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make kernel-side POLL... arch-independent 

mangle/demangle on the way to/from userland

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
hifive-unleashed-5.1
Al Viro 2017-11-29 19:00:41 -05:00
parent 69112736e2
commit c71d227fc4
10 changed files with 125 additions and 8 deletions
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19
arch/blackfin/include/uapi/asm/poll.h
View File

@ -9,8 +9,25 @@
#ifndef _UAPI__BFIN_POLL_H
#define _UAPI__BFIN_POLL_H
#define POLLWRNORM (__force __poll_t)4 /* POLLOUT */
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND (__force __poll_t)256
#else
#define __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
__u16 v = (__force __u16)val;
/* bit 9 -> bit 8, bit 8 -> bit 2 */
return (v & ~0x300) | ((v & 0x200) >> 1) | ((v & 0x100) >> 6);
}
static inline __poll_t demangle_poll(__u16 v)
{
/* bit 8 -> bit 9, bit 2 -> bits 2 and 8 */
return (__force __poll_t)((v & ~0x100) | ((v & 0x100) << 1) |
((v & 4) << 6));
}
#endif
#include <asm-generic/poll.h>

19
arch/frv/include/uapi/asm/poll.h
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@ -2,12 +2,27 @@
#ifndef _ASM_POLL_H
#define _ASM_POLL_H
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND (__force __poll_t)256
#else
#define __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
__u16 v = (__force __u16)val;
/* bit 9 -> bit 8, bit 8 -> bit 2 */
return (v & ~0x300) | ((v & 0x200) >> 1) | ((v & 0x100) >> 6);
}
static inline __poll_t demangle_poll(__u16 v)
{
/* bit 8 -> bit 9, bit 2 -> bits 2 and 8 */
return (__force __poll_t)((v & ~0x100) | ((v & 0x100) << 1) |
((v & 4) << 6));
}
#endif
#include <asm-generic/poll.h>
#undef POLLREMOVE
#endif

17
arch/m68k/include/uapi/asm/poll.h
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@ -2,8 +2,25 @@
#ifndef __m68k_POLL_H
#define __m68k_POLL_H
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND (__force __poll_t)256
#else
#define __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
__u16 v = (__force __u16)val;
/* bit 9 -> bit 8, bit 8 -> bit 2 */
return (v & ~0x300) | ((v & 0x200) >> 1) | ((v & 0x100) >> 6);
}
static inline __poll_t demangle_poll(__u16 v)
{
/* bit 8 -> bit 9, bit 2 -> bits 2 and 8 */
return (__force __poll_t)((v & ~0x100) | ((v & 0x100) << 1) |
((v & 4) << 6));
}
#endif
#include <asm-generic/poll.h>

17
arch/mips/include/uapi/asm/poll.h
View File

@ -2,8 +2,25 @@
#ifndef __ASM_POLL_H
#define __ASM_POLL_H
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND (__force __poll_t)0x0100
#else
#define __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
__u16 v = (__force __u16)val;
/* bit 9 -> bit 8, bit 8 -> bit 2 */
return (v & ~0x300) | ((v & 0x200) >> 1) | ((v & 0x100) >> 6);
}
static inline __poll_t demangle_poll(__u16 v)
{
/* bit 8 -> bit 9, bit 2 -> bits 2 and 8 */
return (__force __poll_t)((v & ~0x100) | ((v & 0x100) << 1) |
((v & 4) << 6));
}
#endif
#include <asm-generic/poll.h>

