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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-07-10 14:25:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-07-10 14:25:59 -0700 |
| commit | ac3f482236793c75caae2c2ebb3f3e5f8b7393e1 (patch) | |
| tree | f769225f9a77ae1e026b18d3d9260f5e5aefe99d /lib | |
| parent | 85be928c4101670f99cdd7c927798aa4dcbb3168 (diff) | |
| parent | f39d1b9792881ce4eb982ec8cc65258bf95674b5 (diff) | |
| download | linux-3.10-ac3f482236793c75caae2c2ebb3f3e5f8b7393e1.tar.gz linux-3.10-ac3f482236793c75caae2c2ebb3f3e5f8b7393e1.tar.bz2 linux-3.10-ac3f482236793c75caae2c2ebb3f3e5f8b7393e1.zip | |
Merge branch 'core-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
dma-debug: Fix the overlap() function to be correct and readable
oprofile: reset bt_lost_no_mapping with other stats
x86/oprofile: rename kernel parameter for architectural perfmon to arch_perfmon
signals: declare sys_rt_tgsigqueueinfo in syscalls.h
rcu: Mark Hierarchical RCU no longer experimental
dma-debug: Put all hash-chain locks into the same lock class
dma-debug: fix off-by-one error in overlap function
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/dma-debug.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 3b93129a968..65b0d99b6d0 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -716,7 +716,7 @@ void dma_debug_init(u32 num_entries) for (i = 0; i < HASH_SIZE; ++i) { INIT_LIST_HEAD(&dma_entry_hash[i].list); - dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; + spin_lock_init(&dma_entry_hash[i].lock); } if (dma_debug_fs_init() != 0) { @@ -856,22 +856,21 @@ static void check_for_stack(struct device *dev, void *addr) "stack [addr=%p]\n", addr); } -static inline bool overlap(void *addr, u64 size, void *start, void *end) +static inline bool overlap(void *addr, unsigned long len, void *start, void *end) { - void *addr2 = (char *)addr + size; + unsigned long a1 = (unsigned long)addr; + unsigned long b1 = a1 + len; + unsigned long a2 = (unsigned long)start; + unsigned long b2 = (unsigned long)end; - return ((addr >= start && addr < end) || - (addr2 >= start && addr2 < end) || - ((addr < start) && (addr2 >= end))); + return !(b1 <= a2 || a1 >= b2); } -static void check_for_illegal_area(struct device *dev, void *addr, u64 size) +static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) { - if (overlap(addr, size, _text, _etext) || - overlap(addr, size, __start_rodata, __end_rodata)) - err_printk(dev, NULL, "DMA-API: device driver maps " - "memory from kernel text or rodata " - "[addr=%p] [size=%llu]\n", addr, size); + if (overlap(addr, len, _text, _etext) || + overlap(addr, len, __start_rodata, __end_rodata)) + err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len); } static void check_sync(struct device *dev, @@ -969,7 +968,8 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, entry->type = dma_debug_single; if (!PageHighMem(page)) { - void *addr = ((char *)page_address(page)) + offset; + void *addr = page_address(page) + offset; + check_for_stack(dev, addr); check_for_illegal_area(dev, addr, size); } |