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Revert "ARM: 6944/1: mm: allow ASID 0 to be allocated to tasks" 

This reverts commit 45b95235b0.

Will Deacon reports that:

 In 52af9c6c ("ARM: 6943/1: mm: use TTBR1 instead of reserved context ID")
 I updated the ASID rollover code to use only the kernel page tables
 whilst updating the ASID.

 Unfortunately, the code to restore the user page tables was part of a
 later patch which isn't yet in mainline, so this leaves the code
 quite broken.

We're also in the process of eliminating __ARCH_WANT_INTERRUPTS_ON_CTXSW
from ARM, so lets revert these until we can properly sort out what we're
doing with the context switching.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-06-09 10:12:41 +01:00
parent 07989b7ad6
commit a0a54d37b4
1 changed files with 3 additions and 3 deletions
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6
arch/arm/mm/context.c
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@ -93,7 +93,7 @@ static void reset_context(void *info)
return;
smp_rmb();
asid = cpu_last_asid + cpu;
asid = cpu_last_asid + cpu + 1;
flush_context();
set_mm_context(mm, asid);
@ -143,13 +143,13 @@ void __new_context(struct mm_struct *mm)
* to start a new version and flush the TLB.
*/
if (unlikely((asid & ~ASID_MASK) == 0)) {
asid = cpu_last_asid + smp_processor_id();
asid = cpu_last_asid + smp_processor_id() + 1;
flush_context();
#ifdef CONFIG_SMP
smp_wmb();
smp_call_function(reset_context, NULL, 1);
#endif
cpu_last_asid += NR_CPUS - 1;
cpu_last_asid += NR_CPUS;
}
set_mm_context(mm, asid);