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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2015-12-22 08:24:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-15 09:19:09 +0200 |
| commit | 94a4e4e467d7a951fcc45e7b49c74eda3e00c7ea (patch) | |
| tree | c30d5e1f7047a78408784626375b2c1e7b09f7aa /lib/iommu-helper.c | |
| parent | 90757afa09b88dbec2a348037edaf65d4e1ac5c4 (diff) | |
| download | linux-rt-94a4e4e467d7a951fcc45e7b49c74eda3e00c7ea.tar.gz | |
ARM: 8452/3: PJ4: make coprocessor access sequences buildable in Thumb2 mode
commit 5008efc83bf85b647aa1cbc44718b1675bbb7444 upstream.
The PJ4 inline asm sequence to write to cp15 cannot be built in Thumb-2
mode, due to the way it performs arithmetic on the program counter, so it
is built in ARM mode instead. However, building C files in ARM mode under
CONFIG_THUMB2_KERNEL is problematic, since the instrumentation performed
by subsystems like ftrace does not expect having to deal with interworking
branches.
Since the sequence in question is simply a poor man's ISB instruction,
let's use a straight 'isb' instead when building in Thumb2 mode. Thumb2
implies V7, so 'isb' should always be supported in that case.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/iommu-helper.c')
0 files changed, 0 insertions, 0 deletions