linux.git/arch/parisc/Makefile, branch v5.5

module/ftrace: handle patchable-function-entry

2019-11-06T14:17:30+00:00

When using patchable-function-entry, the compiler will record the
callsites into a section named "__patchable_function_entries" rather
than "__mcount_loc". Let's abstract this difference behind a new
FTRACE_CALLSITE_SECTION, so that architectures don't have to handle this
explicitly (e.g. with custom module linker scripts).

As parisc currently handles this explicitly, it is fixed up accordingly,
with its custom linker script removed. Since FTRACE_CALLSITE_SECTION is
only defined when DYNAMIC_FTRACE is selected, the parisc module loading
code is updated to only use the definition in that case. When
DYNAMIC_FTRACE is not selected, modules shouldn't have this section, so
this removes some redundant work in that case.

To make sure that this is keep up-to-date for modules and the main
kernel, a comment is added to vmlinux.lds.h, with the existing ifdeffery
simplified for legibility.

I built parisc generic-{32,64}bit_defconfig with DYNAMIC_FTRACE enabled,
and verified that the section made it into the .ko files for modules.

Signed-off-by: Mark Rutland 
Acked-by: Helge Deller 
Acked-by: Steven Rostedt (VMware) 
Reviewed-by: Ard Biesheuvel 
Reviewed-by: Torsten Duwe 
Tested-by: Amit Daniel Kachhap 
Tested-by: Sven Schnelle 
Tested-by: Torsten Duwe 
Cc: Ingo Molnar 
Cc: James E.J. Bottomley 
Cc: Jessica Yu 
Cc: linux-parisc@vger.kernel.org

kbuild: rebuild modules when module linker scripts are updated

2019-08-21T12:05:21+00:00

Currently, the timestamp of module linker scripts are not checked.
Add them to the dependency of modules so they are correctly rebuilt.

Signed-off-by: Masahiro Yamada

parisc: Add archclean Makefile target

2019-08-01T12:20:55+00:00

Apparently we don't have an archclean target in our
arch/parisc/Makefile, so files in there never get cleaned out by make
mrproper.  This, in turn means that the sizes.h file in
arch/parisc/boot/compressed never gets removed and worse, when you
transition to an O=build/parisc[64] build model it overrides the
generated file.  The upshot being my bzImage was building with a SZ_end
that was too small.

I fixed it by making mrproper clean everything.

Signed-off-by: James Bottomley 
Cc: stable@vger.kernel.org # v4.20+
Signed-off-by: Helge Deller

parisc: rename default_defconfig to defconfig

2019-07-31T14:18:18+00:00

'default_defconfig' is an awkward name since 'defconfig' is the default.
Let's simply say 'defconfig' like other architectures. You can drop the
KBUILD_DEFCONFIG define by following the standard naming.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Helge Deller

Merge tag 'kbuild-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2019-07-12T23:03:16+00:00

Pull Kbuild updates from Masahiro Yamada:

 - remove headers_{install,check}_all targets

 - remove unreasonable 'depends on !UML' from CONFIG_SAMPLES

 - re-implement 'make headers_install' more cleanly

 - add new header-test-y syntax to compile-test headers

 - compile-test exported headers to ensure they are compilable in
   user-space

 - compile-test headers under include/ to ensure they are self-contained

 - remove -Waggregate-return, -Wno-uninitialized, -Wno-unused-value
   flags

 - add -Werror=unknown-warning-option for Clang

 - add 128-bit built-in types support to genksyms

 - fix missed rebuild of modules.builtin

 - propagate 'No space left on device' error in fixdep to Make

 - allow Clang to use its integrated assembler

 - improve some coccinelle scripts

 - add a new flag KBUILD_ABS_SRCTREE to request Kbuild to use absolute
   path for $(srctree).

 - do not ignore errors when compression utility is missing

 - misc cleanups

* tag 'kbuild-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (49 commits)
  kbuild: use -- separater intead of $(filter-out ...) for cc-cross-prefix
  kbuild: Inform user to pass ARCH= for make mrproper
  kbuild: fix compression errors getting ignored
  kbuild: add a flag to force absolute path for srctree
  kbuild: replace KBUILD_SRCTREE with boolean building_out_of_srctree
  kbuild: remove src and obj from the top Makefile
  scripts/tags.sh: remove unused environment variables from comments
  scripts/tags.sh: drop SUBARCH support for ARM
  kbuild: compile-test kernel headers to ensure they are self-contained
  kheaders: include only headers into kheaders_data.tar.xz
  kheaders: remove meaningless -R option of 'ls'
  kbuild: support header-test-pattern-y
  kbuild: do not create wrappers for header-test-y
  kbuild: compile-test exported headers to ensure they are self-contained
  init/Kconfig: add CONFIG_CC_CAN_LINK
  kallsyms: exclude kasan local symbols on s390
  kbuild: add more hints about SUBDIRS replacement
  coccinelle: api/stream_open: treat all wait_.*() calls as blocking
  coccinelle: put_device: Add a cast to an expression for an assignment
  coccinelle: put_device: Adjust a message construction
  ...

kbuild: remove src and obj from the top Makefile

2019-07-10T15:05:09+00:00

Replace $(src) and $(obj) with $(srctree) and $(objtree), respectively.

