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Christophe Leroy 328e7e487a powerpc: force inlining of csum_partial() to avoid multiple csum_partial() with GCC10 
ppc-linux-objdump -d vmlinux | grep -e "<csum_partial>" -e "<__csum_partial>"

With gcc9 I get:

	c0017ef8 <__csum_partial>:
	c00182fc:	4b ff fb fd 	bl      c0017ef8 <__csum_partial>
	c0018478:	4b ff fa 80 	b       c0017ef8 <__csum_partial>
	c03e8458:	4b c2 fa a0 	b       c0017ef8 <__csum_partial>
	c03e8518:	4b c2 f9 e1 	bl      c0017ef8 <__csum_partial>
	c03ef410:	4b c2 8a e9 	bl      c0017ef8 <__csum_partial>
	c03f0b24:	4b c2 73 d5 	bl      c0017ef8 <__csum_partial>
	c04279a4:	4b bf 05 55 	bl      c0017ef8 <__csum_partial>
	c0429820:	4b be e6 d9 	bl      c0017ef8 <__csum_partial>
	c0429944:	4b be e5 b5 	bl      c0017ef8 <__csum_partial>
	c042b478:	4b be ca 81 	bl      c0017ef8 <__csum_partial>
	c042b554:	4b be c9 a5 	bl      c0017ef8 <__csum_partial>
	c045f15c:	4b bb 8d 9d 	bl      c0017ef8 <__csum_partial>
	c0492190:	4b b8 5d 69 	bl      c0017ef8 <__csum_partial>
	c0492310:	4b b8 5b e9 	bl      c0017ef8 <__csum_partial>
	c0495594:	4b b8 29 65 	bl      c0017ef8 <__csum_partial>
	c049c420:	4b b7 ba d9 	bl      c0017ef8 <__csum_partial>
	c049c870:	4b b7 b6 89 	bl      c0017ef8 <__csum_partial>
	c049c930:	4b b7 b5 c9 	bl      c0017ef8 <__csum_partial>
	c04a9ca0:	4b b6 e2 59 	bl      c0017ef8 <__csum_partial>
	c04bdde4:	4b b5 a1 15 	bl      c0017ef8 <__csum_partial>
	c04be480:	4b b5 9a 79 	bl      c0017ef8 <__csum_partial>
	c04be710:	4b b5 97 e9 	bl      c0017ef8 <__csum_partial>
	c04c969c:	4b b4 e8 5d 	bl      c0017ef8 <__csum_partial>
	c04ca2fc:	4b b4 db fd 	bl      c0017ef8 <__csum_partial>
	c04cf5bc:	4b b4 89 3d 	bl      c0017ef8 <__csum_partial>
	c04d0440:	4b b4 7a b9 	bl      c0017ef8 <__csum_partial>

With gcc10 I get:

	c0018d08 <__csum_partial>:
	c0019020 <csum_partial>:
	c0019020:	4b ff fc e8 	b       c0018d08 <__csum_partial>
	c001914c:	4b ff fe d4 	b       c0019020 <csum_partial>
	c0019250:	4b ff fd d1 	bl      c0019020 <csum_partial>
	c03e404c <csum_partial>:
	c03e404c:	4b c3 4c bc 	b       c0018d08 <__csum_partial>
	c03e4050:	4b ff ff fc 	b       c03e404c <csum_partial>
	c03e40fc:	4b ff ff 51 	bl      c03e404c <csum_partial>
	c03e6680:	4b ff d9 cd 	bl      c03e404c <csum_partial>
	c03e68c4:	4b ff d7 89 	bl      c03e404c <csum_partial>
	c03e7934:	4b ff c7 19 	bl      c03e404c <csum_partial>
	c03e7bf8:	4b ff c4 55 	bl      c03e404c <csum_partial>
	c03eb148:	4b ff 8f 05 	bl      c03e404c <csum_partial>
	c03ecf68:	4b c2 bd a1 	bl      c0018d08 <__csum_partial>
	c04275b8 <csum_partial>:
	c04275b8:	4b bf 17 50 	b       c0018d08 <__csum_partial>
	c0427884:	4b ff fd 35 	bl      c04275b8 <csum_partial>
	c0427b18:	4b ff fa a1 	bl      c04275b8 <csum_partial>
	c0427bd8:	4b ff f9 e1 	bl      c04275b8 <csum_partial>
	c0427cd4:	4b ff f8 e5 	bl      c04275b8 <csum_partial>
	c0427e34:	4b ff f7 85 	bl      c04275b8 <csum_partial>
	c045a1c0:	4b bb eb 49 	bl      c0018d08 <__csum_partial>
	c0489464 <csum_partial>:
	c0489464:	4b b8 f8 a4 	b       c0018d08 <__csum_partial>
	c04896b0:	4b ff fd b5 	bl      c0489464 <csum_partial>
	c048982c:	4b ff fc 39 	bl      c0489464 <csum_partial>
	c0490158:	4b b8 8b b1 	bl      c0018d08 <__csum_partial>
	c0492f0c <csum_partial>:
	c0492f0c:	4b b8 5d fc 	b       c0018d08 <__csum_partial>
	c049326c:	4b ff fc a1 	bl      c0492f0c <csum_partial>
	c049333c:	4b ff fb d1 	bl      c0492f0c <csum_partial>
	c0493b18:	4b ff f3 f5 	bl      c0492f0c <csum_partial>
	c0493f50:	4b ff ef bd 	bl      c0492f0c <csum_partial>
	c0493ffc:	4b ff ef 11 	bl      c0492f0c <csum_partial>
	c04a0f78:	4b b7 7d 91 	bl      c0018d08 <__csum_partial>
	c04b3e3c:	4b b6 4e cd 	bl      c0018d08 <__csum_partial>
	c04b40d0 <csum_partial>:
	c04b40d0:	4b b6 4c 38 	b       c0018d08 <__csum_partial>
	c04b4448:	4b ff fc 89 	bl      c04b40d0 <csum_partial>
	c04b46f4:	4b ff f9 dd 	bl      c04b40d0 <csum_partial>
	c04bf448:	4b b5 98 c0 	b       c0018d08 <__csum_partial>
	c04c5264:	4b b5 3a a5 	bl      c0018d08 <__csum_partial>
	c04c61e4:	4b b5 2b 25 	bl      c0018d08 <__csum_partial>

