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authorIngo Molnar <mingo@elte.hu>2008-02-21 11:04:11 +0100
committerIngo Molnar <mingo@elte.hu>2008-02-26 12:55:56 +0100
commit88f3aec7afd9ae3e6f6d221801996b69aad1e3a4 (patch)
tree676a32c7bd248a15f2926bc6dcd03ace4971d442 /include/asm-x86
parent3b57bc461fd5019aef4cfc77d4faf56ebe95449c (diff)
x86: fix spontaneous reboot with allyesconfig bzImage
recently the 64-bit allyesconfig bzImage kernel started spontaneously rebooting during early bootup. after a few fun hours spent with early init debugging, it turns out that we've got this rather annoying limit on the size of the kernel image: #define KERNEL_TEXT_SIZE (40*1024*1024) which limit my vmlinux just happened to pass: text data bss dec hex filename 29703744 4222751 8646224 42572719 2899baf vmlinux 40 MB is 42572719 bytes, so my vmlinux was just 1.5% above this limit :-/ So it happily crashed right in head_64.S, which - as we all know - is the most debuggable code in the whole architecture ;-) So increase the limit to allow an up to 128MB kernel image to be mapped. (should anyone be that crazy or lazy) We have a full 4K of pagetable (level2_kernel_pgt) allocated for these mappings already, so there's no RAM overhead and the limit was rather pointless and arbitrary. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/page_64.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/asm-x86/page_64.h b/include/asm-x86/page_64.h
index f7393bc516e..3e2e3ca6304 100644
--- a/include/asm-x86/page_64.h
+++ b/include/asm-x86/page_64.h
@@ -47,8 +47,12 @@
#define __PHYSICAL_MASK_SHIFT 46
#define __VIRTUAL_MASK_SHIFT 48
-#define KERNEL_TEXT_SIZE (40*1024*1024)
-#define KERNEL_TEXT_START _AC(0xffffffff80000000, UL)
+/*
+ * Kernel image size is limited to 128 MB (see level2_kernel_pgt in
+ * arch/x86/kernel/head_64.S), and it is mapped here:
+ */
+#define KERNEL_TEXT_SIZE (128*1024*1024)
+#define KERNEL_TEXT_START _AC(0xffffffff80000000, UL)
#ifndef __ASSEMBLY__
void clear_page(void *page);