On Tue, 2023-11-28 at 10:13 -0600, Daniel Xu wrote:
[...]
> > One thing for sure is memory layout of bitfields should be the same
> > for both clang and gcc as it is determined by C standard. Register
> > representation and how to manipulate could be different for different
> > compilers.
>
> I
On Tue, Nov 28, 2023 at 10:13:50AM -0600, Daniel Xu wrote:
> On Mon, Nov 27, 2023 at 08:06:01PM -0800, Yonghong Song wrote:
> >
> > On 11/27/23 7:01 PM, Daniel Xu wrote:
> > > On Mon, Nov 27, 2023 at 02:45:11PM -0600, Daniel Xu wrote:
> > > > On Sun, Nov 26, 2023 at 09:53:04PM -0800, Yonghong
On Mon, Nov 27, 2023 at 08:06:01PM -0800, Yonghong Song wrote:
>
> On 11/27/23 7:01 PM, Daniel Xu wrote:
> > On Mon, Nov 27, 2023 at 02:45:11PM -0600, Daniel Xu wrote:
> > > On Sun, Nov 26, 2023 at 09:53:04PM -0800, Yonghong Song wrote:
> > > > On 11/27/23 12:44 AM, Yonghong Song wrote:
> > > > >
On Mon, Nov 27, 2023 at 8:06 PM Yonghong Song wrote:
>
>
> On 11/27/23 7:01 PM, Daniel Xu wrote:
> > On Mon, Nov 27, 2023 at 02:45:11PM -0600, Daniel Xu wrote:
> >> On Sun, Nov 26, 2023 at 09:53:04PM -0800, Yonghong Song wrote:
> >>> On 11/27/23 12:44 AM, Yonghong Song wrote:
> On 11/26/23
On 11/27/23 7:01 PM, Daniel Xu wrote:
On Mon, Nov 27, 2023 at 02:45:11PM -0600, Daniel Xu wrote:
On Sun, Nov 26, 2023 at 09:53:04PM -0800, Yonghong Song wrote:
On 11/27/23 12:44 AM, Yonghong Song wrote:
On 11/26/23 8:52 PM, Eduard Zingerman wrote:
On Sun, 2023-11-26 at 18:04 -0600, Daniel
On Mon, Nov 27, 2023 at 02:45:11PM -0600, Daniel Xu wrote:
> On Sun, Nov 26, 2023 at 09:53:04PM -0800, Yonghong Song wrote:
> >
> > On 11/27/23 12:44 AM, Yonghong Song wrote:
> > >
> > > On 11/26/23 8:52 PM, Eduard Zingerman wrote:
> > > > On Sun, 2023-11-26 at 18:04 -0600, Daniel Xu wrote:
> >
On Sun, Nov 26, 2023 at 09:53:04PM -0800, Yonghong Song wrote:
>
> On 11/27/23 12:44 AM, Yonghong Song wrote:
> >
> > On 11/26/23 8:52 PM, Eduard Zingerman wrote:
> > > On Sun, 2023-11-26 at 18:04 -0600, Daniel Xu wrote:
> > > [...]
> > > > > Tbh I'm not sure. This test passes with
On 11/27/23 12:44 AM, Yonghong Song wrote:
On 11/26/23 8:52 PM, Eduard Zingerman wrote:
On Sun, 2023-11-26 at 18:04 -0600, Daniel Xu wrote:
[...]
Tbh I'm not sure. This test passes with preserve_static_offset
because it suppresses preserve_access_index. In general clang
translates bitfield
On 11/26/23 8:52 PM, Eduard Zingerman wrote:
On Sun, 2023-11-26 at 18:04 -0600, Daniel Xu wrote:
[...]
Tbh I'm not sure. This test passes with preserve_static_offset
because it suppresses preserve_access_index. In general clang
translates bitfield access to a set of IR statements like:
C:
On 11/26/23 3:14 PM, Eduard Zingerman wrote:
On Sat, 2023-11-25 at 20:22 -0800, Yonghong Song wrote:
[...]
--- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
@@ -6,7 +6,10 @@
* modify it under the terms of version 2 of the
On Sun, 2023-11-26 at 18:04 -0600, Daniel Xu wrote:
[...]
> > Tbh I'm not sure. This test passes with preserve_static_offset
> > because it suppresses preserve_access_index. In general clang
> > translates bitfield access to a set of IR statements like:
> >
> > C:
> > struct foo {
> >
Hi,
On Sun, Nov 26, 2023 at 10:14:21PM +0200, Eduard Zingerman wrote:
> On Sat, 2023-11-25 at 20:22 -0800, Yonghong Song wrote:
> [...]
> > --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > @@ -6,7 +6,10 @@
> >*
On Sat, 2023-11-25 at 20:22 -0800, Yonghong Song wrote:
[...]
> --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> @@ -6,7 +6,10 @@
>* modify it under the terms of version 2 of the GNU General Public
>* License as
On 11/25/23 7:54 PM, Alexei Starovoitov wrote:
On Sat, Nov 25, 2023 at 4:52 PM Yonghong Song wrote:
diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
index 3065a716544d..ec7e04e012ae 100644
---
On Sat, Nov 25, 2023 at 4:52 PM Yonghong Song wrote:
>
> >
> > diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > index 3065a716544d..ec7e04e012ae 100644
> > --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
>
On 11/22/23 1:20 PM, Daniel Xu wrote:
Switching to vmlinux.h definitions seems to make the verifier very
unhappy with bitfield accesses. The error is:
; md.u.md2.dir = direction;
33: (69) r1 = *(u16 *)(r2 +11)
misaligned stack access off (0x0; 0x0)+-64+11 size 2
It looks like
Switching to vmlinux.h definitions seems to make the verifier very
unhappy with bitfield accesses. The error is:
; md.u.md2.dir = direction;
33: (69) r1 = *(u16 *)(r2 +11)
misaligned stack access off (0x0; 0x0)+-64+11 size 2
It looks like disabling CO-RE relocations seem to make the
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