Re: [V181,22/54] x86/cpu_entry_area: Move it out of fixmap

[Thomas Gleixner]

On Thu, 21 Dec 2017, Andrei Vagin wrote:

> Hi Thomas,
> [    0.000000]   DMA32 zone: 520153 pages, LIFO batch:31
> 
> And then it starts booting again...

Yes. It triple faults. Aside of having made the area one page too small, my
approach of changing this was just naive.

Andrey rescued me and provided the fix below. Thanks again!

Thanks,

	tglx

---
 arch/x86/mm/kasan_init_64.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 6353b8d31e6a..47388f0c0e59 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -323,32 +323,33 @@ void __init kasan_init(void)
 		map_range(&pfn_mapped[i]);
 	}
 
-	kasan_populate_zero_shadow(
-		kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
-		kasan_mem_to_shadow((void *)__START_KERNEL_map));
-
-	kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),
-			      (unsigned long)kasan_mem_to_shadow(_end),
-			      early_pfn_to_nid(__pa(_stext)));
-
 	shadow_cpu_entry_begin = (void *)CPU_ENTRY_AREA_BASE;
 	shadow_cpu_entry_begin = kasan_mem_to_shadow(shadow_cpu_entry_begin);
 	shadow_cpu_entry_begin = (void *)round_down((unsigned long)shadow_cpu_entry_begin,
 						PAGE_SIZE);
 
 	shadow_cpu_entry_end = (void *)(CPU_ENTRY_AREA_BASE +
-					CPU_ENTRY_AREA_TOT_SIZE);
+					CPU_ENTRY_AREA_MAP_SIZE);
 	shadow_cpu_entry_end = kasan_mem_to_shadow(shadow_cpu_entry_end);
 	shadow_cpu_entry_end = (void *)round_up((unsigned long)shadow_cpu_entry_end,
 					PAGE_SIZE);
 
-	kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
-				   shadow_cpu_entry_begin);
+	kasan_populate_zero_shadow(
+		kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
+		shadow_cpu_entry_begin);
 
 	kasan_populate_shadow((unsigned long)shadow_cpu_entry_begin,
 			      (unsigned long)shadow_cpu_entry_end, 0);
 
-	kasan_populate_zero_shadow(shadow_cpu_entry_end, (void *)KASAN_SHADOW_END);
+	kasan_populate_zero_shadow(shadow_cpu_entry_end,
+				kasan_mem_to_shadow((void *)__START_KERNEL_map));
+
+	kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),
+			      (unsigned long)kasan_mem_to_shadow(_end),
+			      early_pfn_to_nid(__pa(_stext)));
+
+	kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
+				(void *)KASAN_SHADOW_END);
 
 	load_cr3(init_top_pgt);
 	__flush_tlb_all();
-- 
2.13.6