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authorLinus Torvalds <torvalds@linux-foundation.org>2017-06-18 12:49:12 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-06-18 12:49:12 +0300
commitedf9364d3f924aff6f77176b8e52a4b68e5c30d6 (patch)
tree5e412c4a86fab4420bf9affbf3cd19cfaecbe8a7 /arch
parent4f51d57f3ff0f30bd805ff5bd04587a6145e1f73 (diff)
parentd9ee35acfabbc909c3be4360cd5655a006628b2e (diff)
downloadlinux-edf9364d3f924aff6f77176b8e52a4b68e5c30d6.tar.xz
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner: "Two fixlets for x86: - Handle WARN_ONs proper with the new UD based WARN implementation - Disable 1G mappings when 2M mappings are disabled by kmemleak or debug_pagealloc. Otherwise 1G mappings might still be used, confusing the debug mechanisms" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Disable 1GB direct mappings when disabling 2MB mappings x86/debug: Handle early WARN_ONs proper
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/extable.h1
-rw-r--r--arch/x86/kernel/traps.c2
-rw-r--r--arch/x86/mm/extable.c3
-rw-r--r--arch/x86/mm/init.c6
4 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86/include/asm/extable.h b/arch/x86/include/asm/extable.h
index b8ad261d11dc..c66d19e3c23e 100644
--- a/arch/x86/include/asm/extable.h
+++ b/arch/x86/include/asm/extable.h
@@ -29,6 +29,7 @@ struct pt_regs;
} while (0)
extern int fixup_exception(struct pt_regs *regs, int trapnr);
+extern int fixup_bug(struct pt_regs *regs, int trapnr);
extern bool ex_has_fault_handler(unsigned long ip);
extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 3995d3a777d4..bf54309b85da 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -182,7 +182,7 @@ int is_valid_bugaddr(unsigned long addr)
return ud == INSN_UD0 || ud == INSN_UD2;
}
-static int fixup_bug(struct pt_regs *regs, int trapnr)
+int fixup_bug(struct pt_regs *regs, int trapnr)
{
if (trapnr != X86_TRAP_UD)
return 0;
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index 35ea061010a1..0ea8afcb929c 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -162,6 +162,9 @@ void __init early_fixup_exception(struct pt_regs *regs, int trapnr)
if (fixup_exception(regs, trapnr))
return;
+ if (fixup_bug(regs, trapnr))
+ return;
+
fail:
early_printk("PANIC: early exception 0x%02x IP %lx:%lx error %lx cr2 0x%lx\n",
(unsigned)trapnr, (unsigned long)regs->cs, regs->ip,
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index cbc87ea98751..9b3f9fa5b283 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -161,16 +161,16 @@ static int page_size_mask;
static void __init probe_page_size_mask(void)
{
-#if !defined(CONFIG_KMEMCHECK)
/*
* For CONFIG_KMEMCHECK or pagealloc debugging, identity mapping will
* use small pages.
* This will simplify cpa(), which otherwise needs to support splitting
* large pages into small in interrupt context, etc.
*/
- if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled())
+ if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled() && !IS_ENABLED(CONFIG_KMEMCHECK))
page_size_mask |= 1 << PG_LEVEL_2M;
-#endif
+ else
+ direct_gbpages = 0;
/* Enable PSE if available */
if (boot_cpu_has(X86_FEATURE_PSE))