openrisc: Move FPU state out of pt_regs

My original, naive, FPU support patch had the FPCSR register stored
during both the *mode switch* and *context switch*. This is wasteful.

Also, the original

openrisc: Move FPU state out of pt_regs

My original, naive, FPU support patch had the FPCSR register stored
during both the *mode switch* and *context switch*. This is wasteful.

Also, the original patches did not save the FPU state when handling
signals during the system call fast path.

We fix this by moving the FPCSR state to thread_struct in task_struct.
We also introduce new helper functions save_fpu and restore_fpu which
can be used to sync the FPU with thread_struct. These functions are now
called when needed:

- Setting up and restoring sigcontext when handling signals
- Before and after __switch_to during context switches
- When handling FPU exceptions
- When reading and writing FPU register sets

In the future we can further optimize this by doing lazy FPU save and
restore. For example, FPU sync is not needed when switching to and from
kernel threads (x86 does this). FPU save and restore does not need to
be done two times if we have both rescheduling and signal work to do.
However, since OpenRISC FPU state is a single register, I leave these
optimizations for future consideration.

Signed-off-by: Stafford Horne <[email protected]>

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openrisc: Use do_kernel_power_off()

After commit 14c5678720bd ("power: reset: syscon-poweroff: Use
devm_register_sys_off_handler(POWER_OFF)") setting up of pm_power_off
was removed from the driver,

openrisc: Use do_kernel_power_off()

After commit 14c5678720bd ("power: reset: syscon-poweroff: Use
devm_register_sys_off_handler(POWER_OFF)") setting up of pm_power_off
was removed from the driver, this causes OpenRISC platforms using
syscon-poweroff to no longer shutdown.

The kernel now supports chained power-off handlers. Use
do_kernel_power_off() that invokes chained power-off handlers. All
architectures have moved away from using pm_power_off except OpenRISC.

This patch migrates openrisc to use do_kernel_power_off() instead of the
legacy pm_power_off().

Fixes: 14c5678720bd ("power: reset: syscon-poweroff: Use devm_register_sys_off_handler(POWER_OFF)")
Signed-off-by: Stafford Horne <[email protected]>
Reviewed-by: Sebastian Reichel <[email protected]>

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openrisc: Include cpu.h and switch_to.h for prototypes

When compiling with W=1 enabling -Wmissing-prototypes the compiler
warns:

arch/openrisc/kernel/process.c:100:6: error: no previous prototype

openrisc: Include cpu.h and switch_to.h for prototypes

When compiling with W=1 enabling -Wmissing-prototypes the compiler
warns:

arch/openrisc/kernel/process.c:100:6: error: no previous prototype for 'arch_cpu_idle' [-Werror=missing-prototypes]
arch/openrisc/kernel/process.c:240:21: error: no previous prototype for '__switch_to' [-Werror=missing-prototypes]

Fix these by adding the approrpiate header files to process.c which
brings in the prototype definitions.

Reported-by: Arnd Bergmann <[email protected]>
Closes: https://lore.kernel.org/linux-kernel/[email protected]/
Signed-off-by: Stafford Horne <[email protected]>

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openrisc: Add prototype for show_registers to processor.h

When compiling with W=1 enabling -Wmissing-prototypes the compiler
warns:

arch/openrisc/kernel/traps.c:67:6: error: no previous prototype

openrisc: Add prototype for show_registers to processor.h

When compiling with W=1 enabling -Wmissing-prototypes the compiler
warns:

arch/openrisc/kernel/traps.c:67:6: error: no previous prototype for 'show_registers' [-Werror=missing-prototypes]

Fix by adding the prototype to the appropriate header file and including
the header file in the appropriate C files.

Reported-by: Arnd Bergmann <[email protected]>
Closes: https://lore.kernel.org/linux-kernel/[email protected]/
Signed-off-by: Stafford Horne <[email protected]>

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arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled

Current arch_cpu_idle() is called with IRQs disabled, but will return
with IRQs enabled.

