asm-generic: introduce text-patching.h

Several architectures support text patching, but they name the header
files that declare patching functions differently.

Make all such headers consistently na

asm-generic: introduce text-patching.h

Several architectures support text patching, but they name the header
files that declare patching functions differently.

Make all such headers consistently named text-patching.h and add an empty
header in asm-generic for architectures that do not support text patching.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport (Microsoft) <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]> # m68k
Acked-by: Arnd Bergmann <[email protected]>
Reviewed-by: Luis Chamberlain <[email protected]>
Tested-by: kdevops <[email protected]>
Cc: Andreas Larsson <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Borislav Petkov (AMD) <[email protected]>
Cc: Brian Cain <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: John Paul Adrian Glaubitz <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masami Hiramatsu (Google) <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Russell King <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Stafford Horne <[email protected]>
Cc: Steven Rostedt (Google) <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Uladzislau Rezki (Sony) <[email protected]>
Cc: Vineet Gupta <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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mips: remove <asm/export.h>

All *.S files under arch/mips/ have been converted to include
<linux/export.h> instead of <asm/export.h>.

Remove <asm/export.h>.

Signed-off-by: Masahiro Yamada <masahir

mips: remove <asm/export.h>

All *.S files under arch/mips/ have been converted to include
<linux/export.h> instead of <asm/export.h>.

Remove <asm/export.h>.

Signed-off-by: Masahiro Yamada <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

show more ...

mips: syscalls: switch to generic syscalltbl.sh

Many architectures duplicate similar shell scripts.

This commit converts mips to use scripts/syscalltbl.sh. This also
unifies syscall_table_32_o32.h

mips: syscalls: switch to generic syscalltbl.sh

Many architectures duplicate similar shell scripts.

This commit converts mips to use scripts/syscalltbl.sh. This also
unifies syscall_table_32_o32.h and syscall_table_64_o32.h into
syscall_table_o32.h.

The offset parameters are unneeded here; __SYSCALL(nr, entry) is defined
as 'PTR entry', so the parameter 'nr' is not used in the first place.

With this commit, syscall tables and generated files are straight
mapped, which makes things easier to understand.

syscall_n32.tbl --> syscall_table_n32.h
syscall_n64.tbl --> syscall_table_n64.h
syscall_o32.tbl --> syscall_table_o32.h

Then, the abi parameters are also unneeded.

Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

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MIPS: UAPI: unexport unistd_nr_{n32,n64,o32}.h

unistd_nr_{n32,n64,o32}.h are needed only by include/asm/unistd.h,
which is a kernel-side header file, and their contents is generally
not for userland

MIPS: UAPI: unexport unistd_nr_{n32,n64,o32}.h

unistd_nr_{n32,n64,o32}.h are needed only by include/asm/unistd.h,
which is a kernel-side header file, and their contents is generally
not for userland use.
Move their target destination from include/generated/uapi/asm/ to
include/generated/asm/ to disable exporting them as UAPI headers.

Signed-off-by: Alexander Lobakin <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

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local64.h: make <asm/local64.h> mandatory

Make <asm-generic/local64.h> mandatory in include/asm-generic/Kbuild and
remove all arch/*/include/asm/local64.h arch-specific files since they
only #includ

local64.h: make <asm/local64.h> mandatory

Make <asm-generic/local64.h> mandatory in include/asm-generic/Kbuild and
remove all arch/*/include/asm/local64.h arch-specific files since they
only #include <asm-generic/local64.h>.

This fixes build errors on arch/c6x/ and arch/nios2/ for
block/blk-iocost.c.

Build-tested on 21 of 25 arch-es. (tools problems on the others)

Yes, we could even rename <asm-generic/local64.h> to
<linux/local64.h> and change all #includes to use
<linux/local64.h> instead.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Randy Dunlap <[email protected]>
Suggested-by: Christoph Hellwig <[email protected]>
Reviewed-by: Masahiro Yamada <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Ley Foon Tan <[email protected]>
Cc: Mark Salter <[email protected]>
Cc: Aurelien Jacquiot <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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MIPS: Retire kvm paravirt

paravirt machine was introduced for Cavium's partial virtualization
technology, however, it's host side support and QEMU support never
landed in upstream.

As Cavium was ac

MIPS: Retire kvm paravirt

paravirt machine was introduced for Cavium's partial virtualization
technology, however, it's host side support and QEMU support never
landed in upstream.

