summaryrefslogtreecommitdiffstats
path: root/kernel/kprobes.c
diff options
context:
space:
mode:
authorChristoph Lameter <cl@linux.com>2010-12-06 11:16:24 -0600
committerTejun Heo <tj@kernel.org>2010-12-17 15:07:18 +0100
commit4a6f4fe8377720e5a279fdbb769946c242e936d3 (patch)
tree9684b9d39fe8b3aa620465ca0a51e4aacbfdd633 /kernel/kprobes.c
parent12938a9220a38d555e38dc9b40021e664b99a1f1 (diff)
downloadop-kernel-dev-4a6f4fe8377720e5a279fdbb769946c242e936d3.zip
op-kernel-dev-4a6f4fe8377720e5a279fdbb769946c242e936d3.tar.gz
drivers: Replace __get_cpu_var with __this_cpu_read if not used for an address.
__get_cpu_var() can be replaced with this_cpu_read and will then use a single read instruction with implied address calculation to access the correct per cpu instance. However, the address of a per cpu variable passed to __this_cpu_read() cannot be determed (since its an implied address conversion through segment prefixes). Therefore apply this only to uses of __get_cpu_var where the addres of the variable is not used. V3->V4: - Move one instance of this_cpu_inc_return to a later patch so that this one can go in without percpu infrastructrure changes. Sedat: fixed compile failure caused by an extra ')'. Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Sedat Dilek <sedat.dilek@gmail.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/kprobes.c')
0 files changed, 0 insertions, 0 deletions
OpenPOWER on IntegriCloud