However, the very first thing the

arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled

Current arch_cpu_idle() is called with IRQs disabled, but will return
with IRQs enabled.

However, the very first thing the generic code does after calling
arch_cpu_idle() is raw_local_irq_disable(). This means that
architectures that can idle with IRQs disabled end up doing a
pointless 'enable-disable' dance.

Therefore, push this IRQ disabling into the idle function, meaning
that those architectures can avoid the pointless IRQ state flipping.

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Tested-by: Tony Lindgren <[email protected]>
Tested-by: Ulf Hansson <[email protected]>
Reviewed-by: Gautham R. Shenoy <[email protected]>
Acked-by: Mark Rutland <[email protected]> [arm64]
Acked-by: Rafael J. Wysocki <[email protected]>
Acked-by: Guo Ren <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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kernel: exit: cleanup release_thread()

Only x86 has own release_thread(), introduce a new weak release_thread()
function to clean empty definitions in other ARCHs.

Link: https://lkml.kernel.org/r/2

kernel: exit: cleanup release_thread()

Only x86 has own release_thread(), introduce a new weak release_thread()
function to clean empty definitions in other ARCHs.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kefeng Wang <[email protected]>
Acked-by: Guo Ren <[email protected]> [csky]
Acked-by: Russell King (Oracle) <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Acked-by: Brian Cain <[email protected]>
Acked-by: Michael Ellerman <[email protected]> [powerpc]
Acked-by: Stafford Horne <[email protected]> [openrisc]
Acked-by: Catalin Marinas <[email protected]> [arm64]
Acked-by: Huacai Chen <[email protected]> [LoongArch]
Cc: Alexander Gordeev <[email protected]>
Cc: Anton Ivanov <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Guo Ren <[email protected]> [csky]
Cc: Heiko Carstens <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Jonas Bonn <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Stefan Kristiansson <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Vineet Gupta <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xuerui Wang <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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openrisc: Allow power off handler overriding

The OpenRISC platform always defines a default pm_power_off hanlder
which is only useful for simulators. Having this set also means power
management dri

openrisc: Allow power off handler overriding

The OpenRISC platform always defines a default pm_power_off hanlder
which is only useful for simulators. Having this set also means power
management drivers like syscon-power are not able to wire in their own
pm_power_off handlers.

Fix this by not setting the pm_power_off handler by default and fallback
to the simulator power off handler if no handler is set.

This has been tested with a new OpenRISC virt platform I am working on
for QEMU.

https://github.com/stffrdhrn/qemu/commits/or1k-virt

Cc: Jason A. Donenfeld <[email protected]>
Signed-off-by: Stafford Horne <[email protected]>

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openrisc: define nop command for simulator reboot

The simulator defines `l.nop 1` for shutdown, but doesn't have anything
for reboot. Use 13 for this, which is currently unused, dubbed
`NOP_REBOOT`.

openrisc: define nop command for simulator reboot

The simulator defines `l.nop 1` for shutdown, but doesn't have anything
for reboot. Use 13 for this, which is currently unused, dubbed
`NOP_REBOOT`.

Cc: Stafford Horne <[email protected]>
Cc: Peter Maydell <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Jason A. Donenfeld <[email protected]>
Signed-off-by: Stafford Horne <[email protected]>

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fork: Generalize PF_IO_WORKER handling

Add fn and fn_arg members into struct kernel_clone_args and test for
them in copy_thread (instead of testing for PF_KTHREAD | PF_IO_WORKER).
This allows any ta

fork: Generalize PF_IO_WORKER handling

Add fn and fn_arg members into struct kernel_clone_args and test for
them in copy_thread (instead of testing for PF_KTHREAD | PF_IO_WORKER).
This allows any task that wants to be a user space task that only runs
in kernel mode to use this functionality.

