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authorLinus Torvalds <torvalds@linux-foundation.org>2021-01-31 11:48:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-01-31 11:48:12 -0800
commitf5a376eddec424f00e38aa19bd26c2febbfc934d (patch)
tree8bead178bea50804794386fa777f8ed3d78d758f /include
parent17b756d0376fd45f98abb6d758c3d5befb01e3fa (diff)
parent0bab9cb2d980d7c075cffb9216155f7835237f98 (diff)
Merge tag 'x86_entry_for_v5.11_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Borislav Petkov: "A single fix for objtool to generate proper unwind info for newer toolchains which do not generate section symbols anymore. And a cleanup ontop. This was originally going to go during the next merge window but people can already trigger a build error with binutils-2.36 which doesn't emit section symbols - something which objtool relies on - so let's expedite it" * tag 'x86_entry_for_v5.11_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/entry: Remove put_ret_addr_in_rdi THUNK macro argument x86/entry: Emit a symbol for register restoring thunk
Diffstat (limited to 'include')
-rw-r--r--include/linux/linkage.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index 5bcfbd972e97..dbf8506decca 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -178,6 +178,11 @@
* Objtool generates debug info for both FUNC & CODE, but needs special
* annotations for each CODE's start (to describe the actual stack frame).
*
+ * Objtool requires that all code must be contained in an ELF symbol. Symbol
+ * names that have a .L prefix do not emit symbol table entries. .L
+ * prefixed symbols can be used within a code region, but should be avoided for
+ * denoting a range of code via ``SYM_*_START/END`` annotations.
+ *
* ALIAS -- does not generate debug info -- the aliased function will
*/