diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-02 07:57:27 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-23 21:31:14 +1100 |
| commit | 902137ba8e469ed07c7f120a390161937a6288fb (patch) | |
| tree | 031cb524d3cd71a32efe368600dbc1c2d93b9117 /arch/powerpc/kernel/vdso32/vdso32.lds.S | |
| parent | 8c452a889821ca0cd2a5f2e3e87fbc01e56408cb (diff) | |
powerpc/32: Add VDSO version of getcpu on non SMP
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@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
Diffstat (limited to 'arch/powerpc/kernel/vdso32/vdso32.lds.S')
| -rw-r--r-- | arch/powerpc/kernel/vdso32/vdso32.lds.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/vdso32/vdso32.lds.S b/arch/powerpc/kernel/vdso32/vdso32.lds.S index 00c025ba4a92..5206c2eb2a1d 100644 --- a/arch/powerpc/kernel/vdso32/vdso32.lds.S +++ b/arch/powerpc/kernel/vdso32/vdso32.lds.S @@ -155,7 +155,7 @@ VERSION __kernel_sync_dicache_p5; __kernel_sigtramp32; __kernel_sigtramp_rt32; -#ifdef CONFIG_PPC64 +#if defined(CONFIG_PPC64) || !defined(CONFIG_SMP) __kernel_getcpu; #endif |