Merge branch 'akpm' (patchbomb from Andrew Morton)

Merge incoming from Andrew Morton:
 - Various misc things.
 - arch/sh updates.
 - Part of ocfs2.  Review is slow.
 - Slab updates.
 - Most of -mm.
 - printk updates.
 - lib/ updates.
 - checkpatch updates.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (226 commits)
  checkpatch: update $declaration_macros, add uninitialized_var
  checkpatch: warn on missing spaces in broken up quoted
  checkpatch: fix false positives for --strict "space after cast" test
  checkpatch: fix false positive MISSING_BREAK warnings with --file
  checkpatch: add test for native c90 types in unusual order
  checkpatch: add signed generic types
  checkpatch: add short int to c variable types
  checkpatch: add for_each tests to indentation and brace tests
  checkpatch: fix brace style misuses of else and while
  checkpatch: add --fix option for a couple OPEN_BRACE misuses
  checkpatch: use the correct indentation for which()
  checkpatch: add fix_insert_line and fix_delete_line helpers
  checkpatch: add ability to insert and delete lines to patch/file
  checkpatch: add an index variable for fixed lines
  checkpatch: warn on break after goto or return with same tab indentation
  checkpatch: emit a warning on file add/move/delete
  checkpatch: add test for commit id formatting style in commit log
  checkpatch: emit fewer kmalloc_array/kcalloc conversion warnings
  checkpatch: improve "no space after cast" test
  checkpatch: allow multiple const * types
  ...

Documentation/RCU/whatisRCU.txt

@@ -818,7 +818,7 @@ RCU pointer/list update:
 	list_add_tail_rcu
 	list_del_rcu
 	list_replace_rcu
-	hlist_add_after_rcu
+	hlist_add_behind_rcu
 	hlist_add_before_rcu
 	hlist_add_head_rcu
 	hlist_del_rcu

Documentation/kernel-parameters.txt

@@ -1716,8 +1716,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			7 (KERN_DEBUG)		debug-level messages
 
 	log_buf_len=n[KMG]	Sets the size of the printk ring buffer,
-			in bytes.  n must be a power of two.  The default
-			size is set in the kernel config file.
+			in bytes.  n must be a power of two and greater
+			than the minimal size. The minimal size is defined
+			by LOG_BUF_SHIFT kernel config parameter. There is
+			also CONFIG_LOG_CPU_MAX_BUF_SHIFT config parameter
+			that allows to increase the default size depending on
+			the number of CPUs. See init/Kconfig for more details.
 
 	logo.nologo	[FB] Disables display of the built-in Linux logo.
 			This may be used to provide more screen space for

Documentation/trace/postprocess/trace-vmscan-postprocess.pl

@@ -47,6 +47,10 @@
 use constant HIGH_NR_SCANNED			=> 22;
 use constant HIGH_NR_TAKEN			=> 23;
 use constant HIGH_NR_RECLAIMED			=> 24;
+use constant HIGH_NR_FILE_SCANNED		=> 25;
+use constant HIGH_NR_ANON_SCANNED		=> 26;
+use constant HIGH_NR_FILE_RECLAIMED		=> 27;
+use constant HIGH_NR_ANON_RECLAIMED		=> 28;
 
 my %perprocesspid;
 my %perprocess;
@@ -56,14 +60,18 @@
 
 my $total_wakeup_kswapd;
 my ($total_direct_reclaim, $total_direct_nr_scanned);
+my ($total_direct_nr_file_scanned, $total_direct_nr_anon_scanned);
 my ($total_direct_latency, $total_kswapd_latency);
 my ($total_direct_nr_reclaimed);
+my ($total_direct_nr_file_reclaimed, $total_direct_nr_anon_reclaimed);
 my ($total_direct_writepage_file_sync, $total_direct_writepage_file_async);
 my ($total_direct_writepage_anon_sync, $total_direct_writepage_anon_async);
 my ($total_kswapd_nr_scanned, $total_kswapd_wake);
+my ($total_kswapd_nr_file_scanned, $total_kswapd_nr_anon_scanned);
 my ($total_kswapd_writepage_file_sync, $total_kswapd_writepage_file_async);
 my ($total_kswapd_writepage_anon_sync, $total_kswapd_writepage_anon_async);
 my ($total_kswapd_nr_reclaimed);
+my ($total_kswapd_nr_file_reclaimed, $total_kswapd_nr_anon_reclaimed);
 
