forked from luck/tmp_suning_uos_patched
a188ad2bc7
Patch from George G. Davis
Resolve ARM1136 VIPT non-aliasing cache coherency issues observed when
using ptrace to set breakpoints and cleanup copy_{to,from}_user_page()
while we're here as requested by Russell King because "it's also far
too heavy on non-v6 CPUs".
NOTES:
1. Only access_process_vm() calls copy_{to,from}_user_page().
2. access_process_vm() calls get_user_pages() to pin down the "page".
3. get_user_pages() calls flush_dcache_page(page) which ensures cache
coherency between kernel and userspace mappings of "page". However
flush_dcache_page(page) may not invalidate I-Cache over this range
for all cases, specifically, I-Cache is not invalidated for the VIPT
non-aliasing case. So memory is consistent between kernel and user
space mappings of "page" but I-Cache may still be hot over this
range. IOW, we don't have to worry about flush_cache_page() before
memcpy().
4. Now, for the copy_to_user_page() case, after memcpy(), we must flush
the caches so memory is consistent with kernel cache entries and
invalidate the I-Cache if this mm region is executable. We don't
need to do anything after memcpy() for the copy_from_user_page()
case since kernel cache entries will be invalidated via the same
process above if we access "page" again. The flush_ptrace_access()
function (borrowed from SPARC64 implementation) is added to handle
cache flushing after memcpy() for the copy_to_user_page() case.
Signed-off-by: George G. Davis <gdavis@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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| arch-aaec2000 | ||
| arch-at91rm9200 | ||
| arch-cl7500 | ||
| arch-clps711x | ||
| arch-ebsa110 | ||
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| arch-ep93xx | ||
| arch-h720x | ||
| arch-imx | ||
| arch-integrator | ||
| arch-iop3xx | ||
| arch-ixp4xx | ||
| arch-ixp23xx | ||
| arch-ixp2000 | ||
| arch-l7200 | ||
| arch-lh7a40x | ||
| arch-netx | ||
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| arch-pnx4008 | ||
| arch-pxa | ||
| arch-realview | ||
| arch-rpc | ||
| arch-s3c2410 | ||
| arch-sa1100 | ||
| arch-shark | ||
| arch-versatile | ||
| hardware | ||
| mach | ||
| a.out.h | ||
| apm.h | ||
| assembler.h | ||
| atomic.h | ||
| auxvec.h | ||
| bitops.h | ||
| bug.h | ||
| bugs.h | ||
| byteorder.h | ||
| cache.h | ||
| cacheflush.h | ||
| checksum.h | ||
| cpu-multi32.h | ||
| cpu-single.h | ||
| cpu.h | ||
| cputime.h | ||
| current.h | ||
| delay.h | ||
| div64.h | ||
| dma-mapping.h | ||
| dma.h | ||
| domain.h | ||
| dyntick.h | ||
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| elf.h | ||
| emergency-restart.h | ||
| errno.h | ||
| fcntl.h | ||
| fiq.h | ||
| floppy.h | ||
| fpstate.h | ||
| futex.h | ||
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| hardirq.h | ||
| hardware.h | ||
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| ide.h | ||
| io.h | ||
| ioctl.h | ||
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| ipc.h | ||
| ipcbuf.h | ||
| irq.h | ||
| Kbuild | ||
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| leds.h | ||
| limits.h | ||
| linkage.h | ||
| local.h | ||
| locks.h | ||
| mc146818rtc.h | ||
| memory.h | ||
| mman.h | ||
| mmu_context.h | ||
| mmu.h | ||
| mmzone.h | ||
| module.h | ||
| msgbuf.h | ||
| mtd-xip.h | ||
| mutex.h | ||
| namei.h | ||
| nwflash.h | ||
| page-nommu.h | ||
| page.h | ||
| param.h | ||
| parport.h | ||
| pci.h | ||
| percpu.h | ||
| pgalloc.h | ||
| pgtable-hwdef.h | ||
| pgtable-nommu.h | ||
| pgtable.h | ||
| poll.h | ||
| posix_types.h | ||
| proc-fns.h | ||
| processor.h | ||
| procinfo.h | ||
| ptrace.h | ||
| resource.h | ||
| rtc.h | ||
| scatterlist.h | ||
| sections.h | ||
| segment.h | ||
| semaphore-helper.h | ||
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| sembuf.h | ||
| serial.h | ||
| setup.h | ||
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| shmparam.h | ||
| sigcontext.h | ||
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| signal.h | ||
| sizes.h | ||
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| stat.h | ||
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| string.h | ||
| suspend.h | ||
| system.h | ||
| termbits.h | ||
| termios.h | ||
| therm.h | ||
| thread_info.h | ||
| thread_notify.h | ||
| timex.h | ||
| tlb.h | ||
| tlbflush.h | ||
| topology.h | ||
| traps.h | ||
| types.h | ||
| uaccess.h | ||
| ucontext.h | ||
| unaligned.h | ||
| unistd.h | ||
| user.h | ||
| vfp.h | ||
| vfpmacros.h | ||
| vga.h | ||
| xor.h | ||