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| author | James Morse <james.morse@arm.com> | 2016-10-18 11:27:48 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-10-20 09:50:54 +0100 |
| commit | d08544127d9fb4505635e3cb6871fd50a42947bd (patch) | |
| tree | 2b160164a9befa78939dbbabb61259d02713d3c4 /arch/arm64/kernel/process.c | |
| parent | 7209c868600bd8926e37c10b9aae83124ccc1dd8 (diff) | |
| download | linux-stable-d08544127d9fb4505635e3cb6871fd50a42947bd.tar.gz linux-stable-d08544127d9fb4505635e3cb6871fd50a42947bd.tar.bz2 linux-stable-d08544127d9fb4505635e3cb6871fd50a42947bd.zip | |
arm64: suspend: Reconfigure PSTATE after resume from idle
The suspend/resume path in kernel/sleep.S, as used by cpu-idle, does not
save/restore PSTATE. As a result of this cpufeatures that were detected
and have bits in PSTATE get lost when we resume from idle.
UAO gets set appropriately on the next context switch. PAN will be
re-enabled next time we return from user-space, but on a preemptible
kernel we may run work accessing user space before this point.
Add code to re-enable theses two features in __cpu_suspend_exit().
We re-use uao_thread_switch() passing current.
Signed-off-by: James Morse <james.morse@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/process.c')
| -rw-r--r-- | arch/arm64/kernel/process.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 27b2f1387df4..4f186c56c5eb 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -49,6 +49,7 @@ #include <asm/alternative.h> #include <asm/compat.h> #include <asm/cacheflush.h> +#include <asm/exec.h> #include <asm/fpsimd.h> #include <asm/mmu_context.h> #include <asm/processor.h> @@ -301,7 +302,7 @@ static void tls_thread_switch(struct task_struct *next) } /* Restore the UAO state depending on next's addr_limit */ -static void uao_thread_switch(struct task_struct *next) +void uao_thread_switch(struct task_struct *next) { if (IS_ENABLED(CONFIG_ARM64_UAO)) { if (task_thread_info(next)->addr_limit == KERNEL_DS) |