From: Peter Zijlstra <peterz@infradead.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
Ingo Molnar <mingo@kernel.org>,
x86@kernel.org, masahiroy@kernel.org, michal.lkml@markovi.net,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [tip: objtool/core] jump_label, x86: Allow short NOPs
Date: Wed, 30 Jun 2021 09:38:30 +0200 [thread overview]
Message-ID: <YNwfdltMu44wnoLH@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <YNwYGVdB3QI1kcLL@hirez.programming.kicks-ass.net>
On Wed, Jun 30, 2021 at 09:07:05AM +0200, Peter Zijlstra wrote:
> On Tue, Jun 29, 2021 at 09:35:37PM +0100, Matthew Wilcox wrote:
> > On Tue, Jun 29, 2021 at 09:01:25PM +0100, Matthew Wilcox wrote:
> > > So this got merged without the corresponding Kbuild update being merged,
> > > and my kernel failed to boot. Bisect got as far as
> > >
> > > $ git bisect good
> > > Bisecting: 4 revisions left to test after this (roughly 2 steps)
> > > [ab3257042c26d0cd44793c741e2f89bf38b21fe8] jump_label, x86: Allow short NOPs
> > >
> > > before my sluggish memory remembered this thread from six weeks ago.
> > >
> > > So if anybody else hits this, do a make clean.
> >
> > Actually, this is a different bug with the same symptom.
> >
> > Applying the patch from Peter, and running it:
> >
> > $ ./.build_test_kernel-x86_64/tools/objtool/objtool check -abdJsuld .build_test_kernel-x86_64/vmlinux.o
> > nr_sections: 15446
> > section_bits: 13
> > nr_symbols: 116448
> > symbol_bits: 16
> > max_reloc: 8031700
> > tot_reloc: 12477754
> > reloc_bits: 19
> > nr_insns: 2523443
> > .build_test_kernel-x86_64/vmlinux.o: warning: objtool: want_init_on_free()+0x0: jump-label unpatched
> >
> > This is against a freshly built kernel -- i removed the build directory,
> > copied in a .config file and built a fresh kernel.
>
> You happen to have said .config for me?
Also GCC version I suppose. The thing I'm wondering about in particular
is what translation unit is responsible for that symbol.
AFAICT the function itself is an inline from linux/mm.h, but I cannot
find any of the files or functions it's used in as being excluded from
objtool coverage :/
prev parent reply other threads:[~2021-06-30 7:40 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-06 19:33 [PATCH 00/13] jump_label: Yet another attempt at variable sized jump_labels Peter Zijlstra
2021-05-06 19:33 ` [PATCH 01/13] objtool: Rewrite hashtable sizing Peter Zijlstra
2021-05-12 10:41 ` Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-06-10 18:14 ` [PATCH 01/13] " Nathan Chancellor
2021-06-10 18:43 ` Peter Zijlstra
2021-06-10 18:54 ` Nathan Chancellor
2021-06-10 18:50 ` Sami Tolvanen
2021-06-10 19:33 ` Peter Zijlstra
2021-06-10 19:43 ` Sami Tolvanen
2021-06-10 20:59 ` Nathan Chancellor
2021-06-14 13:19 ` [tip: objtool/core] objtool: Improve reloc hash size guestimate tip-bot2 for Peter Zijlstra
2021-05-06 19:33 ` [PATCH 02/13] x86,objtool: Dont exclude arch/x86/realmode/ Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] x86, objtool: " tip-bot2 for Peter Zijlstra
2021-05-06 19:33 ` [PATCH 03/13] jump_label, x86: Strip ASM jump_label support Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:33 ` [PATCH 04/13] jump_label, x86: Factor out the __jump_table generation Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:33 ` [PATCH 05/13] jump_label, x86: Improve error when we fail expected text Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:33 ` [PATCH 06/13] jump_label, x86: Introduce jump_entry_size() Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:33 ` [PATCH 07/13] jump_label, x86: Add variable length patching support Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-13 14:16 ` [PATCH 07.5/13] jump_label,x86: Remove unused JUMP_LABEL_NOP_SIZE Peter Zijlstra
2021-05-14 7:01 ` [tip: objtool/core] jump_label/x86: " tip-bot2 for Peter Zijlstra
2021-05-06 19:34 ` [PATCH 08/13] jump_label: Free jump_entry::key bit1 for build use Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:34 ` [PATCH 09/13] jump_label,x86: Emit short JMP Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] jump_label, x86: " tip-bot2 for Peter Zijlstra
2021-05-06 19:34 ` [PATCH 10/13] objtool: Decode jump_entry::key addend Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:34 ` [PATCH 11/13] objtool: Rewrite jump_label instructions Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-06 19:34 ` [PATCH 12/13] objtool: Provide stats for jump_labels Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2021-05-13 14:15 ` [PATCH 12.5/13] objtool: Reflow handle_jump_alt() Peter Zijlstra
2021-05-06 19:34 ` [PATCH 13/13] jump_label,x86: Allow short NOPs Peter Zijlstra
2021-05-06 19:49 ` Peter Zijlstra
2021-05-12 13:19 ` [tip: objtool/core] jump_label, x86: " tip-bot2 for Peter Zijlstra
2021-05-18 19:50 ` Peter Zijlstra
2021-05-18 20:24 ` Peter Zijlstra
2021-05-19 0:44 ` Josh Poimboeuf
2021-05-19 6:56 ` Peter Zijlstra
2021-06-29 20:00 ` Matthew Wilcox
2021-06-29 20:35 ` Matthew Wilcox
2021-06-30 7:07 ` Peter Zijlstra
2021-06-30 7:38 ` Peter Zijlstra [this message]
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