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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse source 
Pull x86 fixes from Ingo Molnar:
 "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"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "x86/PAT: Fix Xorg regression on CPUs that don't support PAT"
  x86/debug/32: Convert a smp_processor_id() call to raw to avoid DEBUG_PREEMPT warning
  x86/microcode/AMD: Change load_microcode_amd()'s param to bool to fix preemptibility bug
This commit is contained in:
Linus Torvalds 2017-06-02 08:53:42 -07:00
commit f2a025defd
3 changed files with 12 additions and 15 deletions
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16
arch/x86/kernel/cpu/microcode/amd.c
View file

@ -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);

2
arch/x86/kernel/process_32.c
View file

@ -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);

9
arch/x86/mm/pat.c
View file

@ -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;
}