• David Howells's avatar
    FRV: Fix the section attribute on UP DECLARE_PER_CPU() · 9b8de747
    David Howells authored
    In non-SMP mode, the variable section attribute specified by DECLARE_PER_CPU()
    does not agree with that specified by DEFINE_PER_CPU().  This means that
    architectures that have a small data section references relative to a base
    register may throw up linkage errors due to too great a displacement between
    where the base register points and the per-CPU variable.
    
    On FRV, the .h declaration says that the variable is in the .sdata section, but
    the .c definition says it's actually in the .data section.  The linker throws
    up the following errors:
    
    kernel/built-in.o: In function `release_task':
    kernel/exit.c:78: relocation truncated to fit: R_FRV_GPREL12 against symbol `per_cpu__process_counts' defined in .data section in kernel/built-in.o
    kernel/exit.c:78: relocation truncated to fit: R_FRV_GPREL12 against symbol `per_cpu__process_counts' defined in .data section in kernel/built-in.o
    
    To fix this, DECLARE_PER_CPU() should simply apply the same section attribute
    as does DEFINE_PER_CPU().  However, this is made slightly more complex by
    virtue of the fact that there are several variants on DEFINE, so these need to
    be matched by variants on DECLARE.
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    9b8de747
desc.h 10.2 KB