PCI: iproc: Fix return value of iproc_msi_irq_domain_alloc()

[mirror_ubuntu-focal-kernel.git] / include / linux / crypto.h

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 19ea3a371d7bb5602ae375fe147c8f34a86e9ad4..0c720a2982ae47c2174cc75b470b45cf6fe6b734 100644 (file)
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -130,9 +130,12 @@
  * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
  * declaration) is used to ensure that the crypto_tfm context structure is
  * aligned correctly for the given architecture so that there are no alignment
- * faults for C data types.  In particular, this is required on platforms such
- * as arm where pointers are 32-bit aligned but there are data types such as
- * u64 which require 64-bit alignment.
+ * faults for C data types.  On architectures that support non-cache coherent
+ * DMA, such as ARM or arm64, it also takes into account the minimal alignment
+ * that is required to ensure that the context struct member does not share any
+ * cachelines with the rest of the struct. This is needed to ensure that cache
+ * maintenance for non-coherent DMA (cache invalidation in particular) does not
+ * affect data that may be accessed by the CPU concurrently.
  */
 #define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN