From 718340f62900ed44046d2b0f74d0dec7cf844194 Mon Sep 17 00:00:00 2001 From: Graf Yang Date: Mon, 1 Feb 2010 06:07:50 +0000 Subject: [PATCH] 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 Signed-off-by: Mike Frysinger --- arch/blackfin/include/asm/cpu.h | 2 -- arch/blackfin/include/asm/smp.h | 7 +++++++ arch/blackfin/kernel/setup.c | 4 ++-- arch/blackfin/mach-common/smp.c | 6 ++++-- 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); -- 2.20.1