path: root/samples
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authorJessica Yu <>2016-03-22 20:03:18 -0400
committerJiri Kosina <>2016-04-01 15:00:11 +0200
commit425595a7fc2096ab46c741b5ed5372c5ab5bbeac (patch)
tree9cf12348ba352e7679be0aadf370aa0a7bc5509e /samples
parentf31e0960f395df0c9197de53674365e2a28a129b (diff)
livepatch: reuse module loader code to write relocations
Reuse module loader code to write relocations, thereby eliminating the need for architecture specific relocation code in livepatch. Specifically, reuse the apply_relocate_add() function in the module loader to write relocations instead of duplicating functionality in livepatch's arch-dependent klp_write_module_reloc() function. In order to accomplish this, livepatch modules manage their own relocation sections (marked with the SHF_RELA_LIVEPATCH section flag) and livepatch-specific symbols (marked with SHN_LIVEPATCH symbol section index). To apply livepatch relocation sections, livepatch symbols referenced by relocs are resolved and then apply_relocate_add() is called to apply those relocations. In addition, remove x86 livepatch relocation code and the s390 klp_write_module_reloc() function stub. They are no longer needed since relocation work has been offloaded to module loader. Lastly, mark the module as a livepatch module so that the module loader canappropriately identify and initialize it. Signed-off-by: Jessica Yu <> Reviewed-by: Miroslav Benes <> Acked-by: Josh Poimboeuf <> Acked-by: Heiko Carstens <> # for s390 changes Signed-off-by: Jiri Kosina <>
Diffstat (limited to 'samples')
1 files changed, 1 insertions, 0 deletions
diff --git a/samples/livepatch/livepatch-sample.c b/samples/livepatch/livepatch-sample.c
index fb8c8614e728..e34f871e69b1 100644
--- a/samples/livepatch/livepatch-sample.c
+++ b/samples/livepatch/livepatch-sample.c
@@ -89,3 +89,4 @@ static void livepatch_exit(void)
+MODULE_INFO(livepatch, "Y");