x86, relocs: Workaround for binutils 2.22.52.0.1 section bug

GNU ld 2.22.52.0.1 has a bug that it blindly changes symbols from
section-relative to absolute if they are in a section of zero length.
This turns the symbols __init_begin and __init_end into absolute
symbols.  Let the relocs program know that those should be treated as
relative symbols.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: H.J. Lu <hjl.tools@gmail.com>
Cc: <stable@vger.kernel.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@intel.com>

diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index 0291470..c3cfbb2 100644 (file)
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -56,7 +56,11 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = {
  * as absolute (typically defined outside any section in the linker script.)
  */
        [S_REL] =
-       "^_end$",
+       "^(__init_(begin|end)|"
+       "__x86_cpu_dev_(start|end)|"
+       "(__parainstructions|__alt_instructions)(|_end)|"
+       "(__iommu_table|__apicdrivers|__smp_locks)(|_end)|"
+       "_end)$"
 };