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make kernel-side POLL... arch-independent

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mangle/demangle on the way to/from userland

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
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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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>