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authorGraf Yang <graf.yang@analog.com>2010-02-01 06:07:50 +0000
committerMike Frysinger <vapier@gentoo.org>2010-03-09 00:30:50 -0500
commit718340f62900ed44046d2b0f74d0dec7cf844194 (patch)
tree974cf52038196598c653902de3da83ca96ee3792
parent6c2b7072a7035837998da38809f98e4182e4c41c (diff)
downloadtalos-op-linux-718340f62900ed44046d2b0f74d0dec7cf844194.tar.gz
talos-op-linux-718340f62900ed44046d2b0f74d0dec7cf844194.zip
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>
-rw-r--r--arch/blackfin/include/asm/cpu.h2
-rw-r--r--arch/blackfin/include/asm/smp.h7
-rw-r--r--arch/blackfin/kernel/setup.c4
-rw-r--r--arch/blackfin/mach-common/smp.c6
4 files changed, 13 insertions, 6 deletions
diff --git a/arch/blackfin/include/asm/cpu.h b/arch/blackfin/include/asm/cpu.h
index b191dc662bd8..16883e582e3c 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 7f26de09ca9c..f5b537967116 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 b54ba45db5f1..8e2efceb364b 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 efc47ffd066d..7803f22d2ca7 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);
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