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| author |   Will Deacon <will.deacon@arm.com> | 2014-09-29 11:44:01 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-11-14 10:42:15 +0000 |
| commit | d54e81f9af1d106e47ae8594903c43a80dae1a99 (patch) | |
| tree | e3084f896a27a4658a718643a589169c51f0aa27 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | arm64: Fix up /proc/cpuinfo (diff) | |
| download | linux-dev-d54e81f9af1d106e47ae8594903c43a80dae1a99.tar.xz linux-dev-d54e81f9af1d106e47ae8594903c43a80dae1a99.zip | |
arm64: entry: avoid writing lr explicitly for constructing return paths
Using an explicit adr instruction to set the link register to point at
ret_fast_syscall/ret_to_user can defeat branch and return stack predictors.
Instead, use the standard calling instructions (bl, blr) and have an
unconditional branch as the following instruction.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions