Documentation: Call out example SYM_FUNC_* usage as x86-specific
The example given in asm-annotations.rst to describe the constraints that
a function should meet in order to be annotated with a SYM_FUNC_* macro
is x86-specific, and not necessarily applicable to architectures using
branch-and-link style calling conventions such as arm64.
Tweak the example text to call out the x86-specific text.
Cc: Mark Brown <broonie@kernel.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200115184305.1187-1-will@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/asm-annotations.rst b/Documentation/asm-annotations.rst
index f55c2bb..32ea574 100644
--- a/Documentation/asm-annotations.rst
+++ b/Documentation/asm-annotations.rst
@@ -73,10 +73,11 @@
three main groups:
1. ``SYM_FUNC_*`` -- to annotate C-like functions. This means functions with
- standard C calling conventions, i.e. the stack contains a return address at
- the predefined place and a return from the function can happen in a
- standard way. When frame pointers are enabled, save/restore of frame
- pointer shall happen at the start/end of a function, respectively, too.
+ standard C calling conventions. For example, on x86, this means that the
+ stack contains a return address at the predefined place and a return from
+ the function can happen in a standard way. When frame pointers are enabled,
+ save/restore of frame pointer shall happen at the start/end of a function,
+ respectively, too.
Checking tools like ``objtool`` should ensure such marked functions conform
to these rules. The tools can also easily annotate these functions with