AuxXxilium/linux_dsm_epyc7002
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902137ba8e
linux_dsm_epyc7002/arch/powerpc
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Christophe Leroy 902137ba8e powerpc/32: Add VDSO version of getcpu on non SMP 
Commit 18ad51dd34 ("powerpc: Add VDSO version of getcpu") added
getcpu() for PPC64 only, by making use of a user readable general
purpose SPR.

PPC32 doesn't have any such SPR.

For non SMP, just return CPU id 0 from the VDSO directly.
PPC32 doesn't support CONFIG_NUMA so NUMA node is always 0.

Before the patch, vdsotest reported:
getcpu: syscall: 1572 nsec/call
getcpu:    libc: 1787 nsec/call
getcpu:    vdso: not tested

Now, vdsotest reports:
getcpu: syscall: 1582 nsec/call
getcpu:    libc: 502 nsec/call
getcpu:    vdso: 187 nsec/call

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/eaac4b6494ecff1811220fccc895bf282aab884a.1575273217.git.christophe.leroy@c-s.fr
2020-01-23 21:31:14 +11:00
..
boot powerpc/devicetrees: Change 'gpios' to 'cs-gpios' on fsl, spi nodes 2020-01-23 21:31:14 +11:00
configs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2019-12-01 13:26:18 -08:00
crypto powerpc updates for 5.5 2019-11-30 14:35:43 -08:00
include powerpc/hw_breakpoints: Rewrite 8xx breakpoints to allow any address range size. 2020-01-23 21:31:14 +11:00
kernel powerpc/32: Add VDSO version of getcpu on non SMP 2020-01-23 21:31:14 +11:00
kexec
kvm PPC: 2019-12-22 10:26:59 -08:00
lib powerpc: Fix __clear_user() with KUAP enabled 2019-12-16 23:19:44 +11:00
math-emu
mm powerpc/8xx: Fix permanently mapped IMMR region. 2020-01-23 21:31:14 +11:00
net treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
oprofile
perf powerpc updates for 5.5 2019-11-30 14:35:43 -08:00
platforms powerpc/64s: Reimplement power4_idle code in C 2020-01-16 14:59:37 +10:00
purgatory
sysdev powerpc/mpic: constify copied structure 2020-01-07 21:42:16 +11:00
tools
xmon powerpc/xmon: don't access ASDR in VMs 2020-01-14 11:04:08 +10:00
Kbuild
Kconfig powerpc: Remove STRICT_KERNEL_RWX incompatibility with RELOCATABLE 2020-01-16 14:59:36 +10:00
Kconfig.debug powerpc/ptdump: Only enable PPC_CHECK_WX with STRICT_KERNEL_RWX 2020-01-23 21:31:13 +11:00
Makefile
Makefile.postlink