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| author |   Mark Rutland <mark.rutland@arm.com> | 2020-01-16 18:35:48 +0000 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2020-01-17 13:22:14 +0000 |
| commit | 3e3934176a4f9d479dea5cdd2fe6dd560f0ca0cf (patch) | |
| tree | 226179cf9042e53587e0d324c374ed9cbadd7375 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | arm64: entry: cleanup el0 svc handler naming (diff) | |
| download | linux-rng-3e3934176a4f9d479dea5cdd2fe6dd560f0ca0cf.tar.xz linux-rng-3e3934176a4f9d479dea5cdd2fe6dd560f0ca0cf.zip | |
arm64: entry: cleanup sp_el0 manipulation
The kernel stashes the current task struct in sp_el0 so that this can be
acquired consistently/cheaply when required. When we take an exception
from EL0 we have to:
1) stash the original sp_el0 value
2) find the current task
3) update sp_el0 with the current task pointer
Currently steps #1 and #2 occur in one place, and step #3 a while later.
As the value of sp_el0 is immaterial between these points, let's move
them together to make the code clearer and minimize ifdeffery. This
necessitates moving the comment for MDSCR_EL1.SS.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions