From 6535a39ffa88d24e7b277737e6a7405181f68710 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Wed, 15 Jan 2020 18:43:05 +0000 Subject: [PATCH] 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 Cc: Jiri Slaby Signed-off-by: Will Deacon Link: https://lore.kernel.org/r/20200115184305.1187-1-will@kernel.org Signed-off-by: Jonathan Corbet --- Documentation/asm-annotations.rst | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/Documentation/asm-annotations.rst b/Documentation/asm-annotations.rst index f55c2bb74d00..32ea57483378 100644 --- a/Documentation/asm-annotations.rst +++ b/Documentation/asm-annotations.rst @@ -73,10 +73,11 @@ The new macros are prefixed with the ``SYM_`` prefix and can be divided into 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 -- 2.20.1