As Cavium was acquired by Marvel and they have no intention to maintain
their MIPS product line, also paravirt is unlikely to be utilized by
community users, it's time to retire it if nobody steps in to maintain
it.

Signed-off-by: Jiaxun Yang <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

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KVM: MIPS: Use common KVM implementation of MMU memory caches

Move to the common MMU memory cache implementation now that the common
code and MIPS's existing code are semantically compatible.

No fu

KVM: MIPS: Use common KVM implementation of MMU memory caches

Move to the common MMU memory cache implementation now that the common
code and MIPS's existing code are semantically compatible.

No functional change intended.

Suggested-by: Christoffer Dall <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

show more ...

KVM: Move x86's version of struct kvm_mmu_memory_cache to common code

Move x86's 'struct kvm_mmu_memory_cache' to common code in anticipation
of moving the entire x86 implementation code to common K

KVM: Move x86's version of struct kvm_mmu_memory_cache to common code

Move x86's 'struct kvm_mmu_memory_cache' to common code in anticipation
of moving the entire x86 implementation code to common KVM and reusing
it for arm64 and MIPS. Add a new architecture specific asm/kvm_types.h
to control the existence and parameters of the struct. The new header
is needed to avoid a chicken-and-egg problem with asm/kvm_host.h as all
architectures define instances of the struct in their vCPU structs.

Add an asm-generic version of kvm_types.h to avoid having empty files on
PPC and s390 in the long term, and for arm64 and mips in the short term.

Suggested-by: Christoffer Dall <[email protected]>
Reviewed-by: Ben Gardon <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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asm-generic: make more kernel-space headers mandatory

Change a header to mandatory-y if both of the following are met:

[1] At least one architecture (except um) specifies it as generic-y in
arc

asm-generic: make more kernel-space headers mandatory

Change a header to mandatory-y if both of the following are met:

[1] At least one architecture (except um) specifies it as generic-y in
arch/*/include/asm/Kbuild

[2] Every architecture (except um) either has its own implementation
(arch/*/include/asm/*.h) or specifies it as generic-y in
arch/*/include/asm/Kbuild

This commit was generated by the following shell script.

----------------------------------->8-----------------------------------

arches=$(cd arch; ls -1 | sed -e '/Kconfig/d' -e '/um/d')

tmpfile=$(mktemp)

grep "^mandatory-y +=" include/asm-generic/Kbuild > $tmpfile

find arch -path 'arch/*/include/asm/Kbuild' |
xargs sed -n 's/^generic-y += \(.*\)/\1/p' | sort -u |
while read header
do
mandatory=yes

for arch in $arches
do
if ! grep -q "generic-y += $header" arch/$arch/include/asm/Kbuild &&
! [ -f arch/$arch/include/asm/$header ]; then
mandatory=no
break
fi
done

if [ "$mandatory" = yes ]; then
echo "mandatory-y += $header" >> $tmpfile

for arch in $arches
do
sed -i "/generic-y += $header/d" arch/$arch/include/asm/Kbuild
done
fi

done

sed -i '/^mandatory-y +=/d' include/asm-generic/Kbuild

LANG=C sort $tmpfile >> include/asm-generic/Kbuild

----------------------------------->8-----------------------------------

One obvious benefit is the diff stat:

25 files changed, 52 insertions(+), 557 deletions(-)

It is tedious to list generic-y for each arch that needs it.

So, mandatory-y works like a fallback default (by just wrapping
asm-generic one) when arch does not have a specific header
implementation.

See the following commits:

def3f7cefe4e81c296090e1722a76551142c227c
a1b39bae16a62ce4aae02d958224f19316d98b24

It is tedious to convert headers one by one, so I processed by a shell
script.

Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

show more ...

asm-generic: Make dma-contiguous.h a mandatory include/asm header

dma-continuguous.h is generic for all architectures except arm32 which has
its own version.

Similar change was done for msi.h by co

asm-generic: Make dma-contiguous.h a mandatory include/asm header

dma-continuguous.h is generic for all architectures except arm32 which has
its own version.

Similar change was done for msi.h by commit a1b39bae16a6
("asm-generic: Make msi.h a mandatory include/asm header")

Suggested-by: Christoph Hellwig <[email protected]>
Link: https://lore.kernel.org/linux-arm-kernel/[email protected]/T/#m92bb56b04161057635d4142e1b3b9b6b0a70122e
Signed-off-by: Michal Simek <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Paul Walmsley <[email protected]> # for arch/riscv

show more ...

