[PATCH v4 1/8] powerpc/32: Add VDSO version of getcpu on non SMP

[Michael Ellerman]

On Mon, 2019-12-02 at 07:57:27 UTC, Christophe Leroy wrote:
> Commit 18ad51dd342a ("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 at c-s.fr>

Patches 1, 2 and 4-8, applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/902137ba8e469ed07c7f120a390161937a6288fb

cheers