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Christophe Leroy 8b4bb0ad00 powerpc/code-patching: Speed up page mapping/unmapping 
Since commit 591b4b2684 ("powerpc/code-patching: Pre-map patch area")
the patch area is premapped so intermediate page tables are already
allocated.

Use __set_pte_at() directly instead of the heavy map_kernel_page(),
at for unmapping just do a pte_clear() followed by a flush.

__set_pte_at() can be used directly without the filters in
set_pte_at() because we are mapping a normal page non executable.

Make sure gcc knows text_poke_area is page aligned in order to
optimise the flush.

This change reduces by 66% the time needed to activate ftrace on
an 8xx (588000 tb ticks instead of 1744000).

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Add ptesync needed on radix to avoid spurious fault]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220815114840.1468656-1-mpe@ellerman.id.au
2022-09-01 13:56:01 +10:00
..
alloc.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
checksum_32.S powerpc/32: Remove remaining .stabs annotations 2022-02-07 21:03:10 +11:00
checksum_64.S ppc: propagate the calling conventions change down to csum_partial_copy_generic() 2020-08-20 15:45:22 -04:00
checksum_wrappers.c net: unexport csum_and_copy_{from,to}_user 2022-04-29 14:37:59 -07:00
code-patching.c powerpc/code-patching: Speed up page mapping/unmapping 2022-09-01 13:56:01 +10:00
copy_32.S powerpc/32: Remove remaining .stabs annotations 2022-02-07 21:03:10 +11:00
copy_mc_64.S x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}() 2020-10-06 11:18:04 +02:00
copypage_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
copypage_power7.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
copyuser_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
copyuser_power7.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
crtsavres.S
div64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
error-inject.c powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
feature-fixups-test.S powerpc: Test prefixed instructions in feature fixups 2020-05-19 00:11:02 +10:00
feature-fixups.c powerpc/inst: Remove PPC_INST_BRANCH 2022-05-22 15:58:27 +10:00
hweight_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
ldstfp.S powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
locks.c powerpc/pseries: Move some PAPR paravirt functions to their own file 2020-07-26 23:34:26 +10:00
Makefile powerpc/kasan: Don't instrument non-maskable or raw interrupts 2022-05-22 15:58:29 +10:00
mem_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
memcmp_32.S
memcmp_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
memcpy_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
memcpy_power7.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pmem.c powerpc/pmem: Include pmem prototypes 2021-01-30 11:39:28 +11:00
quad.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
restart_table.c powerpc/64s: add a table of implicit soft-masked addresses 2021-06-30 22:21:20 +10:00
rheap.c
sstep.c powerpc/64: remove system call instruction emulation 2022-05-06 00:00:20 +10:00
string.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
string_32.S powerpc: Fix __clear_user() with KUAP enabled 2019-12-16 23:19:44 +11:00
string_64.S powerpc: Fix __clear_user() with KUAP enabled 2019-12-16 23:19:44 +11:00
strlen_32.S powerpc/lib: Implement strlen() in assembly for PPC32 2018-08-07 21:49:30 +10:00
test-code-patching.c powerpc/code-patching: Replace patch_instruction() by ppc_inst_write() in selftests 2021-12-23 22:36:58 +11:00
test_emulate_step.c powerpc/ppc-opcode: Define and use PPC_RAW_SETB() 2022-07-27 21:36:05 +10:00
test_emulate_step_exec_instr.S powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
vmx-helper.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
xor_vmx.c lib/xor: make xor prototypes more friendly to compiler vectorization 2022-02-11 20:39:39 +11:00
xor_vmx.h lib/xor: make xor prototypes more friendly to compiler vectorization 2022-02-11 20:39:39 +11:00
xor_vmx_glue.c lib/xor: make xor prototypes more friendly to compiler vectorization 2022-02-11 20:39:39 +11:00