Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "18 patches.

  Subsystems affected by this patch series: mm (pagealloc, memcg, kasan,
  memory-failure, and highmem), ubsan, proc, and MAINTAINERS"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  MAINTAINERS: add a couple more files to the Clang/LLVM section
  proc_sysctl: fix oops caused by incorrect command parameters
  powerpc/mm/highmem: use __set_pte_at() for kmap_local()
  mips/mm/highmem: use set_pte() for kmap_local()
  mm/highmem: prepare for overriding set_pte_at()
  sparc/mm/highmem: flush cache and TLB
  mm: fix page reference leak in soft_offline_page()
  ubsan: disable unsigned-overflow check for i386
  kasan, mm: fix resetting page_alloc tags for HW_TAGS
  kasan, mm: fix conflicts with init_on_alloc/free
  kasan: fix HW_TAGS boot parameters
  kasan: fix incorrect arguments passing in kasan_add_zero_shadow
  kasan: fix unaligned address is unhandled in kasan_remove_zero_shadow
  mm: fix numa stats for thp migration
  mm: memcg: fix memcg file_dirty numa stat
  mm: memcg/slab: optimize objcg stock draining
  mm: fix initialization of struct page for holes in memory layout
  x86/setup: don't remove E820_TYPE_RAM for pfn 0

4 files changed, 17 insertions, 15 deletions

diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h
index 19edf8e69971..292d0425717f 100644
--- a/arch/mips/include/asm/highmem.h
+++ b/arch/mips/include/asm/highmem.h
@@ -51,6 +51,7 @@ extern void kmap_flush_tlb(unsigned long addr);
 
 #define flush_cache_kmaps()	BUG_ON(cpu_has_dc_aliases)
 
+#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	set_pte(ptep, ptev)
 #define arch_kmap_local_post_map(vaddr, pteval)	local_flush_tlb_one(vaddr)
 #define arch_kmap_local_post_unmap(vaddr)	local_flush_tlb_one(vaddr)
 
diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index 80a5ae771c65..c0fcd1bbdba9 100644
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -58,6 +58,8 @@ extern pte_t *pkmap_page_table;
 
 #define flush_cache_kmaps()	flush_cache_all()
 
+#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	\
+	__set_pte_at(mm, vaddr, ptep, ptev, 1)
 #define arch_kmap_local_post_map(vaddr, pteval)	\
 	local_flush_tlb_page(NULL, vaddr)
 #define arch_kmap_local_post_unmap(vaddr)	\
diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h
index 875116209ec1..c7b2e208328b 100644
--- a/arch/sparc/include/asm/highmem.h
+++ b/arch/sparc/include/asm/highmem.h
@@ -50,10 +50,11 @@ extern pte_t *pkmap_page_table;
 
 #define flush_cache_kmaps()	flush_cache_all()
 
-/* FIXME: Use __flush_tlb_one(vaddr) instead of flush_cache_all() -- Anton */
-#define arch_kmap_local_post_map(vaddr, pteval)	flush_cache_all()
-#define arch_kmap_local_post_unmap(vaddr)	flush_cache_all()
-
+/* FIXME: Use __flush_*_one(vaddr) instead of flush_*_all() -- Anton */
+#define arch_kmap_local_pre_map(vaddr, pteval)	flush_cache_all()
+#define arch_kmap_local_pre_unmap(vaddr)	flush_cache_all()
+#define arch_kmap_local_post_map(vaddr, pteval)	flush_tlb_all()
+#define arch_kmap_local_post_unmap(vaddr)	flush_tlb_all()
 
 #endif /* __KERNEL__ */
 
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 740f3bdb3f61..3412c4595efd 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -661,17 +661,6 @@ static void __init trim_platform_memory_ranges(void)
 static void __init trim_bios_range(void)
 {
 	/*
-	 * A special case is the first 4Kb of memory;
-	 * This is a BIOS owned area, not kernel ram, but generally
-	 * not listed as such in the E820 table.
-	 *
-	 * This typically reserves additional memory (64KiB by default)
-	 * since some BIOSes are known to corrupt low memory.  See the
-	 * Kconfig help text for X86_RESERVE_LOW.
-	 */
-	e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
-
-	/*
 	 * special case: Some BIOSes report the PC BIOS
 	 * area (640Kb -> 1Mb) as RAM even though it is not.
 	 * take them out.
@@ -728,6 +717,15 @@ early_param("reservelow", parse_reservelow);
 
 static void __init trim_low_memory_range(void)
 {
+	/*
+	 * A special case is the first 4Kb of memory;
+	 * This is a BIOS owned area, not kernel ram, but generally
+	 * not listed as such in the E820 table.
+	 *
+	 * This typically reserves additional memory (64KiB by default)
+	 * since some BIOSes are known to corrupt low memory.  See the
+	 * Kconfig help text for X86_RESERVE_LOW.
+	 */
 	memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
 }