linux-kernel - Re: [PATCH] powerpc/modules: Don't WARN on first module allocation tentative

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Message-Id: <163888363074.3690807.14433778326427790491.b4-ty@ellerman.id.au>
Date:   Wed, 08 Dec 2021 00:27:10 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Erhard Furtner <erhard_f@...lbox.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/modules: Don't WARN on first module allocation tentative

On Tue, 30 Nov 2021 11:10:43 +0100, Christophe Leroy wrote:
> module_alloc() first tries to allocate module text within
> 24 bits direct jump from kernel text, and tries a wider
> allocation if first one fails.
> 
> When first allocation fails the following is observed in kernel logs:
> 
> vmap allocation for size 2400256 failed: use vmalloc=<size> to increase size
> systemd-udevd: vmalloc error: size 2395133, vm_struct allocation failed, mode:0xcc0(GFP_KERNEL), nodemask=(null)
> CPU: 0 PID: 127 Comm: systemd-udevd Tainted: G        W         5.15.5-gentoo-PowerMacG4 #9
> Call Trace:
> [e2a53a50] [c0ba0048] dump_stack_lvl+0x80/0xb0 (unreliable)
> [e2a53a70] [c0540128] warn_alloc+0x11c/0x2b4
> [e2a53b50] [c0531be8] __vmalloc_node_range+0xd8/0x64c
> [e2a53c10] [c00338c0] module_alloc+0xa0/0xac
> [e2a53c40] [c027a368] load_module+0x2ae0/0x8148
> [e2a53e30] [c027fc78] sys_finit_module+0xfc/0x130
> [e2a53f30] [c0035098] ret_from_syscall+0x0/0x28
> --- interrupt: c00 at 0x25df10
> NIP:  0025df10 LR: 00416180 CTR: 00000000
> REGS: e2a53f40 TRAP: 0c00   Tainted: G        W          (5.15.5-gentoo-PowerMacG4)
> MSR:  0000d032 <EE,PR,ME,IR,DR,RI>  CR: 2822242c  XER: 20000000
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/modules: Don't WARN on first module allocation tentative
      https://git.kernel.org/powerpc/c/f1797e4de1146009c888bcf8b6bb6648d55394f1

cheers