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authorAl Viro <viro@zeniv.linux.org.uk>2018-02-01 15:13:18 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-11 14:37:22 -0800
commit7a163b2195cda0cddf47b5caf14a7229d4e2bea3 (patch)
tree5867e113f0232679d5125ca7d42ae4558dd0d554 /include/linux/poll.h
parenta9a08845e9acbd224e4ee466f5c1275ed50054e8 (diff)
unify {de,}mangle_poll(), get rid of kernel-side POLL...
except, again, POLLFREE and POLL_BUSY_LOOP. With this, we finally get to the promised end result: - POLL{IN,OUT,...} are plain integers and *not* in __poll_t, so any stray instances of ->poll() still using those will be caught by sparse. - eventpoll.c and select.c warning-free wrt __poll_t - no more kernel-side definitions of POLL... - userland ones are visible through the entire kernel (and used pretty much only for mangle/demangle) - same behavior as after the first series (i.e. sparc et.al. epoll(2) working correctly). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/poll.h')
-rw-r--r--include/linux/poll.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/poll.h b/include/linux/poll.h
index d23104b32931..f45ebd017eaa 100644
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -108,4 +108,28 @@ extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
extern int poll_select_set_timeout(struct timespec64 *to, time64_t sec,
long nsec);
+#define __MAP(v, from, to) \
+ (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
+
+static inline __u16 mangle_poll(__poll_t val)
+{
+ __u16 v = (__force __u16)val;
+#define M(X) __MAP(v, (__force __u16)EPOLL##X, POLL##X)
+ return M(IN) | M(OUT) | M(PRI) | M(ERR) | M(NVAL) |
+ M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
+ M(HUP) | M(RDHUP) | M(MSG);
+#undef M
+}
+
+static inline __poll_t demangle_poll(u16 val)
+{
+#define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
+ return M(IN) | M(OUT) | M(PRI) | M(ERR) | M(NVAL) |
+ M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
+ M(HUP) | M(RDHUP) | M(MSG);
+#undef M
+}
+#undef __MAP
+
+
#endif /* _LINUX_POLL_H */

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