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

Browse source 
Pull x86 cpu updates from Ingo Molnar:
 "Two changes:

   - Extend 32-bit double fault debugging aid to 64-bit
   - Fix a build warning"

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/intel/cacheinfo: Shut up last long-standing warning
  x86: Extend #DF debugging aid to 64-bit
This commit is contained in:
Linus Torvalds 2013-07-02 16:24:24 -07:00
commit 35c23d5d79
6 changed files with 45 additions and 30 deletions
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1
arch/x86/Kconfig.debug
View file

@ -122,7 +122,6 @@ config DEBUG_NX_TEST
config DOUBLEFAULT
default y
bool "Enable doublefault exception handler" if EXPERT
depends on X86_32
---help---
This option allows trapping of rare doublefault exceptions that
would otherwise cause a system to silently reboot. Disabling this

2
arch/x86/include/asm/processor.h
View file

@ -981,5 +981,5 @@ bool xen_set_default_idle(void);
#endif
void stop_this_cpu(void *dummy);
void df_debug(struct pt_regs *regs, long error_code);
#endif /* _ASM_X86_PROCESSOR_H */

2
arch/x86/kernel/Makefile
View file

@ -67,7 +67,7 @@ obj-$(CONFIG_KEXEC) += relocate_kernel_$(BITS).o crash.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump_$(BITS).o
obj-y += kprobes/
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_DOUBLEFAULT) += doublefault_32.o
obj-$(CONFIG_DOUBLEFAULT) += doublefault.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_VM86) += vm86_32.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o

52
arch/x86/kernel/cpu/intel_cacheinfo.c
View file

@ -618,36 +618,34 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
* parameters cpuid leaf to find the cache details
*/
for (i = 0; i < num_cache_leaves; i++) {
struct _cpuid4_info_regs this_leaf;
struct _cpuid4_info_regs this_leaf = {};
int retval;
retval = cpuid4_cache_lookup_regs(i, &this_leaf);
if (retval >= 0) {
switch (this_leaf.eax.split.level) {
case 1:
if (this_leaf.eax.split.type ==
CACHE_TYPE_DATA)
new_l1d = this_leaf.size/1024;
else if (this_leaf.eax.split.type ==
CACHE_TYPE_INST)
new_l1i = this_leaf.size/1024;
break;
case 2:
new_l2 = this_leaf.size/1024;
num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
index_msb = get_count_order(num_threads_sharing);
l2_id = c->apicid & ~((1 << index_msb) - 1);
break;
case 3:
new_l3 = this_leaf.size/1024;
num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
index_msb = get_count_order(
num_threads_sharing);
l3_id = c->apicid & ~((1 << index_msb) - 1);
break;
default:
break;
}
if (retval < 0)
continue;
switch (this_leaf.eax.split.level) {
case 1:
if (this_leaf.eax.split.type == CACHE_TYPE_DATA)
new_l1d = this_leaf.size/1024;
else if (this_leaf.eax.split.type == CACHE_TYPE_INST)
new_l1i = this_leaf.size/1024;
break;
case 2:
new_l2 = this_leaf.size/1024;
num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
index_msb = get_count_order(num_threads_sharing);
l2_id = c->apicid & ~((1 << index_msb) - 1);
break;
case 3:
new_l3 = this_leaf.size/1024;
num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
index_msb = get_count_order(num_threads_sharing);
l3_id = c->apicid & ~((1 << index_msb) - 1);
break;
default:
break;
}
}
}

15
arch/x86/kernel/doublefault_32.c → arch/x86/kernel/doublefault.c
View file

@ -9,6 +9,8 @@
#include <asm/processor.h>
#include <asm/desc.h>
#ifdef CONFIG_X86_32
#define DOUBLEFAULT_STACKSIZE (1024)
static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE];
#define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE)
@ -67,3 +69,16 @@ struct tss_struct doublefault_tss __cacheline_aligned = {
.__cr3 = __pa_nodebug(swapper_pg_dir),
}
};
/* dummy for do_double_fault() call */
void df_debug(struct pt_regs *regs, long error_code) {}
#else /* !CONFIG_X86_32 */
void df_debug(struct pt_regs *regs, long error_code)
{
pr_emerg("PANIC: double fault, error_code: 0x%lx\n", error_code);
show_regs(regs);
panic("Machine halted.");
}
#endif

3
arch/x86/kernel/traps.c
View file

@ -254,6 +254,9 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
tsk->thread.error_code = error_code;
tsk->thread.trap_nr = X86_TRAP_DF;
#ifdef CONFIG_DOUBLEFAULT
df_debug(regs, error_code);
#endif
/*
* This is always a kernel trap and never fixable (and thus must
* never return).