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Christophe Leroy 0b0057cc41 powerpc/bitops: Force inlining of fls() 
Building a kernel with CONFIG_CC_OPTIMISE_FOR_SIZE leads to
the following functions being copied several times in vmlinux:

	31 times __ilog2_u32()
	34 times fls()

Disassembly follows:

	c00f476c <fls>:
	c00f476c:	7c 63 00 34 	cntlzw  r3,r3
	c00f4770:	20 63 00 20 	subfic  r3,r3,32
	c00f4774:	4e 80 00 20 	blr

	c00f4778 <__ilog2_u32>:
	c00f4778:	94 21 ff f0 	stwu    r1,-16(r1)
	c00f477c:	7c 08 02 a6 	mflr    r0
	c00f4780:	90 01 00 14 	stw     r0,20(r1)
	c00f4784:	4b ff ff e9 	bl      c00f476c <fls>
	c00f4788:	80 01 00 14 	lwz     r0,20(r1)
	c00f478c:	38 63 ff ff 	addi    r3,r3,-1
	c00f4790:	7c 08 03 a6 	mtlr    r0
	c00f4794:	38 21 00 10 	addi    r1,r1,16
	c00f4798:	4e 80 00 20 	blr

When forcing inlining of fls(), we get

	c0008b80 <__ilog2_u32>:
	c0008b80:	7c 63 00 34 	cntlzw  r3,r3
	c0008b84:	20 63 00 1f 	subfic  r3,r3,31
	c0008b88:	4e 80 00 20 	blr

vmlinux size gets reduced by 1 kbyte with that change.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/adc9c9d6378f6b5008246ca717993d7870188efb.1644569473.git.christophe.leroy@csgroup.eu
2022-03-08 22:33:03 +11:00
arch powerpc/bitops: Force inlining of fls() 2022-03-08 22:33:03 +11:00
block block: add bio_start_io_acct_time() to control start_time 2022-01-28 12:28:15 -07:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto lib/crypto: add prompts back to crypto libraries 2022-01-18 13:03:55 +01:00
Documentation powerpc/pseries: Interface to represent PAPR firmware attributes 2022-03-08 00:05:00 +11:00
drivers Merge branch 'topic/func-desc-lkdtm' into next 2022-03-07 23:34:32 +11:00
fs ocfs2: fix a deadlock when commit trans 2022-01-30 09:56:58 +02:00
include asm-generic: Refactor dereference_[kernel]_function_descriptor() 2022-02-16 23:25:11 +11:00
init lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
ipc proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
kernel Merge branch 'topic/func-desc-lkdtm' into next 2022-03-07 23:34:32 +11:00
lib kasan: test: fix compatibility with FORTIFY_SOURCE 2022-01-30 09:56:58 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm memory-failure: fetch compound_head after pgmap_pfn_valid() 2022-01-30 09:56:58 +02:00
net \n 2022-01-28 17:51:31 +02:00
samples Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
scripts ftrace: Have architectures opt-in for mcount build time sorting 2022-01-27 19:15:44 -05:00
security Fix NULL pointer crash in LSM via Ceph, from Vivek Goyal <vgoyal@redhat.com>. 2022-01-29 08:52:27 +02:00
sound powerpc/machdep: Move sys_ctrler_t definition into pmac_feature.h 2022-02-07 21:02:20 +11:00
tools selftest/powerpc: Add PAPR sysfs attributes sniff test 2022-03-08 00:05:00 +11:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt Two larger x86 series: 2022-01-28 19:00:26 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address of Brian Silverman 2022-01-24 18:27:23 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
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 Networking fixes for 5.17-rc2, including fixes from netfilter and can. 2022-01-27 20:58:39 +02:00
Makefile Linux 5.17-rc2 2022-01-30 15:37:07 +02:00
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.