linux-kernel - Re: GIT head no longer boots on x86-64

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Date:	Mon, 13 Oct 2008 12:56:54 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: GIT head no longer boots on x86-64

Could you try the debug patch below to see what address is text_poke trying
to translate?

---
 mm/vmalloc.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index bba06c4..8b8d0a4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -179,13 +179,17 @@ struct page *vmalloc_to_page(const void *vmalloc_addr)
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *ptep, pte;
+	char buf[KSYM_NAME_LEN];
 
 	/*
 	 * XXX we might need to change this if we add VIRTUAL_BUG_ON for
 	 * architectures that do not vmalloc module space
 	 */
-	VIRTUAL_BUG_ON(!is_vmalloc_addr(vmalloc_addr) &&
-			!is_module_address(addr));
+/*	VIRTUAL_BUG_ON(!is_vmalloc_addr(vmalloc_addr) &&
+			!is_module_address(addr));*/
+	sprint_symbol(buf, (unsigned long)__builtin_return_address(0));
+	if (!is_vmalloc_addr(vmalloc_addr) && !is_module_address(addr))
+		printk("BUG? %s (from %s): %p\n", __func__, buf, vmalloc_addr);
 
 	if (!pgd_none(*pgd)) {
 		pud = pud_offset(pgd, addr);
-- 
1.6.0.2

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