 # Catch sigint and exit on request
 my $sigint_report = 0;
@@ -374,6 +382,7 @@ sub process_events {
 			}
 			my $isolate_mode = $1;
 			my $nr_scanned = $4;
+			my $file = $6;
 
 			# To closer match vmstat scanning statistics, only count isolate_both
 			# and isolate_inactive as scanning. isolate_active is rotation
@@ -382,6 +391,11 @@ sub process_events {
 			# isolate_both     == 3
 			if ($isolate_mode != 2) {
 				$perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;
+				if ($file == 1) {
+					$perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED} += $nr_scanned;
+				} else {
+					$perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED} += $nr_scanned;
+				}
 			}
 		} elsif ($tracepoint eq "mm_vmscan_lru_shrink_inactive") {
 			$details = $6;
@@ -391,8 +405,19 @@ sub process_events {
 				print "         $regex_lru_shrink_inactive/o\n";
 				next;
 			}
+
 			my $nr_reclaimed = $4;
+			my $flags = $6;
+			my $file = 0;
+			if ($flags =~ /RECLAIM_WB_FILE/) {
+				$file = 1;
+			}
 			$perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED} += $nr_reclaimed;
+			if ($file) {
+				$perprocesspid{$process_pid}->{HIGH_NR_FILE_RECLAIMED} += $nr_reclaimed;
+			} else {
+				$perprocesspid{$process_pid}->{HIGH_NR_ANON_RECLAIMED} += $nr_reclaimed;
+			}
 		} elsif ($tracepoint eq "mm_vmscan_writepage") {
 			$details = $6;
 			if ($details !~ /$regex_writepage/o) {
@@ -493,7 +518,11 @@ sub dump_stats {
 		$total_direct_reclaim += $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 		$total_wakeup_kswapd += $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 		$total_direct_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
+		$total_direct_nr_file_scanned += $stats{$process_pid}->{HIGH_NR_FILE_SCANNED};
+		$total_direct_nr_anon_scanned += $stats{$process_pid}->{HIGH_NR_ANON_SCANNED};
 		$total_direct_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
+		$total_direct_nr_file_reclaimed += $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
+		$total_direct_nr_anon_reclaimed += $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 		$total_direct_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 		$total_direct_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 		$total_direct_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
@@ -513,7 +542,11 @@ sub dump_stats {
 			$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN},
 			$stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD},
 			$stats{$process_pid}->{HIGH_NR_SCANNED},
+			$stats{$process_pid}->{HIGH_NR_FILE_SCANNED},
+			$stats{$process_pid}->{HIGH_NR_ANON_SCANNED},
 			$stats{$process_pid}->{HIGH_NR_RECLAIMED},
+			$stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED},
+			$stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED},
 			$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 			$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC},
 			$this_reclaim_delay / 1000);
@@ -552,7 +585,11 @@ sub dump_stats {
 
 		$total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 		$total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
+		$total_kswapd_nr_file_scanned += $stats{$process_pid}->{HIGH_NR_FILE_SCANNED};
+		$total_kswapd_nr_anon_scanned += $stats{$process_pid}->{HIGH_NR_ANON_SCANNED};
 		$total_kswapd_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
+		$total_kswapd_nr_file_reclaimed += $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
+		$total_kswapd_nr_anon_reclaimed += $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 		$total_kswapd_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 		$total_kswapd_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 		$total_kswapd_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
@@ -563,7 +600,11 @@ sub dump_stats {
 			$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE},
 			$stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP},
 			$stats{$process_pid}->{HIGH_NR_SCANNED},
+			$stats{$process_pid}->{HIGH_NR_FILE_SCANNED},
+			$stats{$process_pid}->{HIGH_NR_ANON_SCANNED},
 			$stats{$process_pid}->{HIGH_NR_RECLAIMED},
+			$stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED},
+			$stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED},
 			$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 			$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC});
 
