linux/arch/arc/mm
Vineet Gupta 2328af0c9c ARC: [SMP] Enable icache coherency
icaches are not snooped hence not cohrent in SMP setups which means
kernel has to do cross core calls to ensure the same.

The leaf routine __ic_line_inv_vaddr() now does cross core calls.

__sync_icache_dcache() is affected due to this:

* local dcache line flushed ahead of remote icache inv requests
* can't disable interrupts anymore, since
      __ic_line_inv_vaddr()->on_each_cpu() can deadlock.

| WARNING: CPU: 0 PID: 1 at kernel/smp.c:374
| smp_call_function_many+0x25a/0x2c4()
|
|  init_kprobes+0x90/0xc8
|     register_kprobe+0x1d6/0x510
|	__sync_icache_dcache+0x28/0x80
|
|	    DISABLE IRQ
|
|	    __ic_line_inv_vaddr
|		on_each_cpu
|		     smp_call_function_many+0x25a/0x2c4   --> WARN
|			__ic_line_inv_vaddr_local
|	    __dc_line_op

* TODO: Needs to use mask of relevant CPUs to avoid broadcasting

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26 11:59:01 +05:30
..
cache_arc700.c ARC: [SMP] Enable icache coherency 2014-06-26 11:59:01 +05:30
dma.c
extable.c
fault.c ARC: Change calling convention of do_page_fault() 2013-11-06 10:41:39 +05:30
init.c ARC: support external initrd 2014-03-26 14:31:27 +05:30
ioremap.c
Makefile ARC: [mm] Aliasing VIPT dcache support 4/4 2013-05-09 22:00:57 +05:30
mmap.c ARC: [mm] Aliasing VIPT dcache support 4/4 2013-05-09 22:00:57 +05:30
tlb.c ARC: [SMP] TLB flush 2013-11-06 10:41:45 +05:30
tlbex.S ARC: switch to generic ENTRY/END assembler annotations 2014-03-26 14:31:28 +05:30