linux.git/arch/mips/kernel/unaligned.c, branch v3.17

MIPS: Remove BUG_ON(!is_fpu_owner()) in do_ade()

2014-07-30T19:30:22+00:00

In do_ade(), is_fpu_owner() isn't preempt-safe. For example, when an
unaligned ldc1 is executed, do_cpu() is called and then FPU will be
enabled (and TIF_USEDFPU will be set for the current process). Then,
do_ade() is called because the access is unaligned.  If the current
process is preempted at this time, TIF_USEDFPU will be cleard.  So when
the process is scheduled again, BUG_ON(!is_fpu_owner()) is triggered.

This small program can trigger this BUG in a preemptible kernel:

int main (int argc, char *argv[])
{
        double u64[2];

        while (1) {
                asm volatile (
                        ".set push \n\t"
                        ".set noreorder \n\t"
                        "ldc1 $f3, 4(%0) \n\t"
                        ".set pop \n\t"
                        ::"r"(u64):
                );
        }

        return 0;
}

V2: Remove the BUG_ON() unconditionally due to Paul's suggestion.

Signed-off-by: Huacai Chen 
Signed-off-by: Jie Chen 
Signed-off-by: Rui Wang 
Cc: 
Cc: John Crispin 
Cc: Steven J. Hill 
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang 
Cc: Zhangjin Wu 
Cc: stable@vger.kernel.org
Signed-off-by: Ralf Baechle

MIPS: kernel: unaligned: Handle unaligned accesses for EVA

2014-03-26T22:09:16+00:00

Handle unaligned accesses when we access userspace memory
EVA mode.

Signed-off-by: Leonid Yegoshin 
Signed-off-by: Markos Chandras

MIPS: kernel: unaligned: Add EVA instruction wrappers

2014-03-26T22:09:16+00:00

Use the load/store instruction wrappers from asm/asm.h to
perform such operations when operating in EVA mode.

Signed-off-by: Markos Chandras

MIPS: Declare emulate_load_store_microMIPS as a static function.

2013-07-01T13:10:57+00:00

It is only used from within a single file, it should not be globally
visible.

Signed-off-by: David Daney 
Acked-by: Steven J. Hill 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5325/
Signed-off-by: Ralf Baechle

MIPS: Cleanup indentation and whitespace

2013-07-01T13:10:57+00:00

Signed-off-by: Tony Wu 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5536/
Signed-off-by: Ralf Baechle

MIPS: Implement HAVE_CONTEXT_TRACKING.

2013-06-10T16:02:30+00:00

This enables support for CONFIG_NO_HZ_FULL.

Signed-off-by: Ralf Baechle

MIPS: MIPS16e: Add unaligned access support.

2013-05-09T15:55:20+00:00

Add logic needed to handle unaligned accesses in MIPS16e mode.

Signed-off-by: Steven J. Hill 
Signed-off-by: Leonid Yegoshin

MIPS: microMIPS: Add unaligned access support.

2013-05-09T15:55:19+00:00

Add logic needed to handle unaligned accesses in microMIPS mode.

Signed-off-by: Steven J. Hill 
Signed-off-by: Leonid Yegoshin

MIPS: microMIPS: Floating point support.

2013-05-09T15:55:18+00:00

Add logic needed to do floating point emulation in microMIPS mode.

Signed-off-by: Leonid Yegoshin 
Signed-off-by: Steven J. Hill

MIPS: Whitespace cleanup.

2013-02-01T09:00:22+00:00

Having received another series of whitespace patches I decided to do this
once and for all rather than dealing with this kind of patches trickling
in forever.

Signed-off-by: Ralf Baechle