test_hexdump: test all possible group sizes for overflow

[deliverable/linux.git] / lib / iomap_copy.c

diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c
index 4527e751b5e0db75d02a5f513e730a0ac4a6d67b..b8f1d6cbb20057c6b1d7ba880ad20fbfe120c243 100644 (file)
--- a/lib/iomap_copy.c
+++ b/lib/iomap_copy.c
@@ -41,6 +41,27 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
 }
 EXPORT_SYMBOL_GPL(__iowrite32_copy);
 
+/**
+ * __ioread32_copy - copy data from MMIO space, in 32-bit units
+ * @to: destination (must be 32-bit aligned)
+ * @from: source, in MMIO space (must be 32-bit aligned)
+ * @count: number of 32-bit quantities to copy
+ *
+ * Copy data from MMIO space to kernel space, in units of 32 bits at a
+ * time.  Order of access is not guaranteed, nor is a memory barrier
+ * performed afterwards.
+ */
+void __ioread32_copy(void *to, const void __iomem *from, size_t count)
+{
+       u32 *dst = to;
+       const u32 __iomem *src = from;
+       const u32 __iomem *end = src + count;
+
+       while (src < end)
+               *dst++ = __raw_readl(src++);
+}
+EXPORT_SYMBOL_GPL(__ioread32_copy);
+
 /**
  * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
  * @to: destination, in MMIO space (must be 64-bit aligned)