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um: vdso: Remove getcpu support on x86

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We are going to support SMP on UML/x86, so we can't hard code
the CPU and NUMA node in __vdso_getcpu() anymore. Let's just
remove it and let applications fall back to the syscall.

Suggested-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20251027001815.1666872-7-tiwei.bie@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Tiwei Bie 2025-10-27 08:18:13 +08:00 committed by Johannes Berg
parent 1e4ee5135d
commit 37f847b794
2 changed files with 0 additions and 24 deletions
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22
arch/x86/um/vdso/um_vdso.c
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@ -11,12 +11,8 @@
#include <vdso/gettime.h>
#include <linux/time.h>
#include <linux/getcpu.h>
#include <asm/unistd.h>
/* workaround for -Wmissing-prototypes warnings */
long __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused);
int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
{
long ret;
@ -56,21 +52,3 @@ __kernel_old_time_t __vdso_time(__kernel_old_time_t *t)
return secs;
}
__kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time")));
long
__vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused)
{
/*
* UML does not support SMP, we can cheat here. :)
*/
if (cpu)
*cpu = 0;
if (node)
*node = 0;
return 0;
}
long getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *tcache)
__attribute__((weak, alias("__vdso_getcpu")));

2
arch/x86/um/vdso/vdso.lds.S
View File

@ -22,8 +22,6 @@ VERSION {
__vdso_clock_gettime;
gettimeofday;
__vdso_gettimeofday;
getcpu;
__vdso_getcpu;
time;
__vdso_time;
local: *;