On Sun, Feb 12, 2023 at 10:14:13AM -0800, Guenter Roeck wrote:
On 2/12/23 10:06, Conor Dooley wrote:
On Sun, Feb 12, 2023 at 05:06:09PM +0000, Conor Dooley wrote:
On Sun, Feb 12, 2023 at 04:33:58PM +0000, Conor Dooley wrote:
On Sun, Feb 12, 2023 at 03:59:59PM +0000, Conor Dooley wrote:
So as not to lead anyone up the garden path, let me correct myself:
Hmm, so this appears to be us attempting to patch in alternatives where
none actually exists - seemingly F & D.
And of course that's not true, riscv_has_extension_likely() now uses
alternatives as of:
bdda5d554e43 ("riscv: introduce riscv_has_extension_[un]likely()")
From a quick look, it just happens that the only users are F & D.
Samuel pointed out that this is a lockdep splat on irc.
There's a patch on the list that removes the lockdep annotation
entirely:
https://patchwork.kernel.org/project/linux-riscv/patch/20230202114116.3695793-1-changbin.du@xxxxxxxxxx/
So ye, no surprises that it was config based!
Palmer posted a "better" fix for that lockdep warning a while ago:
https://lore.kernel.org/all/20220322022331.32136-1-palmer@xxxxxxxxxxxx/
So we'd have to duplicate/reuse that for cpufeature/errata patching.
This does not (only) happen in stop_machine().
Yah, sorry I meant that it's the same lockdep splat as is being
addressed there.
The first patch deletes the lockdep stuff entirely, so removes the
splat. I was thinking that we'd need to take Palmer's (IMO better)
patch and do the same thing for patching alternatives, but I figure we
can just take the text_mutex itself for alternatives & not have to
dance around the lock.
I'll go do that I suppose!