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objtool, compiler.h: Fix __unreachable section relocation size 

Linus reported the following commit broke module loading on his laptop:

  d1091c7fa3 ("objtool: Improve detection of BUG() and other dead ends")

It showed errors like the following:

  module: overflow in relocation type 10 val ffffffffc02afc81
  module: 'nvme' likely not compiled with -mcmodel=kernel

The problem is that the __unreachable section addresses are stored using
the '.long' asm directive, which isn't big enough for .text section
kernel addresses.  Use relative addresses instead:

  ".long %c0b - .\t\n"

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/20170301060504.oltm3iws6fmubnom@treble
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2017-03-01 00:05:04 -06:00 committed by Ingo Molnar
parent 2d6be4abf5
commit 55149d0653
1 changed files with 1 additions and 1 deletions
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2
include/linux/compiler-gcc.h
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@ -201,7 +201,7 @@
#define annotate_unreachable() ({ \
asm("%c0:\t\n" \
".pushsection __unreachable, \"a\"\t\n" \
".long %c0b\t\n" \
".long %c0b - .\t\n" \
".popsection\t\n" : : "i" (__LINE__)); \
})
#else