@@ -594,7 +635,11 @@ sub dump_stats {
 	print "\nSummary\n";
 	print "Direct reclaims:     			$total_direct_reclaim\n";
 	print "Direct reclaim pages scanned:		$total_direct_nr_scanned\n";
+	print "Direct reclaim file pages scanned:	$total_direct_nr_file_scanned\n";
+	print "Direct reclaim anon pages scanned:	$total_direct_nr_anon_scanned\n";
 	print "Direct reclaim pages reclaimed:		$total_direct_nr_reclaimed\n";
+	print "Direct reclaim file pages reclaimed:	$total_direct_nr_file_reclaimed\n";
+	print "Direct reclaim anon pages reclaimed:	$total_direct_nr_anon_reclaimed\n";
 	print "Direct reclaim write file sync I/O:	$total_direct_writepage_file_sync\n";
 	print "Direct reclaim write anon sync I/O:	$total_direct_writepage_anon_sync\n";
 	print "Direct reclaim write file async I/O:	$total_direct_writepage_file_async\n";
@@ -604,7 +649,11 @@ sub dump_stats {
 	print "\n";
 	print "Kswapd wakeups:				$total_kswapd_wake\n";
 	print "Kswapd pages scanned:			$total_kswapd_nr_scanned\n";
+	print "Kswapd file pages scanned:		$total_kswapd_nr_file_scanned\n";
+	print "Kswapd anon pages scanned:		$total_kswapd_nr_anon_scanned\n";
 	print "Kswapd pages reclaimed:			$total_kswapd_nr_reclaimed\n";
+	print "Kswapd file pages reclaimed:		$total_kswapd_nr_file_reclaimed\n";
+	print "Kswapd anon pages reclaimed:		$total_kswapd_nr_anon_reclaimed\n";
 	print "Kswapd reclaim write file sync I/O:	$total_kswapd_writepage_file_sync\n";
 	print "Kswapd reclaim write anon sync I/O:	$total_kswapd_writepage_anon_sync\n";
 	print "Kswapd reclaim write file async I/O:	$total_kswapd_writepage_file_async\n";
@@ -629,7 +678,11 @@ ()
 		$perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD} += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 		$perprocess{$process}->{HIGH_KSWAPD_REWAKEUP} += $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP};
 		$perprocess{$process}->{HIGH_NR_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_SCANNED};
+		$perprocess{$process}->{HIGH_NR_FILE_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED};
+		$perprocess{$process}->{HIGH_NR_ANON_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED};
 		$perprocess{$process}->{HIGH_NR_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED};
+		$perprocess{$process}->{HIGH_NR_FILE_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
+		$perprocess{$process}->{HIGH_NR_ANON_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 		$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 		$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 		$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};

Makefile

@@ -621,6 +621,9 @@ else
 KBUILD_CFLAGS	+= -O2
 endif
 
+# Tell gcc to never replace conditional load with a non-conditional one
+KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
+
 ifdef CONFIG_READABLE_ASM
 # Disable optimizations that make assembler listings hard to read.
 # reorder blocks reorders the control in the function
@@ -636,6 +639,22 @@ KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 endif
 
 # Handle stack protector mode.
+#
+# Since kbuild can potentially perform two passes (first with the old
+# .config values and then with updated .config values), we cannot error out
+# if a desired compiler option is unsupported. If we were to error, kbuild
+# could never get to the second pass and actually notice that we changed
+# the option to something that was supported.
+#
+# Additionally, we don't want to fallback and/or silently change which compiler
+# flags will be used, since that leads to producing kernels with different
+# security feature characteristics depending on the compiler used. ("But I
+# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
+#
+# The middle ground is to warn here so that the failed option is obvious, but
+# to let the build fail with bad compiler flags so that we can't produce a
+# kernel when there is a CONFIG and compiler mismatch.
+#
 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
   stackp-flag := -fstack-protector
   ifeq ($(call cc-option, $(stackp-flag)),)

arch/arm/mm/dma-mapping.c

@@ -26,6 +26,7 @@
 #include <linux/io.h>
 #include <linux/vmalloc.h>
 #include <linux/sizes.h>
+#include <linux/cma.h>
 
 #include <asm/memory.h>
 #include <asm/highmem.h>

arch/ia64/mm/init.c

@@ -631,7 +631,8 @@ int arch_add_memory(int nid, u64 start, u64 size)
 
 	pgdat = NODE_DATA(nid);
 
