Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 27 insertions, 10 deletions

diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index c383ce440d9..cc1172b2687 100644
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -14,6 +14,7 @@
 #include <linux/bootmem.h>
 #include <linux/elf.h>
 #include <asm/ipl.h>
+#include <asm/os_info.h>
 
 #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
 #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
@@ -51,7 +52,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 /*
  * Copy memory from old kernel
  */
-static int copy_from_oldmem(void *dest, void *src, size_t count)
+int copy_from_oldmem(void *dest, void *src, size_t count)
 {
 	unsigned long copied = 0;
 	int rc;
@@ -224,28 +225,44 @@ static void *nt_prpsinfo(void *ptr)
 }
 
 /*
- * Initialize vmcoreinfo note (new kernel)
+ * Get vmcoreinfo using lowcore->vmcore_info (new kernel)
  */
-static void *nt_vmcoreinfo(void *ptr)
+static void *get_vmcoreinfo_old(unsigned long *size)
 {
 	char nt_name[11], *vmcoreinfo;
 	Elf64_Nhdr note;
 	void *addr;
 
 	if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
-		return ptr;
+		return NULL;
 	memset(nt_name, 0, sizeof(nt_name));
 	if (copy_from_oldmem(&note, addr, sizeof(note)))
-		return ptr;
+		return NULL;
 	if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1))
-		return ptr;
+		return NULL;
 	if (strcmp(nt_name, "VMCOREINFO") != 0)
-		return ptr;
-	vmcoreinfo = kzalloc_panic(note.n_descsz + 1);
+		return NULL;
+	vmcoreinfo = kzalloc_panic(note.n_descsz);
 	if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz))
+		return NULL;
+	*size = note.n_descsz;
+	return vmcoreinfo;
+}
+
+/*
+ * Initialize vmcoreinfo note (new kernel)
+ */
+static void *nt_vmcoreinfo(void *ptr)
+{
+	unsigned long size;
+	void *vmcoreinfo;
+
+	vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
+	if (!vmcoreinfo)
+		vmcoreinfo = get_vmcoreinfo_old(&size);
+	if (!vmcoreinfo)
 		return ptr;
-	vmcoreinfo[note.n_descsz + 1] = 0;
-	return nt_init(ptr, 0, vmcoreinfo, note.n_descsz, "VMCOREINFO");
+	return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
 }
 
 /*