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Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull poll annotations from Al Viro:
 "This introduces a __bitwise type for POLL### bitmap, and propagates
  the annotations through the tree. Most of that stuff is as simple as
  'make ->poll() instances return __poll_t and do the same to local
  variables used to hold the future return value'.

  Some of the obvious brainos found in process are fixed (e.g. POLLIN
  misspelled as POLL_IN). At that point the amount of sparse warnings is
  low and most of them are for genuine bugs - e.g. ->poll() instance
  deciding to return -EINVAL instead of a bitmap. I hadn't touched those
  in this series - it's large enough as it is.

  Another problem it has caught was eventpoll() ABI mess; select.c and
  eventpoll.c assumed that corresponding POLL### and EPOLL### were
  equal. That's true for some, but not all of them - EPOLL### are
  arch-independent, but POLL### are not.

  The last commit in this series separates userland POLL### values from
  the (now arch-independent) kernel-side ones, converting between them
  in the few places where they are copied to/from userland. AFAICS, this
  is the least disruptive fix preserving poll(2) ABI and making epoll()
  work on all architectures.

  As it is, it's simply broken on sparc - try to give it EPOLLWRNORM and
  it will trigger only on what would've triggered EPOLLWRBAND on other
  architectures. EPOLLWRBAND and EPOLLRDHUP, OTOH, are never triggered
  at all on sparc. With this patch they should work consistently on all
  architectures"

* 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (37 commits)
  make kernel-side POLL... arch-independent
  eventpoll: no need to mask the result of epi_item_poll() again
  eventpoll: constify struct epoll_event pointers
  debugging printk in sg_poll() uses %x to print POLL... bitmap
  annotate poll(2) guts
  9p: untangle ->poll() mess
  ->si_band gets POLL... bitmap stored into a user-visible long field
  ring_buffer_poll_wait() return value used as return value of ->poll()
  the rest of drivers/*: annotate ->poll() instances
  media: annotate ->poll() instances
  fs: annotate ->poll() instances
  ipc, kernel, mm: annotate ->poll() instances
  net: annotate ->poll() instances
  apparmor: annotate ->poll() instances
  tomoyo: annotate ->poll() instances
  sound: annotate ->poll() instances
  acpi: annotate ->poll() instances
  crypto: annotate ->poll() instances
  block: annotate ->poll() instances
  x86: annotate ->poll() instances
  ...
This commit is contained in:
Linus Torvalds
2018-01-30 17:58:07 -08:00
parent 13ddd1667e c71d227fc4
commit 168fe32a07
387 changed files with 928 additions and 810 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
arch/sparc/include/uapi/asm/poll.h
View File

@@ -2,11 +2,31 @@
#ifndef __SPARC_POLL_H
#define __SPARC_POLL_H
#ifndef __KERNEL__
#define POLLWRNORM POLLOUT
#define POLLWRBAND 256
#define POLLMSG 512
#define POLLREMOVE 1024
#define POLLRDHUP 2048
#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>