linux-kernel - Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression

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Message-ID: <4097023.1700084620@warthog.procyon.org.uk>
Date:   Wed, 15 Nov 2023 21:43:40 +0000
From:   David Howells <dhowells@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     dhowells@...hat.com, Borislav Petkov <bp@...en8.de>,
        kernel test robot <oliver.sang@...el.com>,
        oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Christian Brauner <christian@...uner.io>,
        Matthew Wilcox <willy@...radead.org>,
        David Laight <David.Laight@...lab.com>, ying.huang@...el.com,
        feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression

I get:

  LD      arch/x86/purgatory/purgatory.chk
ld: arch/x86/purgatory/purgatory.ro:(.altinstr_replacement+0x1): undefined reference to `rep_movs_alternative'
ld: arch/x86/purgatory/purgatory.ro:(.altinstr_replacement+0x6): undefined reference to `rep_movs_alternative'

The symbol is available in the arch lib directory:

warthog>nm build3/arch/x86/lib/copy_user_64.o 
0000000000000000 r __export_symbol_rep_movs_alternative
0000000000000000 T rep_movs_alternative
                 U __x86_return_thunk

so I'm not sure what's going on there.

David