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x86/vdso: Provide getcpu for x86-32.

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Wire up __vdso_getcpu() for x86-32.

The 64bit version is reused with trivial modifications. Contrary to
vclock_gettime.c there is no requirement to fake any defines in the case of
32bit VDSO on a 64bit kernel because the GDT entry from which the CPU and
node information is read is always the native one.

Adopt vdso_getcpu.c by:

 - removing the unneeded time* header files which lead to compile errors
   for 32bit.
 - adding segment.h which provides vdso_read_cpunode() and the defines
   required by it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221125094216.3663444-3-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-11-25 10:42:15 +01:00 committed by Thomas Gleixner
parent 717cce3bdc
commit 92d33063c0
4 changed files with 6 additions and 3 deletions
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3
arch/x86/entry/vdso/Makefile
View file

@ -29,7 +29,7 @@ VDSO32-$(CONFIG_IA32_EMULATION) := y
# files to link into the vdso
vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
vobjs32-y := vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o
vobjs32-y += vdso32/vclock_gettime.o
vobjs32-y += vdso32/vclock_gettime.o vdso32/vgetcpu.o
vobjs-$(CONFIG_X86_SGX) += vsgx.o
# files to link into kernel
@ -104,6 +104,7 @@ $(vobjs): KBUILD_AFLAGS += -DBUILD_VDSO
CFLAGS_REMOVE_vclock_gettime.o = -pg
CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
CFLAGS_REMOVE_vgetcpu.o = -pg
CFLAGS_REMOVE_vdso32/vgetcpu.o = -pg
CFLAGS_REMOVE_vsgx.o = -pg
#

1
arch/x86/entry/vdso/vdso32/vdso32.lds.S
View file

@ -28,6 +28,7 @@ VERSION
__vdso_time;
__vdso_clock_getres;
__vdso_clock_gettime64;
__vdso_getcpu;
};
LINUX_2.5 {

2
arch/x86/entry/vdso/vdso32/vgetcpu.c Normal file
View file

@ -0,0 +1,2 @@
// SPDX-License-Identifier: GPL-2.0
#include "../vgetcpu.c"

3
arch/x86/entry/vdso/vgetcpu.c
View file

@ -7,8 +7,7 @@
#include <linux/kernel.h>
#include <linux/getcpu.h>
#include <linux/time.h>
#include <asm/vgtod.h>
#include <asm/segment.h>
notrace long
__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)