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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-15 04:31:51 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-15 04:31:51 +0300
commite525de3ab04621d227330aa82cd4073c0b0f3579 (patch)
treef80e7a27b9679b33ddab0446103a65dc6dd65e9b /arch/x86/kernel
parentd4667ca142610961c89ae7c41a823b3358fcdd0e (diff)
parentfd0e786d9d09024f67bd71ec094b110237dc3840 (diff)
downloadlinux-e525de3ab04621d227330aa82cd4073c0b0f3579.tar.xz
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar: "Misc fixes all across the map: - /proc/kcore vsyscall related fixes - LTO fix - build warning fix - CPU hotplug fix - Kconfig NR_CPUS cleanups - cpu_has() cleanups/robustification - .gitignore fix - memory-failure unmapping fix - UV platform fix" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm, mm/hwpoison: Don't unconditionally unmap kernel 1:1 pages x86/error_inject: Make just_return_func() globally visible x86/platform/UV: Fix GAM Range Table entries less than 1GB x86/build: Add arch/x86/tools/insn_decoder_test to .gitignore x86/smpboot: Fix uncore_pci_remove() indexing bug when hot-removing a physical CPU x86/mm/kcore: Add vsyscall page to /proc/kcore conditionally vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page x86/Kconfig: Further simplify the NR_CPUS config x86/Kconfig: Simplify NR_CPUS config x86/MCE: Fix build warning introduced by "x86: do not use print_symbol()" x86/cpufeature: Update _static_cpu_has() to use all named variables x86/cpufeature: Reindent _static_cpu_has()
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/apic/x2apic_uv_x.c15
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce-internal.h15
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c19
-rw-r--r--arch/x86/kernel/smpboot.c1
4 files changed, 39 insertions, 11 deletions
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 46b675aaf20b..f11910b44638 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1176,16 +1176,25 @@ static void __init decode_gam_rng_tbl(unsigned long ptr)
uv_gre_table = gre;
for (; gre->type != UV_GAM_RANGE_TYPE_UNUSED; gre++) {
+ unsigned long size = ((unsigned long)(gre->limit - lgre)
+ << UV_GAM_RANGE_SHFT);
+ int order = 0;
+ char suffix[] = " KMGTPE";
+
+ while (size > 9999 && order < sizeof(suffix)) {
+ size /= 1024;
+ order++;
+ }
+
if (!index) {
pr_info("UV: GAM Range Table...\n");
pr_info("UV: # %20s %14s %5s %4s %5s %3s %2s\n", "Range", "", "Size", "Type", "NASID", "SID", "PN");
}
- pr_info("UV: %2d: 0x%014lx-0x%014lx %5luG %3d %04x %02x %02x\n",
+ pr_info("UV: %2d: 0x%014lx-0x%014lx %5lu%c %3d %04x %02x %02x\n",
index++,
(unsigned long)lgre << UV_GAM_RANGE_SHFT,
(unsigned long)gre->limit << UV_GAM_RANGE_SHFT,
- ((unsigned long)(gre->limit - lgre)) >>
- (30 - UV_GAM_RANGE_SHFT), /* 64M -> 1G */
+ size, suffix[order],
gre->type, gre->nasid, gre->sockid, gre->pnode);
lgre = gre->limit;
diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
index aa0d5df9dc60..e956eb267061 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-internal.h
+++ b/arch/x86/kernel/cpu/mcheck/mce-internal.h
@@ -115,4 +115,19 @@ static inline void mce_unregister_injector_chain(struct notifier_block *nb) { }
extern struct mca_config mca_cfg;
+#ifndef CONFIG_X86_64
+/*
+ * On 32-bit systems it would be difficult to safely unmap a poison page
+ * from the kernel 1:1 map because there are no non-canonical addresses that
+ * we can use to refer to the address without risking a speculative access.
+ * However, this isn't much of an issue because:
+ * 1) Few unmappable pages are in the 1:1 map. Most are in HIGHMEM which
+ * are only mapped into the kernel as needed
+ * 2) Few people would run a 32-bit kernel on a machine that supports
+ * recoverable errors because they have too much memory to boot 32-bit.
+ */
+static inline void mce_unmap_kpfn(unsigned long pfn) {}
+#define mce_unmap_kpfn mce_unmap_kpfn
+#endif
+
#endif /* __X86_MCE_INTERNAL_H__ */
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 3a8e88a611eb..8ff94d1e2dce 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -105,6 +105,10 @@ static struct irq_work mce_irq_work;
static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs);
+#ifndef mce_unmap_kpfn
+static void mce_unmap_kpfn(unsigned long pfn);
+#endif
+
/*
* CPU/chipset specific EDAC code can register a notifier call here to print
* MCE errors in a human-readable form.
@@ -234,7 +238,7 @@ static void __print_mce(struct mce *m)
m->cs, m->ip);
if (m->cs == __KERNEL_CS)
- pr_cont("{%pS}", (void *)m->ip);
+ pr_cont("{%pS}", (void *)(unsigned long)m->ip);
pr_cont("\n");
}
@@ -590,7 +594,8 @@ static int srao_decode_notifier(struct notifier_block *nb, unsigned long val,
if (mce_usable_address(mce) && (mce->severity == MCE_AO_SEVERITY)) {
pfn = mce->addr >> PAGE_SHIFT;
- memory_failure(pfn, 0);
+ if (!memory_failure(pfn, 0))
+ mce_unmap_kpfn(pfn);
}
return NOTIFY_OK;
@@ -1057,12 +1062,13 @@ static int do_memory_failure(struct mce *m)
ret = memory_failure(m->addr >> PAGE_SHIFT, flags);
if (ret)
pr_err("Memory error not recovered");
+ else
+ mce_unmap_kpfn(m->addr >> PAGE_SHIFT);
return ret;
}
-#if defined(arch_unmap_kpfn) && defined(CONFIG_MEMORY_FAILURE)
-
-void arch_unmap_kpfn(unsigned long pfn)
+#ifndef mce_unmap_kpfn
+static void mce_unmap_kpfn(unsigned long pfn)
{
unsigned long decoy_addr;
@@ -1073,7 +1079,7 @@ void arch_unmap_kpfn(unsigned long pfn)
* We would like to just call:
* set_memory_np((unsigned long)pfn_to_kaddr(pfn), 1);
* but doing that would radically increase the odds of a
- * speculative access to the posion page because we'd have
+ * speculative access to the poison page because we'd have
* the virtual address of the kernel 1:1 mapping sitting
* around in registers.
* Instead we get tricky. We create a non-canonical address
@@ -1098,7 +1104,6 @@ void arch_unmap_kpfn(unsigned long pfn)
if (set_memory_np(decoy_addr, 1))
pr_warn("Could not invalidate pfn=0x%lx from 1:1 map\n", pfn);
-
}
#endif
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 6f27facbaa9b..cfc61e1d45e2 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1430,7 +1430,6 @@ static void remove_siblinginfo(int cpu)
cpumask_clear(cpu_llc_shared_mask(cpu));
cpumask_clear(topology_sibling_cpumask(cpu));
cpumask_clear(topology_core_cpumask(cpu));
- c->phys_proc_id = 0;
c->cpu_core_id = 0;
cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
recompute_smt_state();