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40272035e1
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Christophe Leroy 40272035e1 powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32 
When the BPF routine doesn't call any function, the non volatile
registers can be reallocated to volatile registers in order to
avoid having to save them/restore on the stack.

Before this patch, the test #359 ADD default X is:

   0:	7c 64 1b 78 	mr      r4,r3
   4:	38 60 00 00 	li      r3,0
   8:	94 21 ff b0 	stwu    r1,-80(r1)
   c:	60 00 00 00 	nop
  10:	92 e1 00 2c 	stw     r23,44(r1)
  14:	93 01 00 30 	stw     r24,48(r1)
  18:	93 21 00 34 	stw     r25,52(r1)
  1c:	93 41 00 38 	stw     r26,56(r1)
  20:	39 80 00 00 	li      r12,0
  24:	39 60 00 00 	li      r11,0
  28:	3b 40 00 00 	li      r26,0
  2c:	3b 20 00 00 	li      r25,0
  30:	7c 98 23 78 	mr      r24,r4
  34:	7c 77 1b 78 	mr      r23,r3
  38:	39 80 00 42 	li      r12,66
  3c:	39 60 00 00 	li      r11,0
  40:	7d 8c d2 14 	add     r12,r12,r26
  44:	39 60 00 00 	li      r11,0
  48:	7d 83 63 78 	mr      r3,r12
  4c:	82 e1 00 2c 	lwz     r23,44(r1)
  50:	83 01 00 30 	lwz     r24,48(r1)
  54:	83 21 00 34 	lwz     r25,52(r1)
  58:	83 41 00 38 	lwz     r26,56(r1)
  5c:	38 21 00 50 	addi    r1,r1,80
  60:	4e 80 00 20 	blr

After this patch, the same test has become:

   0:	7c 64 1b 78 	mr      r4,r3
   4:	38 60 00 00 	li      r3,0
   8:	94 21 ff b0 	stwu    r1,-80(r1)
   c:	60 00 00 00 	nop
  10:	39 80 00 00 	li      r12,0
  14:	39 60 00 00 	li      r11,0
  18:	39 00 00 00 	li      r8,0
  1c:	38 e0 00 00 	li      r7,0
  20:	7c 86 23 78 	mr      r6,r4
  24:	7c 65 1b 78 	mr      r5,r3
  28:	39 80 00 42 	li      r12,66
  2c:	39 60 00 00 	li      r11,0
  30:	7d 8c 42 14 	add     r12,r12,r8
  34:	39 60 00 00 	li      r11,0
  38:	7d 83 63 78 	mr      r3,r12
  3c:	38 21 00 50 	addi    r1,r1,80
  40:	4e 80 00 20 	blr

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b94562d7d2bb21aec89de0c40bb3cd91054b65a2.1616430991.git.christophe.leroy@csgroup.eu
2021-04-03 21:22:21 +11:00
arch powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32 2021-04-03 21:22:21 +11:00
block block: Discard page cache of zone reset target range 2021-03-11 11:49:25 -07:00
certs certs: Replace K{U,G}IDT_INIT() with GLOBAL_ROOT_{U,G}ID 2021-01-21 16:16:10 +00:00
crypto crypto: mips/poly1305 - enable for all MIPS processors 2021-03-08 11:52:17 +01:00
Documentation powerpc/bpf: Implement extended BPF on PPC32 2021-04-03 21:22:21 +11:00
drivers cxl: Fix couple of spellings 2021-03-29 13:22:18 +11:00
fs Merge branch 'akpm' (patches from Andrew) 2021-03-14 12:23:34 -07:00
include signal: Add unsafe_get_compat_sigset() 2021-04-03 21:22:18 +11:00
init Merge branch 'akpm' (patches from Andrew) 2021-03-14 12:23:34 -07:00
ipc fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
kernel prctl: fix PR_SET_MM_AUXV kernel stack leak 2021-03-14 14:33:27 -07:00
lib kasan: fix KASAN_STACK dependency for HW_TAGS 2021-03-13 11:27:31 -08:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
mm Merge branch 'akpm' (patches from Andrew) 2021-03-14 12:23:34 -07:00
net NFS Client Bugfixes for Linux 5.10-rc3 2021-03-12 14:19:35 -08:00
samples Merge git://git.kernel.org:/pub/scm/linux/kernel/git/netdev/net 2021-03-09 17:15:56 -08:00
scripts kbuild: fix ld-version.sh to not be affected by locale 2021-03-13 11:12:13 +09:00
security Revert 95ebabde38 ("capabilities: Don't allow writing ambiguous v3 file capabilities") 2021-03-12 15:27:14 -06:00
sound ALSA: hda/hdmi: Cancel pending works before suspend 2021-03-10 12:52:01 +01:00
tools selftests/powerpc: unmark non-kernel-doc comments 2021-03-29 13:22:18 +11:00
usr Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
virt KVM: x86/mmu: Consider the hva in mmu_notifier retry 2021-02-22 13:16:53 -05:00
.clang-format cxl for 5.12 2021-02-24 09:38:36 -08:00
.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 clang-lto series for v5.12-rc1 2021-02-23 09:28:51 -08:00
.mailmap treewide: Miguel has moved 2021-02-26 09:41:03 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS treewide: Miguel has moved 2021-02-26 09:41:03 -08:00
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 Merge branch 'akpm' (patches from Andrew) 2021-03-14 12:23:34 -07:00
Makefile Linux 5.12-rc3 2021-03-14 14:41:02 -07:00
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.