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x86: add the "print code before the trapping instruction" feature to 64 bit

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The 32 bit x86 tree has a very useful feature that prints the Code: line
for the code even before the trapping instrution (and the start of the
trapping instruction is then denoted with a <>). Unfortunately, the 64 bit
x86 tree does not yet have this feature, making diagnosing backtraces harder
than needed.

This patch adds this feature in the same was as the 32 bit tree has
(including the same kernel boot parameter), and including a bugfix
to make the code use probe_kernel_address() rarther than a buggy (deadlocking)
__get_user.

Signed-off-by: Arjan van de Ven <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Arjan van de Ven 2008-01-30 13:33:08 +01:00 • committed by Ingo Molnar
commit a25bd94964
2 changed files with 35 additions and 13 deletions
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4
Documentation/kernel-parameters.txt
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@ -416,8 +416,8 @@ and is between 256 and 4096 characters. It is defined in the file
[SPARC64] tick
[X86-64] hpet,tsc
code_bytes [IA32] How many bytes of object code to print in an
oops report.
code_bytes [IA32/X86_64] How many bytes of object code to print
in an oops report.
Range: 0 - 8192
Default: 64