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Fix ptrace software breakpoints

Will Deacon linux-arm-kernel 1 version New

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  1. v1 Latest0 of 2 patches 0 repliesNew

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Cover letter [PATCH 0/2] Fix ptrace software breakpoints

Hi Rob,

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Will Deacon (2):
ARM: errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a
faulty ASID
ARM: flush_ptrace_access: invalidate all I-caches

  arch/arm/Kconfig                |   12 ++++++++++++
  arch/arm/include/asm/tlbflush.h |    8 ++++++++
  arch/arm/mm/flush.c             |    4 ++--
  3 files changed, 22 insertions(+), 2 deletions(-)
Quoted 8 lines

Tested on omap4430 (cortex-a9 SMP).. with this patchset I have yet to see it fail, in regular use nor in the test case I wrote to show the problem (git://github.com/robclark/gdb-test.git). Without these patches, I'd see SIGILL and missed breakpoints 90+% of the time in regular use of gdb (basically gdb was unusable unless I booted with nosmp or disabled cache), and 100% of the time in my gdb-test.

Tested-by Rob Clark<[email protected]>

Thanks for testing this. I've seen the same results on my Versatile Express board running Ubuntu Lucid.

Russell - can I submit these to the patch system please or do you have any outstanding concerns?

Cheers,

Will

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