Signed-off-by: Masahiro Yamada

parisc: add dynamic ftrace

2019-06-08T10:56:29+00:00

This patch implements dynamic ftrace for PA-RISC. The required mcount
call sequences can get pretty long, so instead of patching the
whole call sequence out of the functions, we are using
-fpatchable-function-entry from gcc. This puts a configurable amount of
NOPS before/at the start of the function. Taking do_sys_open() as example,
which would look like this when the call is patched out:

1036b248:       08 00 02 40     nop
1036b24c:       08 00 02 40     nop
1036b250:       08 00 02 40     nop
1036b254:       08 00 02 40     nop

1036b258 :
1036b258:       08 00 02 40     nop
1036b25c:       08 03 02 41     copy r3,r1
1036b260:       6b c2 3f d9     stw rp,-14(sp)
1036b264:       08 1e 02 43     copy sp,r3
1036b268:       6f c1 01 00     stw,ma r1,80(sp)

When ftrace gets enabled for this function the kernel will patch these
NOPs to:

1036b248:       10 19 57 20     
1036b24c:       6f c1 00 80     stw,ma r1,40(sp)
1036b250:       48 21 3f d1     ldw -18(r1),r1
1036b254:       e8 20 c0 02     bv,n r0(r1)

1036b258 :
1036b258:       e8 3f 1f df     b,l,n .-c,r1
1036b25c:       08 03 02 41     copy r3,r1
1036b260:       6b c2 3f d9     stw rp,-14(sp)
1036b264:       08 1e 02 43     copy sp,r3
1036b268:       6f c1 01 00     stw,ma r1,80(sp)

So the first NOP in do_sys_open() will be patched to jump backwards into
some minimal trampoline code which pushes a stackframe, saves r1 which
holds the return address, loads the address of the real ftrace function,
and branches to that location. For 64 Bit things are getting a bit more
complicated (and longer) because we must make sure that the address of
ftrace location is 8 byte aligned, and the offset passed to ldd for
fetching the address is 8 byte aligned as well.

Note that gcc has a bug which misplaces the function label, and needs a
patch to make dynamic ftrace work. See
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90751 for details.

Signed-off-by: Sven Schnelle 
Signed-off-by: Helge Deller

parisc: generate uapi header and system call table files

2018-12-10T07:26:04+00:00

System call table generation script must be run to gener-
ate unistd_32/64.h and syscall_table_32/64/c32.h files.
This patch will have changes which will invokes the script.

This patch will generate unistd_32/64.h and syscall_table-
_32/64/c32.h files by the syscall table generation script
invoked by parisc/Makefile 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/syscall.S file.

Signed-off-by: Firoz Khan 
Acked-by: Helge Deller 
Signed-off-by: Helge Deller

parisc: Enable -ffunction-sections for modules on 32-bit kernel

2018-12-02T19:34:07+00:00

Frank Schreiner reported, that since kernel 4.18 he faces sysfs-warnings
when loading modules on a 32-bit kernel. Here is one such example:

 sysfs: cannot create duplicate filename '/module/nfs/sections/.text'
 CPU: 0 PID: 98 Comm: modprobe Not tainted 4.18.0-2-parisc #1 Debian 4.18.10-2
 Backtrace:
  [<1017ce2c>] show_stack+0x3c/0x50
  [<107a7210>] dump_stack+0x28/0x38
  [<103f900c>] sysfs_warn_dup+0x88/0xac
  [<103f8b1c>] sysfs_add_file_mode_ns+0x164/0x1d0
  [<103f9e70>] internal_create_group+0x11c/0x304
  [<103fa0a0>] sysfs_create_group+0x48/0x60
  [<1022abe8>] load_module.constprop.35+0x1f9c/0x23b8
  [<1022b278>] sys_finit_module+0xd0/0x11c
  [<101831dc>] syscall_exit+0x0/0x14

This warning gets triggered by the fact, that due to commit 24b6c22504a2
("parisc: Build kernel without -ffunction-sections") we now get multiple .text
sections in the kernel modules for which sysfs_create_group() can't create
multiple virtual files.

This patch works around the problem by re-enabling the -ffunction-sections
compiler option for modules, while keeping it disabled for the non-module
kernel code.

Reported-by: Frank Scheiner 
Fixes: 24b6c22504a2 ("parisc: Build kernel without -ffunction-sections")
Cc:  # v4.18+
Signed-off-by: Helge Deller

parisc: remove check for minimum required GCC version

2018-10-17T06:18:00+00:00

Commit cafa0010cd51 ("Raise the minimum required gcc version to 4.6")
bumped the minimum GCC version to 4.6 for all architectures.

The version check in arch/parisc/Makefile is obsolete now.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Helge Deller