The code on x86 is an exception and still retains a PF_KTHREAD test
because x86 unlikely everything else handles kthreads slightly
differently than user space tasks that start with a function.

The functions that created tasks that start with a function
have been updated to set ".fn" and ".fn_arg" instead of
".stack" and ".stack_size". These functions are fork_idle(),
create_io_thread(), kernel_thread(), and user_mode_thread().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: "Eric W. Biederman" <[email protected]>

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fork: Pass struct kernel_clone_args into copy_thread

With io_uring we have started supporting tasks that are for most
purposes user space tasks that exclusively run code in kernel mode.

The kernel

fork: Pass struct kernel_clone_args into copy_thread

With io_uring we have started supporting tasks that are for most
purposes user space tasks that exclusively run code in kernel mode.

The kernel task that exec's init and tasks that exec user mode
helpers are also user mode tasks that just run kernel code
until they call kernel execve.

Pass kernel_clone_args into copy_thread so these oddball
tasks can be supported more cleanly and easily.

v2: Fix spelling of kenrel_clone_args on h8300
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: "Eric W. Biederman" <[email protected]>

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sched: Add wrapper for get_wchan() to keep task blocked

Having a stable wchan means the process must be blocked and for it to
stay that way while performing stack unwinding.

Suggested-by: Peter Zij

sched: Add wrapper for get_wchan() to keep task blocked

Having a stable wchan means the process must be blocked and for it to
stay that way while performing stack unwinding.

Suggested-by: Peter Zijlstra <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Acked-by: Russell King (Oracle) <[email protected]> [arm]
Tested-by: Mark Rutland <[email protected]> [arm64]
Link: https://lkml.kernel.org/r/[email protected]

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isystem: trim/fixup stdarg.h and other headers

Delete/fixup few includes in anticipation of global -isystem compile
option removal.

Note: crypto/aegis128-neon-inner.c keeps <stddef.h> due to redefi

isystem: trim/fixup stdarg.h and other headers

Delete/fixup few includes in anticipation of global -isystem compile
option removal.

Note: crypto/aegis128-neon-inner.c keeps <stddef.h> due to redefinition
of uintptr_t error (one definition comes from <stddef.h>, another from
<linux/types.h>).

Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

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arch: setup PF_IO_WORKER threads like PF_KTHREAD

PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the
sense that we don't assign ->set_child_tid with our own structure. Just
ensure

arch: setup PF_IO_WORKER threads like PF_KTHREAD

PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the
sense that we don't assign ->set_child_tid with our own structure. Just
ensure that every arch sets up the PF_IO_WORKER threads like kthreads
in the arch implementation of copy_thread().

Signed-off-by: Jens Axboe <[email protected]>

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openrisc: restart: Call common handlers before hanging

Currently openrisc will print a message and then hang in an infinite
loop when rebooting.

This patch adopts some code from ARM, which calls th

openrisc: restart: Call common handlers before hanging

Currently openrisc will print a message and then hang in an infinite
loop when rebooting.

This patch adopts some code from ARM, which calls the common restart
infrastructure and hangs after a small delay if the restart infra
doesn't do anything.

Signed-off-by: Joel Stanley <[email protected]>
Signed-off-by: Stafford Horne <[email protected]>

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sched/idle: Fix arch_cpu_idle() vs tracing

We call arch_cpu_idle() with RCU disabled, but then use
local_irq_{en,dis}able(), which invokes tracing, which relies on RCU.

Switch all arch_cpu_idle() i

sched/idle: Fix arch_cpu_idle() vs tracing

We call arch_cpu_idle() with RCU disabled, but then use
local_irq_{en,dis}able(), which invokes tracing, which relies on RCU.

Switch all arch_cpu_idle() implementations to use
raw_local_irq_{en,dis}able() and carefully manage the
lockdep,rcu,tracing state like we do in entry.

