt Signed-off-by: Bryan Wu

[Blackfin] arch: This allows XIP to work with FD-PIC.

2008-04-23T19:06:15Z

Previously, init failed to do anything meaningful; it turns out that the reason is that FD-PIC has a readonly data section which can be located in the XIP filesystem, and various address checks in the kernel reject such addresses for syscall arguments. Hence, init's execve ("/bin/sh", ...) failed with error code EFAULT. There's room for improvement here: in case people want to have filesystems on flash rather than in main memory, _access_ok should be modified to allow this. This bug fix is also dedicated to Michael Hennerich. Signed-off-by: Bernd Schmidt Signed-off-by: Bryan Wu

[Blackfin] arch: add missing __user marking to ss_sp member of signalstack and a few userspace system functions

2008-03-06T18:37:41Z

Signed-off-by: Mike Frysinger Signed-off-by: Bryan Wu

[Blackfin] arch: initial generic time and clock sources

2008-02-29T04:24:23Z

This patch enables Hight-Res Timers and tickless kernel Signed-off-by: Vitja Makarov Signed-off-by: Michael Hennerich Signed-off-by: Bryan Wu

aout: remove unnecessary inclusions of {asm, linux}/a.out.h

2008-02-08T17:22:30Z

Remove now unnecessary inclusions of {asm,linux}/a.out.h. [akpm@linux-foundation.org: fix alpha build] Signed-off-by: David Howells Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[Blackfin] arch: scrub dead alive/idle LED code

2007-12-24T06:59:03Z

if it does get re-added, it needs to be in the boards directory, not common code ... or it needs a re-implementation Signed-off-by: Mike Frysinger Signed-off-by: Bryan Wu

[Blackfin] arch: Clean up dump_bfin_mem

2007-12-23T14:57:01Z

Clean up dump_bfin_mem so that it will display content from the kernel, as well as l1 instruction, when deferred HW errors happen, print out the last frame info if it makes sense. Signed-off-by: Robin Getz Signed-off-by: Bryan Wu

Blackfin arch: split apart dump_bfin_regs and merge/remove show_regs from process.c, which was largely duplicated

2007-11-21T08:46:49Z

Signed-off-by: Mike Frysinger Signed-off-by: Bryan Wu