20
arch/sparc/include/uapi/asm/poll.h
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@ -2,11 +2,31 @@
#ifndef __SPARC_POLL_H
#define __SPARC_POLL_H
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND (__force __poll_t)256
#define POLLMSG (__force __poll_t)512
#define POLLREMOVE (__force __poll_t)1024
#define POLLRDHUP (__force __poll_t)2048
#else
#define __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
__u16 v = (__force __u16)val;
/* bit 9 -> bit 8, bit 8 -> bit 2, bit 13 -> bit 11 */
return (v & ~0x300) | ((v & 0x200) >> 1) | ((v & 0x100) >> 6) |
((v & 0x2000) >> 2);
}
static inline __poll_t demangle_poll(__u16 v)
{
/* bit 8 -> bit 9, bit 2 -> bits 2 and 8 */
return (__force __poll_t)((v & ~0x100) | ((v & 0x100) << 1) |
((v & 4) << 6) | ((v & 0x800) << 2));
}
#endif
#include <asm-generic/poll.h>

17
arch/xtensa/include/uapi/asm/poll.h
View File

@ -12,9 +12,26 @@
#ifndef _XTENSA_POLL_H
#define _XTENSA_POLL_H
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND (__force __poll_t)0x0100
#define POLLREMOVE (__force __poll_t)0x0800
#else
#define __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
__u16 v = (__force __u16)val;
/* bit 9 -> bit 8, bit 8 -> bit 2 */
return (v & ~0x300) | ((v & 0x200) >> 1) | ((v & 0x100) >> 6);
}
static inline __poll_t demangle_poll(__u16 v)
{
/* bit 8 -> bit 9, bit 2 -> bits 2 and 8 */
return (__force __poll_t)((v & ~0x100) | ((v & 0x100) << 1) |
((v & 4) << 6));
}
#endif
#include <asm-generic/poll.h>

2
fs/fcntl.c
View File

@ -758,7 +758,7 @@ static void send_sigio_to_task(struct task_struct *p,
if (reason - POLL_IN >= NSIGPOLL)
si.si_band = ~0L;
else
si.si_band = (__force long)band_table[reason - POLL_IN];
si.si_band = mangle_poll(band_table[reason - POLL_IN]);
si.si_fd = fd;
if (!do_send_sig_info(signum, &si, p, group))
break;

4
fs/fuse/file.c
View File

@ -2764,7 +2764,7 @@ __poll_t fuse_file_poll(struct file *file, poll_table *wait)
return DEFAULT_POLLMASK;
poll_wait(file, &ff->poll_wait, wait);
inarg.events = (__u32)poll_requested_events(wait);
inarg.events = mangle_poll(poll_requested_events(wait));
/*
* Ask for notification iff there's someone waiting for it.
@ -2786,7 +2786,7 @@ __poll_t fuse_file_poll(struct file *file, poll_table *wait)
err = fuse_simple_request(fc, &args);
if (!err)
return outarg.revents;
return demangle_poll(outarg.revents);
if (err == -ENOSYS) {
fc->no_poll = 1;
return DEFAULT_POLLMASK;

4
fs/select.c
View File

@ -817,7 +817,7 @@ static inline __poll_t do_pollfd(struct pollfd *pollfd, poll_table *pwait,
mask = POLLNVAL;
if (f.file) {
/* userland u16 ->events contains POLL... bitmap */
__poll_t filter = (__force __poll_t)pollfd->events |
__poll_t filter = demangle_poll(pollfd->events) |
POLLERR | POLLHUP;
mask = DEFAULT_POLLMASK;
if (f.file->f_op->poll) {
@ -833,7 +833,7 @@ static inline __poll_t do_pollfd(struct pollfd *pollfd, poll_table *pwait,
}
}
/* ... and so does ->revents */
pollfd->revents = (__force u16)mask;
pollfd->revents = mangle_poll(mask);
return mask;
}

14
include/uapi/asm-generic/poll.h
View File

@ -33,6 +33,20 @@
#define POLL_BUSY_LOOP (__force __poll_t)0x8000
#ifdef __KERNEL__
#ifndef __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
return (__force __u16)val;
}
static inline __poll_t demangle_poll(__u16 v)
{
return (__force __poll_t)v;
}
#endif
#endif
struct pollfd {
int fd;
short events;