linux-toradex.git/arch/mips/kernel/unaligned.c, branch v3.12.29

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

2014-09-17T14:55:07+00:00

commit 2e5767a27337812f6850b3fa362419e2f085e5c3 upstream.

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: John Crispin 
Cc: Steven J. Hill 
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang 
Cc: Zhangjin Wu 
Signed-off-by: Ralf Baechle 
Signed-off-by: Jiri Slaby

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

Disintegrate asm/system.h for MIPS

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for MIPS.

Signed-off-by: David Howells 
Acked-by: Ralf Baechle 
cc: linux-mips@linux-mips.org

mips: remove needless include of module.h from core kernel files.

2011-10-31T23:30:57+00:00

None of these files are using modular infrastructure, and build
tests reveal that none of these files are really relying on any
implicit inclusions via. module.h either.  So delete them.

Signed-off-by: Paul Gortmaker