Blackfin: rewrite resync_core_{i,d}cache() SMP logic to avoid per_cpu data

This functions are implicitly called by core functions like cpu_relax(),
and since those functions may be called early on before common code has
initialized the per-cpu data area, we need to tweak the stats gathering.
Now the statistics are maintained in common bss which makes these funcs
safe to use as soon as the C runtime env is setup.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

4 files changed, 13 insertions, 6 deletions

diff --git a/arch/blackfin/include/asm/cpu.h b/arch/blackfin/include/asm/cpu.h
index b191dc662bd..16883e582e3 100644
--- a/arch/blackfin/include/asm/cpu.h
+++ b/arch/blackfin/include/asm/cpu.h
@@ -17,8 +17,6 @@ struct blackfin_cpudata {
         struct task_struct *idle;
         unsigned int imemctl;
         unsigned int dmemctl;
-        unsigned long dcache_invld_count;
-        unsigned long icache_invld_count;
 };
 
 DECLARE_PER_CPU(struct blackfin_cpudata, cpu_data);
diff --git a/arch/blackfin/include/asm/smp.h b/arch/blackfin/include/asm/smp.h
index 7f26de09ca9..f5b53796711 100644
--- a/arch/blackfin/include/asm/smp.h
+++ b/arch/blackfin/include/asm/smp.h
@@ -24,6 +24,13 @@ struct corelock_slot {
 };
 extern struct corelock_slot corelock;
 
+#ifdef __ARCH_SYNC_CORE_ICACHE
+extern unsigned long icache_invld_count[NR_CPUS];
+#endif
+#ifdef __ARCH_SYNC_CORE_DCACHE
+extern unsigned long dcache_invld_count[NR_CPUS];
+#endif
+
 void smp_icache_flush_range_others(unsigned long start,
                                    unsigned long end);
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index b54ba45db5f..8e2efceb364 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -1239,10 +1239,10 @@ static int show_cpuinfo(struct seq_file *m, void *v)
                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
                    BFIN_DLINES);
 #ifdef __ARCH_SYNC_CORE_DCACHE
-        seq_printf(m, "SMP Dcache Flushes\t: %lu\n\n", cpudata->dcache_invld_count);
+        seq_printf(m, "SMP Dcache Flushes\t: %lu\n\n", dcache_invld_count[cpu_num]);
 #endif
 #ifdef __ARCH_SYNC_CORE_ICACHE
-        seq_printf(m, "SMP Icache Flushes\t: %lu\n\n", cpudata->icache_invld_count);
+        seq_printf(m, "SMP Icache Flushes\t: %lu\n\n", icache_invld_count[cpu_num]);
 #endif
 
         if (cpu_num != num_possible_cpus() - 1)
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index efc47ffd066..7803f22d2ca 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -474,24 +474,26 @@ void smp_icache_flush_range_others(unsigned long start, unsigned long end)
 EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);
 
 #ifdef __ARCH_SYNC_CORE_ICACHE
+unsigned long icache_invld_count[NR_CPUS];
 void resync_core_icache(void)
 {
         unsigned int cpu = get_cpu();
         blackfin_invalidate_entire_icache();
-        ++per_cpu(cpu_data, cpu).icache_invld_count;
+        icache_invld_count[cpu]++;
         put_cpu();
 }
 EXPORT_SYMBOL(resync_core_icache);
 #endif
 
 #ifdef __ARCH_SYNC_CORE_DCACHE
+unsigned long dcache_invld_count[NR_CPUS];
 unsigned long barrier_mask __attribute__ ((__section__(".l2.bss")));
 
 void resync_core_dcache(void)
 {
         unsigned int cpu = get_cpu();
         blackfin_invalidate_entire_dcache();
-        ++per_cpu(cpu_data, cpu).dcache_invld_count;
+        dcache_invld_count[cpu]++;
         put_cpu();
 }
 EXPORT_SYMBOL(resync_core_dcache);