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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-15 08:35:12 -0700
committerH. Peter Anvin <hpa@zytor.com>2008-10-16 03:25:58 -0700
commit73bdf0a60e607f4b8ecc5aec597105976565a84f (patch)
treec328c671f0da327a417d8bddb1309371ed216ea2
parentf61f1b5717dec9968efd6c8d61bd73b7a61b72a0 (diff)
downloadop-kernel-dev-73bdf0a60e607f4b8ecc5aec597105976565a84f.zip
op-kernel-dev-73bdf0a60e607f4b8ecc5aec597105976565a84f.tar.gz
Introduce is_vmalloc_or_module_addr() and use with DEBUG_VIRTUAL
Impact: crash on module insertion with CONFIG_DEBUG_VIRTUAL We would incorrectly BUG due to: VIRTUAL_BUG_ON(!is_vmalloc_addr(vmalloc_addr) && !is_module_address(addr)); ... because, at least on x86-64, is_module_address() doesn't do what it should. This patch introduces is_vmalloc_or_module_addr(), which is what we really want anyway, and uses it instead. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--mm/vmalloc.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index bba06c4..f018d7e 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -168,6 +168,21 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
}
EXPORT_SYMBOL_GPL(map_vm_area);
+static inline int is_vmalloc_or_module_addr(const void *x)
+{
+ /*
+ * x86-64 and sparc64 put modules in a special place,
+ * and fall back on vmalloc() if that fails. Others
+ * just put it in the vmalloc space.
+ */
+#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
+ unsigned long addr = (unsigned long)x;
+ if (addr >= MODULES_VADDR && addr < MODULES_END)
+ return 1;
+#endif
+ return is_vmalloc_addr(x);
+}
+
/*
* Map a vmalloc()-space virtual address to the physical page.
*/
@@ -184,8 +199,7 @@ struct page *vmalloc_to_page(const void *vmalloc_addr)
* 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_or_module_addr(vmalloc_addr));
if (!pgd_none(*pgd)) {
pud = pud_offset(pgd, addr);
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