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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 /arch/x86/mm/init_64.c
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 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 6dbb0035c57..a02a14f0f32 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -172,8 +172,9 @@ set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
}
/*
- * The head.S code sets up the kernel high mapping from:
- * __START_KERNEL_map to __START_KERNEL_map + KERNEL_TEXT_SIZE
+ * The head.S code sets up the kernel high mapping:
+ *
+ * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
*
* phys_addr holds the negative offset to the kernel, which is added
* to the compile time generated pmds. This results in invalid pmds up