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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-15 08:35:12 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-16 03:25:58 -0700 |
| commit | 73bdf0a60e607f4b8ecc5aec597105976565a84f (patch) | |
| tree | c328c671f0da327a417d8bddb1309371ed216ea2 /mm | |
| parent | f61f1b5717dec9968efd6c8d61bd73b7a61b72a0 (diff) | |
| download | linux-73bdf0a60e607f4b8ecc5aec597105976565a84f.tar.gz linux-73bdf0a60e607f4b8ecc5aec597105976565a84f.tar.xz | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmalloc.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index bba06c41fc59..f018d7e0addb 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); |