-	zone = pgdat->node_zones + ZONE_NORMAL;
+	zone = pgdat->node_zones +
+		zone_for_memory(nid, start, size, ZONE_NORMAL);
 	ret = __add_pages(nid, zone, start_pfn, nr_pages);
 
 	if (ret)

arch/powerpc/kvm/Makefile

@@ -90,7 +90,6 @@ kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \
 	book3s_hv_rm_mmu.o \
 	book3s_hv_ras.o \
 	book3s_hv_builtin.o \
-	book3s_hv_cma.o \
 	$(kvm-book3s_64-builtin-xics-objs-y)
 endif
 

arch/powerpc/kvm/book3s_64_mmu_hv.c

@@ -37,8 +37,6 @@
 #include <asm/ppc-opcode.h>
 #include <asm/cputable.h>
 
-#include "book3s_hv_cma.h"
-
 /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
 #define MAX_LPID_970	63
 
@@ -64,10 +62,10 @@ long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp)
 	}
 
 	kvm->arch.hpt_cma_alloc = 0;
-	VM_BUG_ON(order < KVM_CMA_CHUNK_ORDER);
 	page = kvm_alloc_hpt(1 << (order - PAGE_SHIFT));
 	if (page) {
 		hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page));
+		memset((void *)hpt, 0, (1 << order));
 		kvm->arch.hpt_cma_alloc = 1;
 	}
 

arch/powerpc/kvm/book3s_hv_builtin.c

@@ -16,12 +16,14 @@
 #include <linux/init.h>
 #include <linux/memblock.h>
 #include <linux/sizes.h>
+#include <linux/cma.h>
 
 #include <asm/cputable.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 
-#include "book3s_hv_cma.h"
+#define KVM_CMA_CHUNK_ORDER	18
+
 /*
  * Hash page table alignment on newer cpus(CPU_FTR_ARCH_206)
  * should be power of 2.
@@ -43,6 +45,8 @@ static unsigned long kvm_cma_resv_ratio = 5;
 unsigned long kvm_rma_pages = (1 << 27) >> PAGE_SHIFT;	/* 128MB */
 EXPORT_SYMBOL_GPL(kvm_rma_pages);
 
+static struct cma *kvm_cma;
+
 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
    Assumes POWER7 or PPC970. */
 static inline int lpcr_rmls(unsigned long rma_size)
@@ -97,7 +101,7 @@ struct kvm_rma_info *kvm_alloc_rma()
 	ri = kmalloc(sizeof(struct kvm_rma_info), GFP_KERNEL);
 	if (!ri)
 		return NULL;
-	page = kvm_alloc_cma(kvm_rma_pages, kvm_rma_pages);
+	page = cma_alloc(kvm_cma, kvm_rma_pages, get_order(kvm_rma_pages));
 	if (!page)
 		goto err_out;
 	atomic_set(&ri->use_count, 1);
@@ -112,7 +116,7 @@ EXPORT_SYMBOL_GPL(kvm_alloc_rma);
 void kvm_release_rma(struct kvm_rma_info *ri)
 {
 	if (atomic_dec_and_test(&ri->use_count)) {
-		kvm_release_cma(pfn_to_page(ri->base_pfn), kvm_rma_pages);
+		cma_release(kvm_cma, pfn_to_page(ri->base_pfn), kvm_rma_pages);
 		kfree(ri);
 	}
 }
@@ -131,16 +135,18 @@ struct page *kvm_alloc_hpt(unsigned long nr_pages)
 {
 	unsigned long align_pages = HPT_ALIGN_PAGES;
 
+	VM_BUG_ON(get_order(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
+
 	/* Old CPUs require HPT aligned on a multiple of its size */
 	if (!cpu_has_feature(CPU_FTR_ARCH_206))
 		align_pages = nr_pages;
-	return kvm_alloc_cma(nr_pages, align_pages);
+	return cma_alloc(kvm_cma, nr_pages, get_order(align_pages));
 }
 EXPORT_SYMBOL_GPL(kvm_alloc_hpt);
 
 void kvm_release_hpt(struct page *page, unsigned long nr_pages)
 {
-	kvm_release_cma(page, nr_pages);
+	cma_release(kvm_cma, page, nr_pages);
 }
 EXPORT_SYMBOL_GPL(kvm_release_hpt);
 
@@ -179,7 +185,8 @@ void __init kvm_cma_reserve(void)
 			align_size = HPT_ALIGN_PAGES << PAGE_SHIFT;
 
 		align_size = max(kvm_rma_pages << PAGE_SHIFT, align_size);
-		kvm_cma_declare_contiguous(selected_size, align_size);
+		cma_declare_contiguous(0, selected_size, 0, align_size,
+			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma);
 	}
 }