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kbuild: linker script do not match C names unless LD_DEAD_CODE_DATA_E…
…LIMINATION is configured The .data and .bss sections were modified in the generic linker script to pull in sections named .data.<C identifier>, which are generated by gcc with -ffunction-sections and -fdata-sections options. The problem with this pattern is it can also match section names that Linux defines explicitly, e.g., .data.unlikely. This can cause Linux sections to get moved into the wrong place. The way to avoid this is to use ".." separators for explicit section names (the dot character is valid in a section name but not a C identifier). However currently there are sections which don't follow this rule, so for now just disable the wild card by default. Example: http://marc.info/?l=linux-arm-kernel&m=150106824024221&w=2 Cc: <[email protected]> # 4.9 Fixes: b67067f ("kbuild: allow archs to select link dead code/data elimination") Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
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