x86/vdso: Move DISABLE_BRANCH_PROFILING into the vdso makefile

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DISABLE_BRANCH_PROFILING turns off branch profiling (i.e. a
redefinition of 'if').  Branch profiling depends on a bunch of
kernel-internal symbols and generates extra output sections, none of
which are useful or functional in the vDSO.

It's currently turned off for vclock_gettime.c, but vgetcpu.c also
triggers branch profiling, so just turn it off in the makefile.

This fixes the build on some configurations: the vdso could contain
undefined symbols, and the fake section table overflowed due to
ftrace's added sections.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/bf1ec29e03b2bbc081f6dcaefa64db1c3a83fb21.1403642755.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Andy Lutomirski 2014-06-24 13:46:52 -07:00 • committed by H. Peter Anvin

parent 6ba19a670c

commit 46b57a7693

2 changed files with 3 additions and 4 deletions

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4

arch/x86/vdso/Makefile

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3

arch/x86/vdso/vclock_gettime.c

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