linux-toradex.git/arch/powerpc/Makefile, branch v4.14

Merge branch 'fixes' into next

2017-08-23T12:20:10+00:00

There's a non-trivial dependency between some commits we want to put in
next and the KVM prefetch work around that went into fixes. So merge
fixes into next.

powerpc/8xx: Getting rid of remaining use of CONFIG_8xx

2017-08-10T13:32:12+00:00

Two config options exist to define powerpc MPC8xx:
* CONFIG_PPC_8xx
* CONFIG_8xx

arch/powerpc/platforms/Kconfig.cputype has contained the following
comment about CONFIG_8xx item for some years:
"# this is temp to handle compat with arch=ppc"

arch/powerpc is now the only place with remaining use of
CONFIG_8xx: get rid of them.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman

powerpc/configs: Add a powernv_be_defconfig

2017-07-31T06:56:37+00:00

Although pretty much everyone using powernv is running little endian,
we should still test we can build for big endian. So add a
powernv_be_defconfig, which is autogenerated by flipping the endian
symbol in powernv_defconfig.

Signed-off-by: Michael Ellerman 
Reviewed-by: Cyril Bur

powerpc/Makefile: Fix ld version check with 64-bit LE-only toolchain

2017-07-26T06:41:54+00:00

In commit efe0160cfd40 ("powerpc/64: Linker on-demand sfpr functions
for modules"), we added an ld version check early in the powerpc
top-level Makefile.

Because the Makefile runs before the kernel config is setup, the
checks for CONFIG_CPU_LITTLE_ENDIAN etc. all take the default case. So
we end up configuring ld for 32-bit big endian.

That would be OK, except that for historical (or perhaps no) reason,
we use 'override LD' to add the endian flags to the LD variable
itself, rather than the normal approach of adding them to LDFLAGS.

The end result is that when we check the ld version we run it as:

  $(CROSS_COMPILE)ld -EB -m elf32ppc --version

This often works, unless you are using a 64-bit only and/or little
endian only, toolchain. In which case you see something like:

  $ make defconfig
  powerpc64le-linux-ld: unrecognised emulation mode: elf32ppc
  Supported emulations: elf64lppc elf32lppc elf32lppclinux elf32lppcsim
  /bin/sh: 1: [: -ge: unexpected operator

The proper fix is to stop using 'override LD', but that will require a
fair bit of testing. Instead we can fix it for now just by reordering
the Makefile to do the version check earlier.

Fixes: efe0160cfd40 ("powerpc/64: Linker on-demand sfpr functions for modules")
Signed-off-by: Michael Ellerman

powerpc: Link warning for orphan sections

2017-05-30T04:59:51+00:00

Add --orphan-handling=warn to final link flags. This ensures we can
handle all sections explicitly. This would have caught subtle breakage
such as 7de3b27bac47da9de08409df1d69664acbb72197 at build-time.

Also bring existing orphan sections into the fold:
- .text.hot and .text.unlikely are compiler generated sections.
- .sdata2, .dynsbss, .plt are used by PPC32
- We previously did not specify DWARF_DEBUG or STABS_DEBUG
- DWARF_DEBUG did not include all DWARF sections that can be emitted
- A number of sections are unused and can be discarded.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc/64: Linker on-demand sfpr functions for modules

2017-05-30T04:59:51+00:00

For final link, the powerpc64 linker generates fpr save/restore
functions on-demand, placing them in the .sfpr section. Starting with
binutils 2.25, these can be provided for non-final links with
--save-restore-funcs. Use that where possible for module links.

This saves about 200 bytes per module (~60kB) on powernv defconfig
build.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc: Add arch/powerpc/tools directory

2017-04-28T11:26:53+00:00

Move a couple of existing scripts under there. Remove scripts directory:
a script is a tool, a tool is not a script.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc: Use the new post-link pass to check relocations

2017-04-28T11:26:52+00:00

Currently powerpc has to introduce a dependency on its default build
target zImage in order to run a relocation check pass over the linked
vmlinux. This is deficient because the check is not run if the plain
vmlinux target is built, or if one of the other boot targets is built.

Switch to using the kbuild post-link pass, added in commit fbe6e37dab97
("kbuild: add arch specific post-link Makefile") in order to run this
check. In future powerpc will use this to do more complicated operations,
but initially using it for something simple is a good first step.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc: Fix compiling a BE kernel with a powerpc64le toolchain

2017-03-03T00:24:50+00:00

GCC can compile with either endian, but the default ABI version is set
based on the default endianness of the toolchain. Alan Modra says:

  you need both -mbig and -mabi=elfv1 to make a powerpc64le gcc
  generate powerpc64 code

The opposite is true for powerpc64 when generating -mlittle it
requires -mabi=elfv2 to generate v2 ABI, which we were already doing.

This change adds ABI annotations together with endianness for all cases,
LE and BE. This fixes the case of building a BE kernel with a toolchain
that is LE by default.

Signed-off-by: Nicholas Piggin 
Tested-by: Naveen N. Rao 
Signed-off-by: Michael Ellerman

powerpc: Add purgatory for kexec_file_load() implementation.

2016-11-30T12:15:26+00:00

This purgatory implementation is based on the versions from kexec-tools
and kexec-lite, with additional changes.

Signed-off-by: Thiago Jung Bauermann 
Signed-off-by: Michael Ellerman