Revert "MIPS: Add custom serial.h with BASE_BAUD override for generic kernel"

This reverts commit c8ec2041f549e7f2dee0c34d25381be6f7805f99.

There's no more need to set BASE_BAUD to 0 to make earlyc

Revert "MIPS: Add custom serial.h with BASE_BAUD override for generic kernel"

This reverts commit c8ec2041f549e7f2dee0c34d25381be6f7805f99.

There's no more need to set BASE_BAUD to 0 to make earlycon work
properly on DTS-based boards since such cases were handled in commit
182ead3e418a ("earlycon: Remove hardcoded port->uartclk initialization
in of_setup_earlycon"). earlycon no longer initializes port->uartclk
with a value of BASE_BAUD * 16 when starting from FDT/OF.

Signed-off-by: Alexander Lobakin <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Microchip Linux Driver Support <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Allison Randal <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: [email protected]
Cc: [email protected]

show more ...

asm-generic: Make msi.h a mandatory include/asm header

msi.h is generic for all architectures except x86, which has its own
version. Enabling MSI by adding msi.h to every architecture's Kbuild is
j

asm-generic: Make msi.h a mandatory include/asm header

msi.h is generic for all architectures except x86, which has its own
version. Enabling MSI by adding msi.h to every architecture's Kbuild is
just an additional step which doesn't need to be done.

Make msi.h mandatory in the asm-generic/Kbuild so we don't have to do it
for each architecture.

Suggested-by: Christoph Hellwig <[email protected]>
Link: https://lore.kernel.org/r/c991669e29a79b1a8e28c3b4b3a125801a693de8.1571983829.git.michal.simek@xilinx.com
Tested-by: Paul Walmsley <[email protected]> # build only, rv32/rv64
Signed-off-by: Michal Simek <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Masahiro Yamada <[email protected]>
Acked-by: Waiman Long <[email protected]>
Acked-by: Paul Walmsley <[email protected]> # arch/riscv

show more ...

treewide: Add SPDX license identifier - Kbuild

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license,

treewide: Add SPDX license identifier - Kbuild

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0

Reported-by: Masahiro Yamada <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kate Stewart <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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arch: mostly remove <asm/segment.h>

A few architectures use <asm/segment.h> internally, but nothing in
common code does. Remove all the empty or almost empty versions of it,
including the asm-generi

arch: mostly remove <asm/segment.h>

A few architectures use <asm/segment.h> internally, but nothing in
common code does. Remove all the empty or almost empty versions of it,
including the asm-generic one.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

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mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()

The mmiowb() macro is horribly difficult to use and drivers will continue
to work most of the time if they omit a call when it is requir

mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()

The mmiowb() macro is horribly difficult to use and drivers will continue
to work most of the time if they omit a call when it is required.

Rather than rely on driver authors getting this right, push mmiowb() into
arch_spin_unlock() for mips. If this is deemed to be a performance issue,
a subsequent optimisation could make use of ARCH_HAS_MMIOWB to elide
the barrier in cases where no I/O writes were performed inside the
critical section.

Acked-by: Paul Burton <[email protected]>
Acked-by: Linus Torvalds <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

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arch: Use asm-generic header for asm/mmiowb.h

Hook up asm-generic/mmiowb.h to Kbuild for all architectures so that we
can subsequently include asm/mmiowb.h from core code.

Cc: Masahiro Yamada <yama

arch: Use asm-generic header for asm/mmiowb.h

Hook up asm-generic/mmiowb.h to Kbuild for all architectures so that we
can subsequently include asm/mmiowb.h from core code.

Cc: Masahiro Yamada <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Acked-by: Linus Torvalds <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

show more ...

MIPS: remove meaningless generic-(CONFIG_GENERIC_CSUM) += checksum.h

This line is weird in multiple ways.

(CONFIG_GENERIC_CSUM) might be a typo of $(CONFIG_GENERIC_CSUM).

Even if you add '$' to it

MIPS: remove meaningless generic-(CONFIG_GENERIC_CSUM) += checksum.h

This line is weird in multiple ways.

(CONFIG_GENERIC_CSUM) might be a typo of $(CONFIG_GENERIC_CSUM).

Even if you add '$' to it, $(CONFIG_GENERIC_CSUM) is never evaluated
to 'y' because scripts/Makefile.asm-generic does not include
include/config/auto.conf. So, the asm-generic wrapper of checksum.h
is never generated.

