On 4/2/21 11:08 AM, Arnaldo wrote:
On April 2, 2021 2:42:21 PM GMT-03:00, Yonghong Song <yhs@xxxxxx> wrote:
On 4/2/21 10:23 AM, Yonghong Song wrote:
:> Thanks. I checked out the branch and did some testing with latest
clang
trunk (just pulled in).
With kernel LTO note support, I tested gcc non-lto, and llvm-lto
mode,
it works fine.
Without kernel LTO note support, I tested
gcc non-lto <=== ok
llvm non-lto <=== not ok
llvm lto <=== ok
Surprisingly llvm non-lto vmlinux had the same "tcp_slow_start"
issue.
Some previous version of clang does not have this issue.
I double checked the dwarfdump and it is indeed has the same reason
for lto vmlinux. I checked abbrev section and there is no cross-cu
references.
That means we need to adapt this patch
dwarf_loader: Handle subprogram ret type with abstract_origin
properly
for non merging case as well.
The previous patch fixed lto subprogram abstract_origin issue,
I will submit a followup patch for this.
Actually, the change is pretty simple,
diff --git a/dwarf_loader.c b/dwarf_loader.c
index 5dea837..82d7131 100644
--- a/dwarf_loader.c
+++ b/dwarf_loader.c
@@ -2323,7 +2323,11 @@ static int die__process_and_recode(Dwarf_Die
*die, struct cu *cu)
int ret = die__process(die, cu);
if (ret != 0)
return ret;
- return cu__recode_dwarf_types(cu);
+ ret = cu__recode_dwarf_types(cu);
+ if (ret != 0)
+ return ret;
+
+ return cu__resolve_func_ret_types(cu);
}
Arnaldo, do you just want to fold into previous patches, or
you want me to submit a new one?
I can take care of that.
Arnaldo, just in case that you missed it, please remember
to fold the above changes to the patch:
[PATCH dwarves] dwarf_loader: handle subprogram ret type with
abstract_origin properly
Thanks!
And I think it's time for to look at Jiri's test suite... :-)
It's a holiday here, so I'll take some time to get to this, hopefully I'll tag 1.21 tomorrow tho.
Cheers,
- Arnaldo
