perf bpf: Add BPF_PROLOGUE config options for further patches
authorWang Nan <wangnan0@huawei.com>
Mon, 16 Nov 2015 12:10:10 +0000 (12:10 +0000)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Wed, 18 Nov 2015 20:51:03 +0000 (17:51 -0300)
commit1c0ed63239012aa881cc811f726b549dca7279e4
tree3421c66967a9a7ed3c447df151145b319e8dc326
parentb580563e38487d9db8e94080149644da71c533c1
perf bpf: Add BPF_PROLOGUE config options for further patches

If both LIBBPF and DWARF are detected, it is possible to create prologue
for eBPF programs to help them access kernel data. HAVE_BPF_PROLOGUE and
CONFIG_BPF_PROLOGUE are added as flags for this feature.

PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET is introduced in commit
63ab024a5b6f295ca17a293ad81b7c728f49a89a ("perf tools:
regs_query_register_offset() infrastructure"), which indicates that an
architecture supports converting name of a register to its offset in
'struct pt_regs'. Without this support, BPF_PROLOGUE should be turned
off.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1447675815-166222-9-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/config/Makefile