(XXX: we really should change arch_cpu_idle() to not return with
interrupts enabled)

Reported-by: Sven Schnelle <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Mark Rutland <[email protected]>
Tested-by: Mark Rutland <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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kill unused dump_fpu() instances

dump_fpu() is used only on the architectures that support elf
and have neither CORE_DUMP_USE_REGSET nor ELF_CORE_COPY_FPREGS
defined.

Currently that's csky, m68k, m

kill unused dump_fpu() instances

dump_fpu() is used only on the architectures that support elf
and have neither CORE_DUMP_USE_REGSET nor ELF_CORE_COPY_FPREGS
defined.

Currently that's csky, m68k, microblaze, nds32 and unicore32. The rest
of the instances are dead code.

NB: THIS MUST GO AFTER ELF_FDPIC CONVERSION

Signed-off-by: Al Viro <[email protected]>

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arch: rename copy_thread_tls() back to copy_thread()

Now that HAVE_COPY_THREAD_TLS has been removed, rename copy_thread_tls()
back simply copy_thread(). It's a simpler name, and doesn't imply that o

arch: rename copy_thread_tls() back to copy_thread()

Now that HAVE_COPY_THREAD_TLS has been removed, rename copy_thread_tls()
back simply copy_thread(). It's a simpler name, and doesn't imply that only
tls is copied here. This finishes an outstanding chunk of internal process
creation work since we've added clone3().

Cc: [email protected]
Acked-by: Thomas Bogendoerfer <[email protected]>A
Acked-by: Stafford Horne <[email protected]>
Acked-by: Greentime Hu <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>A
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

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mm: don't include asm/pgtable.h if linux/mm.h is already included

Patch series "mm: consolidate definitions of page table accessors", v2.

The low level page table accessors (pXY_index(), pXY_offset

mm: don't include asm/pgtable.h if linux/mm.h is already included

Patch series "mm: consolidate definitions of page table accessors", v2.

The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once. For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.

Most of these definitions are actually identical and typically it boils
down to, e.g.

static inline unsigned long pmd_index(unsigned long address)
{
return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}

static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}

These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.

For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.

These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.

This patch (of 12):

The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the
functions involving page table manipulations, e.g. pte_alloc() and
pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h>
in the files that include <linux/mm.h>.

The include statements in such cases are remove with a simple loop:

for f in $(git grep -l "include <linux/mm.h>") ; do
sed -i -e '/include <asm\/pgtable.h>/ d' $f
done

Signed-off-by: Mike Rapoport <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Cain <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Greentime Hu <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: Guan Xuetao <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Ley Foon Tan <[email protected]>
Cc: Mark Salter <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Nick Hu <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Russell King <[email protected]>
Cc: Stafford Horne <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Vincent Chen <[email protected]>
Cc: Vineet Gupta <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

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openrisc: Cleanup copy_thread_tls docs and comments

Previously copy_thread_tls was copy_thread and before that something
else. Remove the documentation about the regs parameter that didn't
exist in

openrisc: Cleanup copy_thread_tls docs and comments

Previously copy_thread_tls was copy_thread and before that something
else. Remove the documentation about the regs parameter that didn't
exist in either version.

Next, fix comment wrapping and details about how TLS pointer gets to the
copy_thread_tls function.

Signed-off-by: Stafford Horne <[email protected]>
Acked-by: Christian Brauner <[email protected]>

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openrisc: Convert copy_thread to copy_thread_tls

This is required for clone3 which passes the TLS value through a
struct rather than a register.

Signed-off-by: Stafford Horne <[email protected]>
Ack

openrisc: Convert copy_thread to copy_thread_tls

This is required for clone3 which passes the TLS value through a
struct rather than a register.