Even if you manage to generate it, it is never included by anyone
because MIPS has the checkin header with the same file name:

arch/mips/include/asm/checksum.h

As you see in the top Makefile, the checkin headers are included before
generated ones.

LINUXINCLUDE := \
-I$(srctree)/arch/$(SRCARCH)/include \
-I$(objtree)/arch/$(SRCARCH)/include/generated \
...

Commit 4e0748f5beb9 ("MIPS: Use generic checksum functions for MIPS R6")
already added the asm-generic fallback code in the checkin header:

#ifdef CONFIG_GENERIC_CSUM
#include <asm/generic/checksum.h>
#else
...
#endif

Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: [email protected]

show more ...

mips: generate uapi header and system call table files

System call table generation script must be run to gener-
ate unistd_(nr_)n64/n32/o32.h and syscall_table_32_o32/
64_n64/64_n32/64-o32.h files.

mips: generate uapi header and system call table files

System call table generation script must be run to gener-
ate unistd_(nr_)n64/n32/o32.h and syscall_table_32_o32/
64_n64/64_n32/64-o32.h files. This patch will have changes
which will invokes the script.

This patch will generate unistd_(nr_)n64/n32/o32.h and
syscall_table_32_o32/64_n64/64-n32/64-o32.h files by the
syscall table generation script invoked by parisc/Make-
file and the generated files against the removed files
must be identical.

The generated uapi header file will be included in uapi/-
asm/unistd.h and generated system call table header file
will be included by kernel/scall32-o32/64-n64/64-n32/-
64-o32.Sfile.

Signed-off-by: Firoz Khan <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Philippe Ombredanne <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Kate Stewart <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

show more ...

dma-mapping: move the dma_coherent flag to struct device

Various architectures support both coherent and non-coherent dma on a
per-device basis. Move the dma_noncoherent flag from the mips archdata

dma-mapping: move the dma_coherent flag to struct device

Various architectures support both coherent and non-coherent dma on a
per-device basis. Move the dma_noncoherent flag from the mips archdata
field to struct device proper to prepare the infrastructure for reuse on
other architectures.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Paul Burton <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>

show more ...

mips: use asm-generic version of msi.h

This is necessary to be able to include <linux/msi.h> when
CONFIG_GENERIC_MSI_IRQ_DOMAIN is enabled. Without this, a build with
CONFIG_GENERIC_MSI_IRQ_DOMAIN f

mips: use asm-generic version of msi.h

This is necessary to be able to include <linux/msi.h> when
CONFIG_GENERIC_MSI_IRQ_DOMAIN is enabled. Without this, a build with
CONFIG_GENERIC_MSI_IRQ_DOMAIN fails with:

In file included from include/linux/kvm_host.h:20:0,
from arch/mips/kernel/asm-offsets.c:24:
>> include/linux/msi.h:197:10: fatal error: asm/msi.h: No such file or directory
#include <asm/msi.h>
^~~~~~~~~~~
compilation terminated.
make[2]: *** [arch/mips/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [sub-make] Error 2

Signed-off-by: Thomas Petazzoni <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/19986/
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Marc Zyngier <[email protected]>
Cc: Hanna Hawa <[email protected]>

show more ...

arch: Remove clkdev.h asm-generic from Kbuild

Now that every architecture is using the generic clkdev.h file
and we no longer include asm/clkdev.h anywhere in the tree, we
can remove it.

Cc: Russel

arch: Remove clkdev.h asm-generic from Kbuild

Now that every architecture is using the generic clkdev.h file
and we no longer include asm/clkdev.h anywhere in the tree, we
can remove it.

Cc: Russell King <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Cc: <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]> [m68k]
Signed-off-by: Stephen Boyd <[email protected]>

show more ...

MIPS: Add custom serial.h with BASE_BAUD override for generic kernel

Add a custom serial.h header for MIPS, allowing platforms to override
the asm-generic version if required.

The generic platform

MIPS: Add custom serial.h with BASE_BAUD override for generic kernel

Add a custom serial.h header for MIPS, allowing platforms to override
the asm-generic version if required.

The generic platform uses this header to set BASE_BAUD to 0. The
generic platform supports multiple boards, which may have different
UART clocks. Also one of the boards supported is the Boston FPGA board,
where the UART clock depends on the loaded FPGA bitfile. As such there
is no way that the generic kernel can set a compile time default
BASE_BAUD.

