Discourage assumptions that simply don't hold for all Linux ABIs.
Exceptions to the natural alignment rule for scalar types include
long long on i386 and sh.
---
Documentation/core-api/unaligned-memory-access.rst | 7 -------
1 file changed, 7 deletions(-)
diff --git a/Documentation/core-api/unaligned-memory-access.rst b/Documentation/core-api/unaligned-memory-access.rst
index 5ceeb80eb539..1390ce2b7291 100644
--- a/Documentation/core-api/unaligned-memory-access.rst
+++ b/Documentation/core-api/unaligned-memory-access.rst
@@ -40,9 +40,6 @@ The rule mentioned above forms what we refer to as natural alignment:
When accessing N bytes of memory, the base memory address must be evenly
divisible by N, i.e. addr % N == 0.
-When writing code, assume the target architecture has natural alignment
-requirements.
-
In reality, only a few architectures require natural alignment on all sizes
of memory access. However, we must consider ALL supported architectures;
writing code that satisfies natural alignment requirements is the easiest way
@@ -103,10 +100,6 @@ Therefore, for standard structure types you can always rely on the compiler
to pad structures so that accesses to fields are suitably aligned (assuming
you do not cast the field to a type of different length).
-Similarly, you can also rely on the compiler to align variables and function
-parameters to a naturally aligned scheme, based on the size of the type of
-the variable.
-
At this point, it should be clear that accessing a single byte (u8 or char)
will never cause an unaligned access, because all memory addresses are evenly
divisible by one.
--
2.49.1