MIPS: Avoid dead code/data elimination when using recordmcount

CONFIG_LD_DEAD_CODE_DATA_ELIMINATION builds with -ffunction-sections,
placing every function in its own section. recordmcount refuses to use
weak symbols as section bases, as a strong definition could override
them, so a weak function alone in its section, such as the generic
pcibios_fixup_bus() stub, breaks the build:

  Cannot find symbol for section 88: .text.pcibios_fixup_bus.
  drivers/pci/probe.o: failed

MIPS always records mcount locations with recordmcount, so this hits
any config with the function tracer and dead code elimination enabled,
e.g. malta_defconfig built with LLVM=1.

Only offer dead code elimination when recordmcount is not used, as
powerpc does since commit f8b2336f15f3 ("powerpc: Avoid dead code/data
elimination when using recordmcount"). In practice this makes it
unavailable together with the function tracer on MIPS.

Fixes: c0436b503591 ("MIPS: Enable dead code elimination")
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

0 files changed, 0 insertions, 0 deletions