linux-kernel - Re: [PATCH 5.18 001/879] arm64: Initialize jump labels before setup_machine

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Message-ID: <YqCO0533IQytsG5L@kroah.com>
Date:   Wed, 8 Jun 2022 13:58:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH 5.18 001/879] arm64: Initialize jump labels before
 setup_machine_fdt()

On Wed, Jun 08, 2022 at 10:11:37AM +0100, Catalin Marinas wrote:
> On Tue, Jun 07, 2022 at 06:51:59PM +0200, Greg Kroah-Hartman wrote:
> > From: Stephen Boyd <swboyd@...omium.org>
> > 
> > commit 73e2d827a501d48dceeb5b9b267a4cd283d6b1ae upstream.
> > 
> > A static key warning splat appears during early boot on arm64 systems
> > that credit randomness from devicetrees that contain an "rng-seed"
> > property. This is because setup_machine_fdt() is called before
> > jump_label_init() during setup_arch(). Let's swap the order of these two
> > calls so that jump labels are initialized before the devicetree is
> > unflattened and the rng seed is credited.
> > 
> >  static_key_enable_cpuslocked(): static key '0xffffffe51c6fcfc0' used before call to jump_label_init()
> >  WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:166 static_key_enable_cpuslocked+0xb0/0xb8
> >  Modules linked in:
> >  CPU: 0 PID: 0 Comm: swapper Not tainted 5.18.0+ #224 44b43e377bfc84bc99bb5ab885ff694984ee09ff
> >  pstate: 600001c9 (nZCv dAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >  pc : static_key_enable_cpuslocked+0xb0/0xb8
> >  lr : static_key_enable_cpuslocked+0xb0/0xb8
> >  sp : ffffffe51c393cf0
> >  x29: ffffffe51c393cf0 x28: 000000008185054c x27: 00000000f1042f10
> >  x26: 0000000000000000 x25: 00000000f10302b2 x24: 0000002513200000
> >  x23: 0000002513200000 x22: ffffffe51c1c9000 x21: fffffffdfdc00000
> >  x20: ffffffe51c2f0831 x19: ffffffe51c6fcfc0 x18: 00000000ffff1020
> >  x17: 00000000e1e2ac90 x16: 00000000000000e0 x15: ffffffe51b710708
> >  x14: 0000000000000066 x13: 0000000000000018 x12: 0000000000000000
> >  x11: 0000000000000000 x10: 00000000ffffffff x9 : 0000000000000000
> >  x8 : 0000000000000000 x7 : 61632065726f6665 x6 : 6220646573752027
> >  x5 : ffffffe51c641d25 x4 : ffffffe51c13142c x3 : ffff0a00ffffff05
> >  x2 : 40000000ffffe003 x1 : 00000000000001c0 x0 : 0000000000000065
> >  Call trace:
> >   static_key_enable_cpuslocked+0xb0/0xb8
> >   static_key_enable+0x2c/0x40
> >   crng_set_ready+0x24/0x30
> >   execute_in_process_context+0x80/0x90
> >   _credit_init_bits+0x100/0x154
> >   add_bootloader_randomness+0x64/0x78
> >   early_init_dt_scan_chosen+0x140/0x184
> >   early_init_dt_scan_nodes+0x28/0x4c
> >   early_init_dt_scan+0x40/0x44
> >   setup_machine_fdt+0x7c/0x120
> >   setup_arch+0x74/0x1d8
> >   start_kernel+0x84/0x44c
> >   __primary_switched+0xc0/0xc8
> >  ---[ end trace 0000000000000000 ]---
> >  random: crng init done
> >  Machine model: Google Lazor (rev1 - 2) with LTE
> > 
> > Cc: Hsin-Yi Wang <hsinyi@...omium.org>
> > Cc: Douglas Anderson <dianders@...omium.org>
> > Cc: Ard Biesheuvel <ardb@...nel.org>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Jason A. Donenfeld <Jason@...c4.com>
> > Cc: Dominik Brodowski <linux@...inikbrodowski.net>
> > Fixes: f5bda35fba61 ("random: use static branch for crng_ready()")
> > Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> > Reviewed-by: Jason A. Donenfeld <Jason@...c4.com>
> > Link: https://lore.kernel.org/r/20220602022109.780348-1-swboyd@chromium.org
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Please drop this patch from 5.18 stable (I think I gave the details on
> the 5.10 reply).
> 

Dropped from all stable queues now, thanks.

greg k-h