Hi all,
On Tue, 8 Dec 2020 16:02:22 +1100 Stephen Rothwell <s...@canb.auug.org.au>
wrote:
>
> Today's linux-next merge of the ftrace tree got a conflict in:
>
> kernel/trace/ring_buffer.c
>
> between commit:
>
> 68e10d5ff512 ("ring-buffer: Always check to put back before stamp when
> crossing pages")
>
> from Linus' tree and commit:
>
> 5b7be9c709e1 ("ring-buffer: Add test to validate the time stamp deltas")
>
> from the ftrace tree.
>
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging. You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
>
> --
> Cheers,
> Stephen Rothwell
>
> diff --cc kernel/trace/ring_buffer.c
> index a6268e09160a,7cd888ee9ac7..000000000000
> --- a/kernel/trace/ring_buffer.c
> +++ b/kernel/trace/ring_buffer.c
> @@@ -3234,12 -3391,16 +3391,14 @@@ __rb_reserve_next(struct ring_buffer_pe
>
> /* See if we shot pass the end of this buffer page */
> if (unlikely(write > BUF_PAGE_SIZE)) {
> - if (tail != w) {
> - /* before and after may now different, fix it up*/
> - b_ok = rb_time_read(&cpu_buffer->before_stamp,
> &info->before);
> - a_ok = rb_time_read(&cpu_buffer->write_stamp,
> &info->after);
> - if (a_ok && b_ok && info->before != info->after)
> - (void)rb_time_cmpxchg(&cpu_buffer->before_stamp,
> - info->before,
> info->after);
> - }
> + /* before and after may now different, fix it up*/
> + b_ok = rb_time_read(&cpu_buffer->before_stamp, &info->before);
> + a_ok = rb_time_read(&cpu_buffer->write_stamp, &info->after);
> + if (a_ok && b_ok && info->before != info->after)
> + (void)rb_time_cmpxchg(&cpu_buffer->before_stamp,
> + info->before, info->after);
> + if (a_ok && b_ok)
> + check_buffer(cpu_buffer, info, CHECK_FULL_PAGE);
> return rb_move_tail(cpu_buffer, tail, info);
> }
> Just a reminder that this conflict still exists. -- Cheers, Stephen Rothwell
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