Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip 0x400e51a4 (fwd)

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 19:23, martedì 6 gennaio 2004, Jeff Chua ha scritto:

> read(3, Kernel panic: Kernel mode fault at addr 0x48965000, ip 0x400df1a4
> It seems to break while reading /dev/kmem
This is likely, since a change to the /dev/kmem driver is in the patch 
starting with 2.4.22-6 (not in -5). It was needed to fix another bug. By the 
way, what is your exact command line? I've a suspect... (but I've been 
careful enough).

diff -Naur -X ../exclude-files orig/drivers/char/mem.c um/drivers/char/mem.c
--- orig/drivers/char/mem.c     2003-08-29 17:25:51.000000000 -0400
+++ um/drivers/char/mem.c       2003-11-09 03:17:45.000000000 -0500
@@ -209,6 +209,8 @@
        return 0;
 }

+extern unsigned long uml_physmem;
+
 /*
  * This function reads the *virtual* memory as seen by the kernel.
  */
@@ -219,7 +221,8 @@
        ssize_t read = 0;
        ssize_t virtr = 0;
        char * kbuf; /* k-addr because vread() takes vmlist_lock rwlock */
-
+
+       p += uml_physmem;
        if (p < (unsigned long) high_memory) {
                read = count;
                if (count > (unsigned long) high_memory - p)
@@ -268,7 +271,7 @@
                }
                free_page((unsigned long)kbuf);
        }
-       *ppos = p;
+       *ppos = p - uml_physmem;
        return virtr + read;
 }


-- 
cat <<EOSIGN
Paolo Giarrusso, aka Blaisorblade
Linux Kernel 2.4.23/2.6.0 on an i686; Linux registered user n. 292729
EOSIGN



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