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Workaround create-diff-object issue #1405

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Workaround create-diff-object issue #1405

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4 changes: 3 additions & 1 deletion kpatch-build/create-diff-object.c
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Original file line number Diff line number Diff line change
Expand Up @@ -237,6 +237,7 @@ static void kpatch_bundle_symbols(struct kpatch_elf *kelf)
{
struct symbol *sym;
unsigned int expected_offset;
unsigned int directcall_offset = 16;

list_for_each_entry(sym, &kelf->symbols, list) {
if (is_bundleable(sym)) {
Expand All @@ -247,7 +248,8 @@ static void kpatch_bundle_symbols(struct kpatch_elf *kelf)
else
expected_offset = 0;

if (sym->sym.st_value != expected_offset) {
if (sym->sym.st_value != expected_offset &&
!(getenv("CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS") && sym->sym.st_value == directcall_offset)) {
ERROR("symbol %s at offset %lu within section %s, expected %u",
sym->name, sym->sym.st_value,
sym->sec->name, expected_offset);
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2 changes: 2 additions & 0 deletions kpatch-build/kpatch-build
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Original file line number Diff line number Diff line change
Expand Up @@ -1186,6 +1186,8 @@ else
KBUILD_EXTRA_SYMBOLS="$SYMVERSFILE"
fi

grep -q "CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y" "$CONFIGFILE" && export CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=1

# unsupported kernel option checking
[[ -n "$CONFIG_DEBUG_INFO_SPLIT" ]] && die "kernel option 'CONFIG_DEBUG_INFO_SPLIT' not supported"
[[ -n "$CONFIG_GCC_PLUGIN_LATENT_ENTROPY" ]] && die "kernel option 'CONFIG_GCC_PLUGIN_LATENT_ENTROPY' not supported"
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