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arm64: Remove the get_thread_info() function

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This function was introduced by previous commits implementing UAO.
However, it can be replaced with task_thread_info() in
uao_thread_switch() or get_fs() in do_page_fault() (the latter being
called only on the current context, so no need for using the saved
pt_regs).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas
2016-02-18 15:50:04 +00:00
parent 7054419600
commit e950631e84
3 changed files with 7 additions and 16 deletions
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15
arch/arm64/kernel/process.c
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@@ -315,15 +315,12 @@ 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)
{
unsigned long next_sp = next->thread.cpu_context.sp;
if (IS_ENABLED(CONFIG_ARM64_UAO) &&
get_thread_info(next_sp)->addr_limit == KERNEL_DS)
asm(ALTERNATIVE("nop", SET_PSTATE_UAO(1), ARM64_HAS_UAO,
CONFIG_ARM64_UAO));
else
asm(ALTERNATIVE("nop", SET_PSTATE_UAO(0), ARM64_HAS_UAO,
CONFIG_ARM64_UAO));
if (IS_ENABLED(CONFIG_ARM64_UAO)) {
if (task_thread_info(next)->addr_limit == KERNEL_DS)
asm(ALTERNATIVE("nop", SET_PSTATE_UAO(1), ARM64_HAS_UAO));
else
asm(ALTERNATIVE("nop", SET_PSTATE_UAO(0), ARM64_HAS_UAO));
}
}
/*