From: Russell King <rmk@arm.linux.org.uk>
Date: Fri, 15 Mar 2002 06:44:26 +0000 (-0800)
Subject: [PATCH] 2.4 and 2.5: fix /proc/kcore
X-Git-Tag: v2.5.7-pre2~34
X-Git-Url: http://git.neil.brown.name/?a=commitdiff_plain;h=80d504c82b889e18a4d7bfc889d848a5e17b2eb1;p=history.git

[PATCH] 2.4 and 2.5: fix /proc/kcore

As mentioned on May 11 on LKML, here is a patch to fix /proc/kcore for
architectures which do not have RAM located at physical address 0.
---

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 26366a908ddc..f17b3fcd5357 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -381,8 +381,13 @@ static ssize_t read_kcore(struct file *file, char *buffer, size_t buflen, loff_t
 			return tsz;
 	}
 #endif
-	/* fill the remainder of the buffer from kernel VM space */
-	start = (unsigned long)__va(*fpos - elf_buflen);
+	
+	/*
+	 * Fill the remainder of the buffer from kernel VM space.
+	 * We said in the ELF header that the data which starts
+	 * at 'elf_buflen' is virtual address PAGE_OFFSET. --rmk
+	 */
+	start = PAGE_OFFSET + (*fpos - elf_buflen);
 	if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
 		tsz = buflen;