forked from dynup/kpatch
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
kpatch-build: support CONFIG_LTO_CLANG_THIN
Support CONFIG_LTO_CLANG_THIN with ld.lld --lto-obj-path option. With CONFIG_LTO_CLANG_THIN, .o files are LLVM IR binary, so CDO doesn't work on .o file. To solve this issue, we CDO the thinlto files generated by the --lto-obj-path option. Clang LTO generates the thinlto files after cross file inline, so they are good candidates for CDO. See [1] for more discussions about this. To achieve this, we need: 1. kpatch-build to update kernel Makefile(s) so it generates thinlto files; 2. kpatch-build and kpatch-cc to save the thinlto file properly; 3. kpatch-build to feed these thinlto files to CDO; 4. The user need to supply vmlinux.o, from which we generate the symtab file. We need this because GLOBAL symbols may be marked as LOCAL in LTO vmlinux; [1] dynup#1320 Signed-off-by: Song Liu <[email protected]>
- Loading branch information
1 parent
3672db9
commit 3db1cfb
Showing
2 changed files
with
68 additions
and
9 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters