From: Jeff Dike <jdike@addtoit.com>
To: akpm@osdl.org
Cc: linux-kernel@vger.kernel.org, blaisorblade_spam@yahoo.it
Subject: [PATCH] UML - Error message improvement
Date: Wed, 22 Sep 2004 22:24:26 -0400 [thread overview]
Message-ID: <200409230224.i8N2OQiF004285@ccure.user-mode-linux.org> (raw)
Output a nice error message for people who need mem > 256M but don't increase
on the host /proc/sys/vm/max_map_count, telling them to do so.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Index: linux-2.6.9-rc2-mm1-orig/arch/um/kernel/physmem.c
===================================================================
--- linux-2.6.9-rc2-mm1-orig.orig/arch/um/kernel/physmem.c 2004-09-22 19:51:02.000000000 -0400
+++ linux-2.6.9-rc2-mm1-orig/arch/um/kernel/physmem.c 2004-09-22 20:34:22.000000000 -0400
@@ -336,9 +336,14 @@
fd = phys_mapping(phys, &offset);
err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
- if(err)
+ if(err) {
+ if(err == -ENOMEM)
+ printk("try increasing the host's "
+ "/proc/sys/vm/max_map_count to <physical "
+ "memory size>/4096\n");
panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
"err = %d\n", virt, fd, offset, len, r, w, x, err);
+ }
}
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
reply other threads:[~2004-09-23 1:26 UTC|newest]
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