gcc10 defines multiple versions of csum_partial() which are just
an unconditionnal branch to __csum_partial().

To enforce inlining of that branch to __csum_partial(),
mark csum_partial() as __always_inline.

With this patch with gcc10:

	c0018d08 <__csum_partial>:
	c0019148:	4b ff fb c0 	b       c0018d08 <__csum_partial>
	c001924c:	4b ff fa bd 	bl      c0018d08 <__csum_partial>
	c03e40ec:	4b c3 4c 1d 	bl      c0018d08 <__csum_partial>
	c03e4120:	4b c3 4b e8 	b       c0018d08 <__csum_partial>
	c03eb004:	4b c2 dd 05 	bl      c0018d08 <__csum_partial>
	c03ecef4:	4b c2 be 15 	bl      c0018d08 <__csum_partial>
	c0427558:	4b bf 17 b1 	bl      c0018d08 <__csum_partial>
	c04286e4:	4b bf 06 25 	bl      c0018d08 <__csum_partial>
	c0428cd8:	4b bf 00 31 	bl      c0018d08 <__csum_partial>
	c0428d84:	4b be ff 85 	bl      c0018d08 <__csum_partial>
	c045a17c:	4b bb eb 8d 	bl      c0018d08 <__csum_partial>
	c0489450:	4b b8 f8 b9 	bl      c0018d08 <__csum_partial>
	c0491860:	4b b8 74 a9 	bl      c0018d08 <__csum_partial>
	c0492eec:	4b b8 5e 1d 	bl      c0018d08 <__csum_partial>
	c04a0eac:	4b b7 7e 5d 	bl      c0018d08 <__csum_partial>
	c04b3e34:	4b b6 4e d5 	bl      c0018d08 <__csum_partial>
	c04b426c:	4b b6 4a 9d 	bl      c0018d08 <__csum_partial>
	c04b463c:	4b b6 46 cd 	bl      c0018d08 <__csum_partial>
	c04c004c:	4b b5 8c bd 	bl      c0018d08 <__csum_partial>
	c04c0368:	4b b5 89 a1 	bl      c0018d08 <__csum_partial>
	c04c5254:	4b b5 3a b5 	bl      c0018d08 <__csum_partial>
	c04c60d4:	4b b5 2c 35 	bl      c0018d08 <__csum_partial>

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Segher Boessenkool  <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/a1d31f84ddb0926813b17fcd5cc7f3fa7b4deac2.1602759123.git.christophe.leroy@csgroup.eu
 		2020-12-15 22:50:11 +11:00
Documentation powerpc/64s: flush L1D after user accesses 2020-11-19 23:47:18 +11:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
arch powerpc: force inlining of csum_partial() to avoid multiple csum_partial() with GCC10 2020-12-15 22:50:11 +11:00
block blk-mq: mark flush request as IDLE in flush_end_io() 2020-10-30 08:33:49 -06:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
drivers lkdtm/powerpc: Add SLB multihit test 2020-12-04 01:01:34 +11:00
fs Driver core / Documentation fixes for 5.10-rc2 2020-11-01 09:59:13 -08:00
include ocxl: Update the Process Element Entry 2020-12-04 01:01:30 +11:00
init linux-kselftest-kunit-5.10-rc1 2020-10-18 14:45:59 -07:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel A few fixes for timers/timekeeping: 2020-11-01 11:13:45 -08:00
lib Driver core / Documentation fixes for 5.10-rc2 2020-11-01 09:59:13 -08:00
mm mm/process_vm_access: Add missing #include <linux/compat.h> 2020-10-27 12:41:29 -07:00
net flexible-array member conversion patches for 5.10-rc2 2020-10-31 14:31:28 -07:00
samples misc: mic: remove the MIC drivers 2020-10-28 19:12:03 +01:00
scripts scripts: get_abi.pl: assume ReST format by default 2020-10-30 13:16:03 +01:00
security ima: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
sound powerpc/ps3: make system bus's remove and shutdown callbacks return void 2020-12-04 01:01:22 +11:00
tools lkdtm/powerpc: Add SLB multihit test 2020-12-04 01:01:34 +11:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt kvm: x86/mmu: Support dirty logging for the TDP MMU 2020-10-23 03:42:13 -04:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap MAINTAINERS: jarkko.sakkinen@linux.intel.com -> jarkko@kernel.org 2020-10-16 11:11:19 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Sangbeom Kim to credits 2020-10-26 10:11:18 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Char/Misc fixes/removals for 5.10-rc2 2020-11-01 10:05:16 -08:00
Makefile Linux 5.10-rc2 2020-11-01 14:43:51 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.