Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6

[pandora-kernel.git] / arch / x86_64 / kernel / setup.c

diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index fc944b5..af425a8 100644 (file)
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -471,8 +471,7 @@ void __init setup_arch(char **cmdline_p)
        if (LOADER_TYPE && INITRD_START) {
                if (INITRD_START + INITRD_SIZE <= (end_pfn << PAGE_SHIFT)) {
                        reserve_bootmem_generic(INITRD_START, INITRD_SIZE);
-                       initrd_start =
-                               INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
+                       initrd_start = INITRD_START + PAGE_OFFSET;
                        initrd_end = initrd_start+INITRD_SIZE;
                }
                else {
@@ -732,11 +731,8 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
        /* Fix cpuid4 emulation for more */
        num_cache_leaves = 3;
 
-       /* When there is only one core no need to synchronize RDTSC */
-       if (num_possible_cpus() == 1)
-               set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
-       else
-               clear_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
+       /* RDTSC can be speculated around */
+       clear_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
 }
 
 static void __cpuinit detect_ht(struct cpuinfo_x86 *c)
@@ -835,6 +831,15 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
                        set_bit(X86_FEATURE_ARCH_PERFMON, &c->x86_capability);
        }
 
+       if (cpu_has_ds) {
+               unsigned int l1, l2;
+               rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
+               if (!(l1 & (1<<11)))
+                       set_bit(X86_FEATURE_BTS, c->x86_capability);
+               if (!(l1 & (1<<12)))
+                       set_bit(X86_FEATURE_PEBS, c->x86_capability);
+       }
+
        n = c->extended_cpuid_level;
        if (n >= 0x80000008) {
                unsigned eax = cpuid_eax(0x80000008);
@@ -854,7 +859,10 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
                set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
        if (c->x86 == 6)
                set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
-       set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
+       if (c->x86 == 15)
+               set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
+       else
+               clear_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
        c->x86_max_cores = intel_num_cpu_cores(c);
 
        srat_detect_node();