linux-kernel - [patch 1/1] oprofile: Add a special cookie for the VDSO region

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Date:	Mon, 11 Dec 2006 15:26:26 +0530
From:	"Amitabha Roy" <amitabha.roy@...il.com>
To:	phil.el@...adoo.fr
Cc:	oprofile-list@...ts.sf.net, linux-kernel@...r.kernel.org
Subject: [patch 1/1] oprofile: Add a special cookie for the VDSO region

Emit a special VDSO_COOKIE for VDSO regions instead of simply marking
them as anon.

Signed-off-by: Amitabha Roy <amitabha.roy@...il.com>
---
diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index 78c2e6e..7f879db 100644
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -250,7 +250,14 @@ static unsigned long lookup_dcookie(stru
 				vma->vm_file->f_path.mnt);
 			*offset = (vma->vm_pgoff << PAGE_SHIFT) + addr -
 				vma->vm_start;
-		} else {
+		}
+#ifdef CONFIG_X86_32
+		else if(mm->context.vdso==vma->vm_start){
+                        cookie = VDSO_COOKIE;
+		        *offset = addr;
+		}
+#endif
+		else {
 			/* must be an anonymous map */
 			*offset = addr;
 		}
diff --git a/drivers/oprofile/event_buffer.h b/drivers/oprofile/event_buffer.h
index 9241627..edc8ee2 100644
--- a/drivers/oprofile/event_buffer.h
+++ b/drivers/oprofile/event_buffer.h
@@ -35,6 +35,7 @@ #define CTX_TGID_CODE			7
 #define TRACE_BEGIN_CODE		8
 #define TRACE_END_CODE			9

+#define VDSO_COOKIE ~1UL
 #define INVALID_COOKIE ~0UL
 #define NO_COOKIE 0UL
-
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