Commit 31cb9a8575ca ("earlycon: initialise baud field of earlycon device
structure") changed the behavior of of_setup_earlycon such that any baud
rate set in the device tree is now set in the earlycon structure. The
UART driver will then calculate a divisor based on BASE_BAUD and set it.
With MIPS generic kernels this resulted in garbage output due to the
incorrect uart clock rate being used to calculate a divisor. This
commit, combined with "serial: 8250_early: Only set divisor if valid clk
& baud" prevents the earlycon code setting a bad divisor and restores
earlycon output.

Fixes: 31cb9a8575ca ("earlycon: initialise baud field of earlycon device structure")
Cc: stable <[email protected]> # 4.14
Signed-off-by: Matt Redfearn <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

show more ...

MIPS: Use queued spinlocks (qspinlock)

This patch switches MIPS to make use of generically implemented queued
spinlocks, rather than the ticket spinlocks used previously. This allows
us to drop a wh

MIPS: Use queued spinlocks (qspinlock)

This patch switches MIPS to make use of generically implemented queued
spinlocks, rather than the ticket spinlocks used previously. This allows
us to drop a whole load of inline assembly, share more generic code, and
is also a performance win.

Results from running the AIM7 short workload on a MIPS Creator Ci40 (ie.
2 core 2 thread interAptiv CPU clocked at 546MHz) with v4.12-rc4
pistachio_defconfig, with ftrace disabled due to a current bug, and both
with & without use of queued rwlocks & spinlocks:

Forks | v4.12-rc4 | +qlocks | Change
-------|-----------|----------|--------
10 | 52630.32 | 53316.31 | +1.01%
20 | 51777.80 | 52623.15 | +1.02%
30 | 51645.92 | 52517.26 | +1.02%
40 | 51634.88 | 52419.89 | +1.02%
50 | 51506.75 | 52307.81 | +1.02%
60 | 51500.74 | 52322.72 | +1.02%
70 | 51434.81 | 52288.60 | +1.02%
80 | 51423.22 | 52434.85 | +1.02%
90 | 51428.65 | 52410.10 | +1.02%

The kernels used for these tests also had my "MIPS: Hardcode cpu_has_*
where known at compile time due to ISA" patch applied, which allows the
kernel_uses_llsc checks in cmpxchg() & xchg() to be optimised away at
compile time.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/16358/
Signed-off-by: Ralf Baechle <[email protected]>

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MIPS: Use queued read/write locks (qrwlock)

This patch switches MIPS to make use of generically implemented queued
read/write locks, rather than the custom implementation used previously.
This allow

MIPS: Use queued read/write locks (qrwlock)

This patch switches MIPS to make use of generically implemented queued
read/write locks, rather than the custom implementation used previously.
This allows us to drop a whole load of inline assembly, share more
generic code, and is also a performance win.

Results from running the AIM7 short workload on a MIPS Creator Ci40 (ie.
2 core 2 thread interAptiv CPU clocked at 546MHz) with v4.12-rc4
pistachio_defconfig, with ftrace disabled due to a current bug, and both
with & without use of queued rwlocks & spinlocks:

Forks | v4.12-rc4 | +qlocks | Change
-------|-----------|----------|--------
10 | 52630.32 | 53316.31 | +1.01%
20 | 51777.80 | 52623.15 | +1.02%
30 | 51645.92 | 52517.26 | +1.02%
40 | 51634.88 | 52419.89 | +1.02%
50 | 51506.75 | 52307.81 | +1.02%
60 | 51500.74 | 52322.72 | +1.02%
70 | 51434.81 | 52288.60 | +1.02%
80 | 51423.22 | 52434.85 | +1.02%
90 | 51428.65 | 52410.10 | +1.02%

The kernels used for these tests also had my "MIPS: Hardcode cpu_has_*
where known at compile time due to ISA" patch applied, which allows the
kernel_uses_llsc checks in cmpxchg() & xchg() to be optimised away at
compile time.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/16357/
Signed-off-by: Ralf Baechle <[email protected]>

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sched/cputime: Remove generic asm headers

cputime_t is now only used by two architectures:

* powerpc (when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y)
* s390

And since the core doesn't use it anymore,

sched/cputime: Remove generic asm headers

cputime_t is now only used by two architectures:

* powerpc (when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y)
* s390

And since the core doesn't use it anymore, we don't need any arch support
from the others. So we can remove their stub implementations.

A final cleanup would be to provide an efficient pure arch
implementation of cputime_to_nsec() for s390 and powerpc and finally
remove include/linux/cputime.h .

Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Wanpeng Li <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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