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| author | James Morse <james.morse@arm.com> | 2016-04-27 17:47:07 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-04-28 12:05:46 +0100 |
| commit | cabe1c81ea5be983425d117912d7883e252a3b09 (patch) | |
| tree | fdaffa85d67177412f944da52ec2443c5d432c6c /arch/arm64/kernel/setup.c | |
| parent | adc9b2dfd00924e9e9b98613f36a6cb8c51f0dc6 (diff) | |
| download | linux-stable-cabe1c81ea5be983425d117912d7883e252a3b09.tar.gz linux-stable-cabe1c81ea5be983425d117912d7883e252a3b09.tar.bz2 linux-stable-cabe1c81ea5be983425d117912d7883e252a3b09.zip | |
arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va
By enabling the MMU early in cpu_resume(), the sleep_save_sp and stack can
be accessed by VA, which avoids the need to convert-addresses and clean to
PoC on the suspend path.
MMU setup is shared with the boot path, meaning the swapper_pg_dir is
restored directly: ttbr1_el1 is no longer saved/restored.
struct sleep_save_sp is removed, replacing it with a single array of
pointers.
cpu_do_{suspend,resume} could be further reduced to not restore: cpacr_el1,
mdscr_el1, tcr_el1, vbar_el1 and sctlr_el1, all of which are set by
__cpu_setup(). However these values all contain res0 bits that may be used
to enable future features.
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/setup.c')
| -rw-r--r-- | arch/arm64/kernel/setup.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 65f515949baa..3279defabaa2 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -176,7 +176,6 @@ static void __init smp_build_mpidr_hash(void) */ if (mpidr_hash_size() > 4 * num_possible_cpus()) pr_warn("Large number of MPIDR hash buckets detected\n"); - __flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash)); } static void __init setup_machine_fdt(phys_addr_t dt_phys) |