[GIT PULL] x86 fixes

[Ingo Molnar]

Linus,

Please pull the latest x86-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
x86-urgent-for-linus

   # HEAD: c08d517480ea342cc43acdacc5cf4a795e18151d Revert "x86/PAT: Fix Xorg 
regression on CPUs that don't support PAT"

Misc fixes:

 - revert a broken PAT commit that broke a number of systems,

 - fix two preemptability warnings/bugs that can trigger under certain 
   circumstances, in the debug code and in the microcode loader.

 Thanks,

        Ingo

------------------>
Borislav Petkov (2):
      x86/microcode/AMD: Change load_microcode_amd()'s param to bool to fix 
preemptibility bug
      x86/debug/32: Convert a smp_processor_id() call to raw to avoid 
DEBUG_PREEMPT warning

Ingo Molnar (1):
      Revert "x86/PAT: Fix Xorg regression on CPUs that don't support PAT"


 arch/x86/kernel/cpu/microcode/amd.c | 16 ++++++++--------
 arch/x86/kernel/process_32.c        |  2 +-
 arch/x86/mm/pat.c                   |  9 +++------
 3 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c 
b/arch/x86/kernel/cpu/microcode/amd.c
index 45db4d2ebd01..e9f4d762aa5b 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -320,7 +320,7 @@ void load_ucode_amd_ap(unsigned int cpuid_1_eax)
 }
 
 static enum ucode_state
-load_microcode_amd(int cpu, u8 family, const u8 *data, size_t size);
+load_microcode_amd(bool save, u8 family, const u8 *data, size_t size);
 
 int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
 {
@@ -338,8 +338,7 @@ int __init save_microcode_in_initrd_amd(unsigned int 
cpuid_1_eax)
        if (!desc.mc)
                return -EINVAL;
 
-       ret = load_microcode_amd(smp_processor_id(), x86_family(cpuid_1_eax),
-                                desc.data, desc.size);
+       ret = load_microcode_amd(true, x86_family(cpuid_1_eax), desc.data, 
desc.size);
        if (ret != UCODE_OK)
                return -EINVAL;
 
@@ -675,7 +674,7 @@ static enum ucode_state __load_microcode_amd(u8 family, 
const u8 *data,
 }
 
 static enum ucode_state
-load_microcode_amd(int cpu, u8 family, const u8 *data, size_t size)
+load_microcode_amd(bool save, u8 family, const u8 *data, size_t size)
 {
        enum ucode_state ret;
 
@@ -689,8 +688,8 @@ load_microcode_amd(int cpu, u8 family, const u8 *data, 
size_t size)
 
 #ifdef CONFIG_X86_32
        /* save BSP's matching patch for early load */
-       if (cpu_data(cpu).cpu_index == boot_cpu_data.cpu_index) {
-               struct ucode_patch *p = find_patch(cpu);
+       if (save) {
+               struct ucode_patch *p = find_patch(0);
                if (p) {
                        memset(amd_ucode_patch, 0, PATCH_MAX_SIZE);
                        memcpy(amd_ucode_patch, p->data, min_t(u32, 
ksize(p->data),
@@ -722,11 +721,12 @@ static enum ucode_state request_microcode_amd(int cpu, 
struct device *device,
 {
        char fw_name[36] = "amd-ucode/microcode_amd.bin";
        struct cpuinfo_x86 *c = &cpu_data(cpu);
+       bool bsp = c->cpu_index == boot_cpu_data.cpu_index;
        enum ucode_state ret = UCODE_NFOUND;
        const struct firmware *fw;
 
        /* reload ucode container only on the boot cpu */
-       if (!refresh_fw || c->cpu_index != boot_cpu_data.cpu_index)
+       if (!refresh_fw || !bsp)
                return UCODE_OK;
 
        if (c->x86 >= 0x15)
@@ -743,7 +743,7 @@ static enum ucode_state request_microcode_amd(int cpu, 
struct device *device,
                goto fw_release;
        }
 
-       ret = load_microcode_amd(cpu, c->x86, fw->data, fw->size);
+       ret = load_microcode_amd(bsp, c->x86, fw->data, fw->size);
 
  fw_release:
        release_firmware(fw);
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index ff40e74c9181..ffeae818aa7a 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -78,7 +78,7 @@ void __show_regs(struct pt_regs *regs, int all)
 
        printk(KERN_DEFAULT "EIP: %pS\n", (void *)regs->ip);
        printk(KERN_DEFAULT "EFLAGS: %08lx CPU: %d\n", regs->flags,
-               smp_processor_id());
+               raw_smp_processor_id());
 
        printk(KERN_DEFAULT "EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
                regs->ax, regs->bx, regs->cx, regs->dx);
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 83a59a67757a..9b78685b66e6 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -65,11 +65,9 @@ static int __init nopat(char *str)
 }
 early_param("nopat", nopat);
 
-static bool __read_mostly __pat_initialized = false;
-
 bool pat_enabled(void)
 {
-       return __pat_initialized;
+       return !!__pat_enabled;
 }
 EXPORT_SYMBOL_GPL(pat_enabled);
 
@@ -227,14 +225,13 @@ static void pat_bsp_init(u64 pat)
        }
 
        wrmsrl(MSR_IA32_CR_PAT, pat);
-       __pat_initialized = true;
 
        __init_cache_modes(pat);
 }
 
 static void pat_ap_init(u64 pat)
 {
-       if (!this_cpu_has(X86_FEATURE_PAT)) {
+       if (!boot_cpu_has(X86_FEATURE_PAT)) {
                /*
                 * If this happens we are on a secondary CPU, but switched to
                 * PAT on the boot CPU. We have no way to undo PAT.
@@ -309,7 +306,7 @@ void pat_init(void)
        u64 pat;
        struct cpuinfo_x86 *c = &boot_cpu_data;
 
-       if (!__pat_enabled) {
+       if (!pat_enabled()) {
                init_cache_modes();
                return;
        }