linux-kernel - Re: [PATCH 21/22] ARM: omap1: use common clk framework

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Date:   Thu, 15 Aug 2019 00:10:02 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Tony Lindgren <tony@...mide.com>, Paul Walmsley <paul@...an.com>,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/22] ARM: omap1: use common clk framework

Hi,

On Thu, Aug 08, 2019 at 11:43:39PM +0200, Arnd Bergmann wrote:
> The omap1 clock driver now uses types and calling conventions
> that are compatible with the common clk core.
> 
> Turn on CONFIG_COMMON_CLK and remove all the code that is
> now duplicated.
> 
> Note: if this previous steps didn't already break it, this one
> most likely will, because the interfaces are very likely to
> have different semantics.

QEMU SX1 board works up to this patch (the I/O virtual address change
included). With this patch, it seems to fail to allocate memory during
omap1_init_early() (the log is a bit messy as I extracted it using QEMU
memory dumping):

swapper: page allocation failure: order:0, mode:0x0(), nodemask=(null)
CPU: 0 PID: 0 Comm: swapper Not tainted 5.3.0-rc4-sx1-los_80efa++ #1
Hardware name: OMAP310 based Siemens SX1
[<c000dc44>] (unwind_backtrace) from [<c000cb00>] (show_stack+0x10/0x18)
[<c000cb00>] (show_stack) from [<c0172ba8>] (dump_stack+0x18/0x24)
[<c0172ba8>] (dump_stack) from [<c00844e8>] (warn_alloc+0x90/0x140)
[<c00844e8>] (warn_alloc) from [<c0084dcc>] (__alloc_pages_nodemask+0x7a4/0x9cc)
[<c0084dcc>] (__alloc_pages_nodemask) from [<c008df24>] (slob_new_pages.constpro
p.2+0x10/0x3c)
[<c008df24>] (slob_new_pages.constprop.2) from [<c008e208>] (slob_alloc.constprop.1+0xe4/0x1e8)
[<c008e208>] (slob_alloc.constprop.1) from [<c008e344>] (__kmalloc+0x38/0xb0)
[<c008e344>] (__kmalloc) from [<c0126514>] (__clk_register+0x20/0x62c)
[<c0126514>] (__clk_register) from [<c01f6614>] (omap1_clk_init+0x88/0x220)
[<c01f6614>] (omap1_clk_init) from [<c01f5820>] (omap1_init_early+0x20/0x30)
[<c01f5820>] (omap1_init_early) from [<c01f09e8>] (start_kernel+0x48/0x408)
[<c01f09e8>] (start_kernel) from [<00000000>] (0x0)
Clocks: ARM_SYSST: 0x003a DPLL_CTL: 0x2002 ARM_CKCTL: 0x3000
Clocking rate (xtal/DPLL1/MPU): 12.0/12.0/0.0 MHz
"8<--- cut here ---
"Unable to handle kernel NULL pointer dereference at virtual address 00000018
"pgd = (ptrval)
"[00000018] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
CPU: 0 PID: 0 Comm: swapper Not tainted 5.3.0-rc4-sx1-los_80efa++ #1
Hardware name: OMAP310 based Siemens SX1
PC is at clk_hw_get_parent+0x4/0x14
LR is at omap1_clk_enable+0xc/0xcc
OMAP310 based Siemens SX1
[    0.000000]  free:0 free_pcp:0 free_cma:0
pc : [<c0126cd0>]    lr : [<c00128d4>]    psr: 600001d3
sp : c03aff88  ip : 00000000  fp : 00000000
r10: 00000001  r9 : 54029252  r8 : 10000100
r7 : c03b1000  r6 : 00002002  r5 : 0000003a  r4 : c03b5444
r3 : 00000000  r2 : c03b9818  r1 : ff03ce08  r0 : c03b5444
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment user
Control: 0000317f  Table: 10004000  DAC: 00000055
Process swapper (pid: 0, stack limit = 0x(ptrval))
Stack: (0xc03aff88 to 0xc03b0000)
ff80:                   c03b5438 0000003a 00002002 c01f6734 00000000 00000057
ffa0: 0000313d c01f5820 00000000 c01f09e8 00000000 00000000 00000000 00000000
ffc0: 00000000 00000000 00000000 c0201a38 00000000 c01f0330 00000057 0000313d
ffe0: 00000265 10000100 54029252 0000317f 00000000 00000000 00000000 00000000
[<c0126cd0>] (clk_hw_get_parent) from [<c00128d4>] (omap1_clk_enable+0xc/0xcc)
[<c00128d4>] (omap1_clk_enable) from [<c01f6734>] (omap1_clk_init+0x1a8/0x220)
[<c01f6734>] (omap1_clk_init) from [<c01f5820>] (omap1_init_early+0x20/0x30)
[<c01f5820>] (omap1_init_early) from [<c01f09e8>] (start_kernel+0x48/0x408)
[<c01f09e8>] (start_kernel) from [<00000000>] (0x0)

A.