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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:24:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:24:24 -0700
commit35c23d5d797629a83389bf5dccc5e4a7fb477504 (patch)
tree6031a0713cb1434cd9334dc23665b08d43738313
parent57935b262c40a3cbe54c5a61be230331a48f0a3a (diff)
parent719038de98bc8479b771c582a1e4a1e86079da22 (diff)
Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
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
-rw-r--r--arch/x86/Kconfig.debug1
-rw-r--r--arch/x86/include/asm/processor.h2
-rw-r--r--arch/x86/kernel/Makefile2
-rw-r--r--arch/x86/kernel/cpu/intel_cacheinfo.c52
-rw-r--r--arch/x86/kernel/doublefault.c (renamed from arch/x86/kernel/doublefault_32.c)15
-rw-r--r--arch/x86/kernel/traps.c3
6 files changed, 45 insertions, 30 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index c198b7e13e7..b6a770132b6 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -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
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 22224b3b43b..5b87d52eed0 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -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 */
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 7bd3bd31010..4ce822ed58f 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -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
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 7c6f7d548c0..8dc72dda66f 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -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;
}
}
}
diff --git a/arch/x86/kernel/doublefault_32.c b/arch/x86/kernel/doublefault.c
index 155a13f33ed..5d3fe8d36e4 100644
--- a/arch/x86/kernel/doublefault_32.c
+++ b/arch/x86/kernel/doublefault.c
@@ -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
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 772e2a846de..167d481c5fd 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -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).