ARM: Fix kgdb breakpoint for Thumb2
The kgdb code needs to register an undef hook for the Thumb UDF instruction that will fault in order to be functional on Thumb2 platforms. Reported-by: Johannes Stezenbach <js@sig21.net> Tested-by: Johannes Stezenbach <js@sig21.net> Fixes: 5cbad0eb ("kgdb: support for ARCH=arm") Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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