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Christophe Leroy 63f501e07a powerpc/8xx: Simplify TLB handling 
In the old days, TLB handling for 8xx was using tlbie and tlbia
instructions directly as much as possible.

But commit f048aace29 ("powerpc/mm: Add SMP support to no-hash
TLB handling") broke that by introducing out-of-line unnecessary
complex functions for booke/smp which don't have tlbie/tlbia
instructions and require more complex handling.

Restore direct use of tlbie and tlbia for 8xx which is never SMP.

With this patch we now get

	c00ecc68 <ptep_clear_flush>:
	c00ecc68:	39 00 00 00 	li      r8,0
	c00ecc6c:	81 46 00 00 	lwz     r10,0(r6)
	c00ecc70:	91 06 00 00 	stw     r8,0(r6)
	c00ecc74:	7c 00 2a 64 	tlbie   r5,r0
	c00ecc78:	7c 00 04 ac 	hwsync
	c00ecc7c:	91 43 00 00 	stw     r10,0(r3)
	c00ecc80:	4e 80 00 20 	blr

Before it was

	c0012880 <local_flush_tlb_page>:
	c0012880:	2c 03 00 00 	cmpwi   r3,0
	c0012884:	41 82 00 54 	beq     c00128d8 <local_flush_tlb_page+0x58>
	c0012888:	81 22 00 00 	lwz     r9,0(r2)
	c001288c:	81 43 00 20 	lwz     r10,32(r3)
	c0012890:	39 29 00 01 	addi    r9,r9,1
	c0012894:	91 22 00 00 	stw     r9,0(r2)
	c0012898:	2c 0a 00 00 	cmpwi   r10,0
	c001289c:	41 82 00 10 	beq     c00128ac <local_flush_tlb_page+0x2c>
	c00128a0:	81 2a 01 dc 	lwz     r9,476(r10)
	c00128a4:	2c 09 ff ff 	cmpwi   r9,-1
	c00128a8:	41 82 00 0c 	beq     c00128b4 <local_flush_tlb_page+0x34>
	c00128ac:	7c 00 22 64 	tlbie   r4,r0
	c00128b0:	7c 00 04 ac 	hwsync
	c00128b4:	81 22 00 00 	lwz     r9,0(r2)
	c00128b8:	39 29 ff ff 	addi    r9,r9,-1
	c00128bc:	2c 09 00 00 	cmpwi   r9,0
	c00128c0:	91 22 00 00 	stw     r9,0(r2)
	c00128c4:	4c a2 00 20 	bclr+   4,eq
	c00128c8:	81 22 00 70 	lwz     r9,112(r2)
	c00128cc:	71 29 00 04 	andi.   r9,r9,4
	c00128d0:	4d 82 00 20 	beqlr
	c00128d4:	48 65 76 74 	b       c0669f48 <preempt_schedule>
	c00128d8:	81 22 00 00 	lwz     r9,0(r2)
	c00128dc:	39 29 00 01 	addi    r9,r9,1
	c00128e0:	91 22 00 00 	stw     r9,0(r2)
	c00128e4:	4b ff ff c8 	b       c00128ac <local_flush_tlb_page+0x2c>
...
	c00ecdc8 <ptep_clear_flush>:
	c00ecdc8:	94 21 ff f0 	stwu    r1,-16(r1)
	c00ecdcc:	39 20 00 00 	li      r9,0
	c00ecdd0:	93 c1 00 08 	stw     r30,8(r1)
	c00ecdd4:	83 c6 00 00 	lwz     r30,0(r6)
	c00ecdd8:	91 26 00 00 	stw     r9,0(r6)
	c00ecddc:	93 e1 00 0c 	stw     r31,12(r1)
	c00ecde0:	7c 08 02 a6 	mflr    r0
	c00ecde4:	7c 7f 1b 78 	mr      r31,r3
	c00ecde8:	7c 83 23 78 	mr      r3,r4
	c00ecdec:	7c a4 2b 78 	mr      r4,r5
	c00ecdf0:	90 01 00 14 	stw     r0,20(r1)
	c00ecdf4:	4b f2 5a 8d 	bl      c0012880 <local_flush_tlb_page>
	c00ecdf8:	93 df 00 00 	stw     r30,0(r31)
	c00ecdfc:	7f e3 fb 78 	mr      r3,r31
	c00ece00:	80 01 00 14 	lwz     r0,20(r1)
	c00ece04:	83 c1 00 08 	lwz     r30,8(r1)
	c00ece08:	83 e1 00 0c 	lwz     r31,12(r1)
	c00ece0c:	7c 08 03 a6 	mtlr    r0
	c00ece10:	38 21 00 10 	addi    r1,r1,16
	c00ece14:	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/fb324f1c8f2ddb57cf6aad1cea26329558f1c1c0.1631887021.git.christophe.leroy@csgroup.eu
 		2021-10-22 15:22:05 +11:00
Documentation Devicetree fixes for v5.15, take 2: 2021-09-18 12:40:55 -07:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch powerpc/8xx: Simplify TLB handling 2021-10-22 15:22:05 +11:00
block blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd 2021-09-15 12:03:18 -06:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2021-08-30 12:57:10 -07:00
drivers video: fbdev: chipsfb: use memset_io() instead of memset() 2021-10-09 00:15:59 +11:00
fs iov_iter.3-5.15-2021-09-17 2021-09-17 09:23:44 -07:00
include pci_iounmap'2: Electric Boogaloo: try to make sense of it all 2021-09-19 17:13:35 -07:00
init memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
ipc ipc: remove memcg accounting for sops objects in do_semtimedop() 2021-09-14 10:22:11 -07:00
kernel A single fix for the perf core where a value read with READ_ONCE() was 2021-09-19 13:22:40 -07:00
lib pci_iounmap'2: Electric Boogaloo: try to make sense of it all 2021-09-19 17:13:35 -07:00
mm memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
net Networking fixes for 5.15-rc2, including fixes from bpf. 2021-09-16 13:05:42 -07:00
samples kgdb patches for 5.15 2021-09-07 12:08:04 -07:00
scripts Kbuild fixes for v5.15 2021-09-19 12:55:12 -07:00
security Kbuild updates for v5.15 2021-09-03 15:33:47 -07:00
sound sound fixes for 5.15-rc1 2021-09-09 16:05:10 -07:00
tools powerpc fixes for 5.15 #2 2021-09-19 13:00:23 -07:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Drop unused kvm_dirty_gfn_invalid() 2021-09-06 08:23:46 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.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 Matthias Fuchs and Thomas Körper 2021-08-19 09:39:44 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -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 MAINTAINERS: Add Nirmal Patel as VMD maintainer 2021-09-15 16:44:03 -05:00
Makefile Linux 5.15-rc2 2021-09-19 17:28:22 -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.