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arm64: Do not attempt to use init_mm in reset_context()

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commit 565630d503ef24e44c252bed55571b3a0d68455f upstream.

After secondary CPU boot or hotplug, the active_mm of the idle thread is
&init_mm. The init_mm.pgd (swapper_pg_dir) is only meant for TTBR1_EL1
and must not be set in TTBR0_EL1. Since when active_mm == &init_mm the
TTBR0_EL1 is already set to the reserved value, there is no need to
perform any context reset.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Catalin Marinas 2015-06-12 11:24:41 +01:00 committed by Greg Kroah-Hartman
parent ea207ff62f
commit 2b97cbc8c4
1 changed files with 8 additions and 0 deletions
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8
arch/arm64/mm/context.c
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@ -92,6 +92,14 @@ static void reset_context(void *info)
unsigned int cpu = smp_processor_id();
struct mm_struct *mm = current->active_mm;
/*
* current->active_mm could be init_mm for the idle thread immediately
* after secondary CPU boot or hotplug. TTBR0_EL1 is already set to
* the reserved value, so no need to reset any context.
*/
if (mm == &init_mm)
return;
smp_rmb();
asid = cpu_last_asid + cpu;