kernel/git/stable/linux.git/arch/powerpc, branch linux-2.6.21.y

POWERPC: Fix subtle FP state corruption bug in signal return on SMP

2007-08-04T16:10:25+00:00

This fixes a bug which can cause corruption of the floating-point state on return from a signal handler. If we have a signal handler that has used the floating-point registers, and it happens to context-switch to another task while copying the interrupted floating-point state from the user stack into the thread struct (e.g. because of a page fault, or because it gets preempted), the context switch code will think that the FP registers contain valid FP state that needs to be copied into the thread_struct, and will thus overwrite the values that the signal return code has put into the thread_struct. This can occur because we clear the MSR bits that indicate the presence of valid FP state after copying the state into the thread_struct. To fix this we just move the clearing of the MSR bits to before the copy. A similar potential problem also occurs with the Altivec state, and this fixes that in the same way. Signed-off-by: Paul Mackerras Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman

[POWERPC] mpc52xx_pic: fix main interrupt masking

2007-04-11T16:39:58+00:00

The bit setting was off by one. Tested with RTC and GPIO_WKUP interrupts. Signed-off-by: Domen Puncer Signed-off-by: Sylvain Munaut Signed-off-by: Paul Mackerras

[POWERPC] qe: Fix QUICC Engine SDMA setup errors

2007-03-29T19:33:42+00:00

Correct the alignment of the internal buffer used by the QUICC Engine SDMA controller to 4Kbytes. Correct the shift direction in the logic that sets up the SDMR register for the QUICC Engine SDMA controller. Signed-off-by: Chuck Meade Signed-off-by: Kumar Gala

[POWERPC] Fix dcr_unmap()

2007-03-28T23:49:23+00:00

Fix a bug in dcr_unmap(). At unmap time the DCR offset need to be added instead of substracted. Signed-off-by: Jean-Christophe Dubois Acked-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras

[POWERPC] Bypass hcall stats until cpu features have run

2007-03-22T04:01:43+00:00

I noticed that we execute hcalls before cpu feature code has run (eg for setting up the bolted kernel region). This means that we may be executing code that is not appropriate for the processor we have. Create an unconditional branch that we nop out all the time to fix this. Signed-off-by: Anton Blanchard Signed-off-by: Paul Mackerras

[POWERPC] Avoid hypervisor statistics calculation in real mode

2007-03-22T04:01:43+00:00

kexec invokes plpar_hcall hypervisor call in real mode. plpar_hcall refers to per cpu variables for accounting hypervisor statistics. These variables may not be in the RMO region, so accesses to them in real mode may result in a data storage exception. This fixes this problem by using a new plpar_hcall_raw function which does not update the hypervisor call statistics. Thanks to Anton for suggesting this idea. Signed-off-by: Mohan Kumar M Signed-off-by: Paul Mackerras

[POWERPC] Fix atomicity of TIF update in flush_thread()

2007-03-16T05:37:28+00:00

Fix atomicity of TIF update in flush_thread() for powerpc Fixes it correctly with *_ti_thread_flag. Race : parent process executing : sys_ptrace() (lock_kernel()) (ptrace_get_task_struct(pid)) arch_ptrace() ptrace_detach() ptrace_disable(child); clear_singlestep(child); clear_tsk_thread_flag(child, TIF_SINGLESTEP); (which clears the TIF_SINGLESTEP flag atomically from a different process) (put_task_struct(child)) (unlock_kernel()) And at the same time, in the child process : sys_execve() do_execve() search_binary_handler() load_elf_binary() flush_old_exec() flush_thread() doing a non-atomic thread flag update Applies on 2.6.20. Signed-off-by: Mathieu Desnoyers Signed-off-by: Paul Mackerras

[PATCH] pasemi trivial iomem annotations

2007-03-14T22:27:50+00:00

Signed-off-by: Al Viro Acked-by: Olof Johansson Signed-off-by: Linus Torvalds

[PATCH] constant should be long

2007-03-14T22:27:50+00:00

Signed-off-by: Al Viro Acked-by: Olof Johansson Signed-off-by: Linus Torvalds

[POWERPC] update cell_defconfig

2007-03-09T23:07:52+00:00

Signed-off-by: Arnd Bergmann