Signed-off-by: Stafford Horne <[email protected]>
Acked-by: Christian Brauner <[email protected]>

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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arch: remove unused macro/function thread_saved_pc()

The only user of thread_saved_pc() in non-arch-specific code was removed
in commit 8243d5597793 ("sched/core: Remove pointless printout in
sched_

arch: remove unused macro/function thread_saved_pc()

The only user of thread_saved_pc() in non-arch-specific code was removed
in commit 8243d5597793 ("sched/core: Remove pointless printout in
sched_show_task()"). Remove the implementations as well.

Some architectures use thread_saved_pc() in their arch-specific code.
Leave their thread_saved_pc() intact.

Signed-off-by: Tobias Klauser <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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kthread: fix boot hang (regression) on MIPS/OpenRISC

This fixes a regression in commit 4d6501dce079 where I didn't notice
that MIPS and OpenRISC were reinitialising p->{set,clear}_child_tid to
NULL

kthread: fix boot hang (regression) on MIPS/OpenRISC

This fixes a regression in commit 4d6501dce079 where I didn't notice
that MIPS and OpenRISC were reinitialising p->{set,clear}_child_tid to
NULL after our initialisation in copy_process().

We can simply get rid of the arch-specific initialisation here since it
is now always done in copy_process() before hitting copy_thread{,_tls}().

Review notes:

- As far as I can tell, copy_process() is the only user of
copy_thread_tls(), which is the only caller of copy_thread() for
architectures that don't implement copy_thread_tls().

- After this patch, there is no arch-specific code touching
p->set_child_tid or p->clear_child_tid whatsoever.

- It may look like MIPS/OpenRISC wanted to always have these fields be
NULL, but that's not true, as copy_process() would unconditionally
set them again _after_ calling copy_thread_tls() before commit
4d6501dce079.

Fixes: 4d6501dce079c1eb6bf0b1d8f528a5e81770109e ("kthread: Fix use-after-free if kthread fork fails")
Reported-by: Guenter Roeck <[email protected]>
Tested-by: Guenter Roeck <[email protected]> # MIPS only
Acked-by: Stafford Horne <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: [email protected]
Cc: Jonas Bonn <[email protected]>
Cc: Stefan Kristiansson <[email protected]>
Cc: [email protected]
Cc: Jamie Iles <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Vegard Nossum <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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openrisc: Switch to use export.h instead of module.h

Reduce dependencies on module.h since all we need here is export.h
for EXPORT_SYMBOL.

Fixes: f50169324df4 ("module.h: split out the EXPORT_SYMBO

openrisc: Switch to use export.h instead of module.h

Reduce dependencies on module.h since all we need here is export.h
for EXPORT_SYMBOL.

Fixes: f50169324df4 ("module.h: split out the EXPORT_SYMBOL into export.h")
Signed-off-by: Stafford Horne <[email protected]>

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openrisc: Export symbols needed by modules

This was detected by allmodconfig, errors reported:

ERROR: "empty_zero_page" [net/ceph/libceph.ko] undefined!
ERROR: "__ucmpdi2" [lib/842/842_decompress

openrisc: Export symbols needed by modules

This was detected by allmodconfig, errors reported:

ERROR: "empty_zero_page" [net/ceph/libceph.ko] undefined!
ERROR: "__ucmpdi2" [lib/842/842_decompress.ko] undefined!
ERROR: "empty_zero_page" [fs/nfs/objlayout/objlayoutdriver.ko] undefined!
ERROR: "empty_zero_page" [fs/exofs/exofs.ko] undefined!
ERROR: "empty_zero_page" [fs/crypto/fscrypto.ko] undefined!
ERROR: "__ucmpdi2" [fs/btrfs/btrfs.ko] undefined!
ERROR: "pm_power_off" [drivers/regulator/act8865-regulator.ko] undefined!
ERROR: "__ucmpdi2" [drivers/media/i2c/adv7842.ko] undefined!
ERROR: "__clear_user" [drivers/md/dm-mod.ko] undefined!
ERROR: "__clear_user" [net/netfilter/x_tables.ko] undefined!

Signed-off-by: Stafford Horne <[email protected]>

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