[PATCH] i386: Retrieve CLFLUSH size from CPUID

Also report it in /proc/cpuinfo similar to x86-64.

Needed for followon patch

Signed-off-by: Andi Kleen <ak@suse.de>

3 files changed, 6 insertions, 1 deletions

diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 6958ae5e2fa5..cda41aef79ad 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -309,6 +309,8 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 * c)
 #else
                         c->apicid = (ebx >> 24) & 0xFF;
 #endif
+                        if (c->x86_capability[0] & (1<<19))
+                                c->x86_clflush_size = ((ebx >> 8) & 0xff) * 8;
                 } else {
                         /* Have CPUID level 0 only - unheard of */
                         c->x86 = 4;
@@ -373,6 +375,7 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
         c->x86_vendor_id[0] = '\0'; /* Unset */
         c->x86_model_id[0] = '\0';  /* Unset */
         c->x86_max_cores = 1;
+        c->x86_clflush_size = 32;
         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 
         if (!have_cpuid_p()) {
diff --git a/arch/i386/kernel/cpu/proc.c b/arch/i386/kernel/cpu/proc.c
index 76aac088a323..6624d8583c42 100644
--- a/arch/i386/kernel/cpu/proc.c
+++ b/arch/i386/kernel/cpu/proc.c
@@ -152,9 +152,10 @@ static int show_cpuinfo(struct seq_file *m, void *v)
                                 seq_printf(m, " [%d]", i);
                 }
 
-        seq_printf(m, "\nbogomips\t: %lu.%02lu\n\n",
+        seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
                      c->loops_per_jiffy/(500000/HZ),
                      (c->loops_per_jiffy/(5000/HZ)) % 100);
+        seq_printf(m, "clflush size\t: %u\n\n", c->x86_clflush_size);
 
         return 0;
 }
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index f73cf836e649..98fa73b71760 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -72,6 +72,7 @@ struct cpuinfo_x86 {
 #endif
         unsigned char x86_max_cores;    /* cpuid returned max cores value */
         unsigned char apicid;
+        unsigned short x86_clflush_size;
 #ifdef CONFIG_SMP
         unsigned char booted_cores;     /* number of cores as seen by OS */
         __u8 phys_proc_id;              /* Physical processor id. */