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5b90b9661a
linux/arch/powerpc
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Christophe Leroy 5b90b9661a powerpc/syscall: Avoid storing 'current' in another pointer 
By saving the pointer pointing to thread_info.flags, gcc copies r2
in a non-volatile register.

We know 'current' doesn't change, so avoid that intermediaite pointer.

Reduces null_syscall benchmark by 2 cycles (322 => 320 cycles)

On PPC64, gcc seems to know that 'current' is not changing, and it keeps
it in a non volatile register to avoid multiple read of 'current' in paca.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ad0363ff0ff8c125f40e1cdc589a85bbd7e31693.1612946484.git.christophe.leroy@csgroup.eu
2021-02-11 23:35:13 +11:00
..
boot powerpc/boot: Fix build of dts/fsl 2020-12-21 22:06:09 +11:00
configs powerpc/akebono: Fix unmet dependency errors 2021-02-09 00:10:50 +11:00
crypto crypto: powerpc/sha256-spe - Fix sparse endianness warning 2020-11-27 17:13:41 +11:00
include powerpc/32: Handle bookE debugging in C in syscall entry/exit 2021-02-11 23:35:12 +11:00
kernel powerpc/syscall: Avoid storing 'current' in another pointer 2021-02-11 23:35:13 +11:00
kexec powerpc/kexec_file: fix FDT size estimation for kdump kernel 2021-02-11 23:35:07 +11:00
kvm powerpc/xive: Assign boolean values to a bool variable 2021-02-11 23:35:06 +11:00
lib powerpc/sstep: Fix darn emulation 2021-02-09 01:10:08 +11:00
math-emu
mm powerpc/mm: Remove dcache flush from memory remove. 2021-02-11 23:35:07 +11:00
net bpf, powerpc: Fix misuse of fallthrough in bpf_jit_comp() 2020-09-29 16:39:11 +02:00
oprofile powerpc/oprofile: fix spelling mistake "contex" -> "context" 2020-08-25 01:31:33 +10:00
perf powerpc/perf: Record counter overflow always if SAMPLE_IP is unset 2021-02-09 01:09:46 +11:00
platforms powerpc/mm: Remove dcache flush from memory remove. 2021-02-11 23:35:07 +11:00
purgatory powerpc/kexec_file: Enable early kernel OPAL calls 2020-07-29 23:47:55 +10:00
sysdev powerpc/xive: Improve error reporting of OPAL calls 2020-12-11 09:53:11 +11:00
tools powerpc/tools: Remove 90 line limit in checkpatch script 2020-09-08 22:57:11 +10:00
xmon powerpc/32s: mfsrin()/mtsrin() become mfsr()/mtsr() 2021-02-09 01:10:15 +11:00
Kbuild powerpc/kexec: Move kexec files into a dedicated subdir. 2019-11-21 15:41:34 +11:00
Kconfig powerpc/64: context tracking remove _TIF_NOHZ 2021-02-09 00:02:12 +11:00
Kconfig.debug powerpc/xmon: Select CONSOLE_POLL for the 8xx 2021-01-31 22:35:51 +11:00
Makefile powerpc updates for 5.11 2020-12-17 13:34:25 -08:00
Makefile.postlink powerpc: unrel_branch_check.sh: use nm to find symbol value 2020-09-02 11:00:22 +10:00