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BACKPORT: linux/time32.h: Extract common header for vDSO

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The vDSO library should only include the necessary headers required for
a userspace library (UAPI and a minimal set of kernel headers). To make
this possible it is necessary to isolate from the kernel headers the
common parts that are strictly necessary to build the library.

Split time32.h into linux and common headers to make the latter suitable
for inclusion in the vDSO library.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200320145351.32292-12-vincenzo.frascino@arm.com
(cherry picked from commit 9a4162316965818ea73701b611915deca97afece)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 154668398
Change-Id: Ibdee6540c150092e67497e932d93d6ea1246f753
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:36 +00:00 committed by Alistair Delva
parent ac9cfc4ae7
commit b48b451aec
2 changed files with 18 additions and 3 deletions
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7
include/linux/time32.h
View file

@ -11,6 +11,10 @@
#include <linux/time64.h> #include <linux/time64.h>
#include <linux/timex.h>
#include <vdso/time32.h>
#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
#if __BITS_PER_LONG == 64 #if __BITS_PER_LONG == 64
@ -212,9 +216,6 @@ extern struct __kernel_old_timeval ns_to_kernel_old_timeval(s64 nsec);
* the compat code so it can be shared between 32-bit and 64-bit builds * the compat code so it can be shared between 32-bit and 64-bit builds
* both of which provide compatibility with old 32-bit tasks. * both of which provide compatibility with old 32-bit tasks.
*/ */
#define old_time32_t compat_time_t
#define old_timeval32 compat_timeval
#define old_timespec32 compat_timespec
#define old_itimerspec32 compat_itimerspec #define old_itimerspec32 compat_itimerspec
#define ns_to_old_timeval32 ns_to_compat_timeval #define ns_to_old_timeval32 ns_to_compat_timeval
#define get_old_itimerspec32 get_compat_itimerspec64 #define get_old_itimerspec32 get_compat_itimerspec64

14
include/vdso/time32.h Normal file
View file

@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VDSO_TIME32_H
#define __VDSO_TIME32_H
/*
* New aliases for compat time functions. These will be used to replace
* the compat code so it can be shared between 32-bit and 64-bit builds
* both of which provide compatibility with old 32-bit tasks.
*/
#define old_time32_t compat_time_t
#define old_timeval32 compat_timeval
#define old_timespec32 compat_timespec
#endif /* __VDSO_TIME32_H */