Merge tag 'l3-fix-for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp into x86/urgent

A small L3 cache index disable fix from Srivatsa Bhat which unifies the
way the code checks for already disabled indices.

( Pulling it into v3.4 despite the v3.5 tag - the fix is small and we better
  keep the same code across kernel versions for such user facing interfaces. )

Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 20 insertions, 2 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index b91411371ae1..ebfac782593f 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -523,7 +523,21 @@ int __init arm_add_memory(phys_addr_t start, unsigned long size)
          */
         size -= start & ~PAGE_MASK;
         bank->start = PAGE_ALIGN(start);
-        bank->size  = size & PAGE_MASK;
+
+#ifndef CONFIG_LPAE
+        if (bank->start + size < bank->start) {
+                printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
+                        "32-bit physical address space\n", (long long)start);
+                /*
+                 * To ensure bank->start + bank->size is representable in
+                 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
+                 * This means we lose a page after masking.
+                 */
+                size = ULONG_MAX - bank->start;
+        }
+#endif
+
+        bank->size = size & PAGE_MASK;
 
         /*
          * Check whether this memory region has non-zero size or
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index fef42b21cecb..5b150afb995b 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -118,10 +118,14 @@ static int twd_cpufreq_transition(struct notifier_block *nb,
          * The twd clock events must be reprogrammed to account for the new
          * frequency.  The timer is local to a cpu, so cross-call to the
          * changing cpu.
+         *
+         * Only wait for it to finish, if the cpu is active to avoid
+         * deadlock when cpu1 is spinning on while(!cpu_active(cpu1)) during
+         * booting of that cpu.
          */
         if (state == CPUFREQ_POSTCHANGE || state == CPUFREQ_RESUMECHANGE)
                 smp_call_function_single(freqs->cpu, twd_update_frequency,
-                        NULL, 1);
+                                         NULL, cpu_active(freqs->cpu));
 
         return NOTIFY_OK;
 }