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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-06-09 10:12:41 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-06-09 10:13:16 +0100
commita0a54d37b4b1d1f55d1e81e8ffc223bb85472fa3 (patch)
tree3a3340b42833020a7f25d7ebe015d2d831f0c228 /arch/arm/mm/context.c
parent07989b7ad63af424886ff922fd3bcca9e00ffa78 (diff)
Revert "ARM: 6944/1: mm: allow ASID 0 to be allocated to tasks"
This reverts commit 45b95235b0ac86cef2ad4480b0618b8778847479. 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>
Diffstat (limited to 'arch/arm/mm/context.c')
-rw-r--r--arch/arm/mm/context.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
index b6c776ae403..b0ee9ba3cfa 100644
--- a/arch/arm/mm/context.c
+++ b/arch/arm/mm/context.c
@@ -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);