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478237a595
clock_getres in the vDSO library has to preserve the same behaviour
of posix_get_hrtimer_res().
In particular, posix_get_hrtimer_res() does:
sec = 0;
ns = hrtimer_resolution;
and hrtimer_resolution depends on the enablement of the high
resolution timers that can happen either at compile or at run time.
Fix the s390 vdso implementation of clock_getres keeping a copy of
hrtimer_resolution in vdso data and using that directly.
Link: https://lkml.kernel.org/r/20200324121027.21665-1-vincenzo.frascino@arm.com
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
[heiko.carstens@de.ibm.com: use llgf for proper zero extension]
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
51 lines
1.2 KiB
ArmAsm
51 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Userland implementation of clock_getres() for 64 bits processes in a
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* s390 kernel for use in the vDSO
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*
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* Copyright IBM Corp. 2008
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <asm/vdso.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/dwarf.h>
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.text
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.align 4
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.globl __kernel_clock_getres
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.type __kernel_clock_getres,@function
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__kernel_clock_getres:
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CFI_STARTPROC
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larl %r1,3f
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lg %r0,0(%r1)
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cghi %r2,__CLOCK_REALTIME_COARSE
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je 0f
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cghi %r2,__CLOCK_MONOTONIC_COARSE
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je 0f
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larl %r1,_vdso_data
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llgf %r0,__VDSO_CLOCK_REALTIME_RES(%r1)
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cghi %r2,__CLOCK_REALTIME
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je 0f
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cghi %r2,__CLOCK_MONOTONIC
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je 0f
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cghi %r2,__CLOCK_THREAD_CPUTIME_ID
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je 0f
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cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */
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jne 2f
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larl %r5,_vdso_data
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icm %r0,15,__LC_ECTG_OK(%r5)
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jz 2f
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0: ltgr %r3,%r3
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jz 1f /* res == NULL */
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xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
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stg %r0,8(%r3) /* store tp->tv_usec */
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1: lghi %r2,0
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br %r14
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2: lghi %r1,__NR_clock_getres /* fallback to svc */
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svc 0
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br %r14
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CFI_ENDPROC
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3: .quad __CLOCK_COARSE_RES
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.size __kernel_clock_getres,.-__kernel_clock_getres
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