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 ...
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| @@ -3,35 +3,49 @@ · 2 unmodified lines | |||
| 3 | #define __ASM_GENERIC_POLL_H | 3 | #define __ASM_GENERIC_POLL_H |
| 4 | 4 | ||
| 5 | /* These are specified by iBCS2 */ | 5 | /* These are specified by iBCS2 */ |
| 6 | #define POLLIN 0x0001 | 6 | #define POLLIN (__force __poll_t)0x0001 |
| 7 | #define POLLPRI 0x0002 | 7 | #define POLLPRI (__force __poll_t)0x0002 |
| 8 | #define POLLOUT 0x0004 | 8 | #define POLLOUT (__force __poll_t)0x0004 |
| 9 | #define POLLERR 0x0008 | 9 | #define POLLERR (__force __poll_t)0x0008 |
| 10 | #define POLLHUP 0x0010 | 10 | #define POLLHUP (__force __poll_t)0x0010 |
| 11 | #define POLLNVAL 0x0020 | 11 | #define POLLNVAL (__force __poll_t)0x0020 |
| 12 | 12 | ||
| 13 | /* The rest seem to be more-or-less nonstandard. Check them! */ | 13 | /* The rest seem to be more-or-less nonstandard. Check them! */ |
| 14 | #define POLLRDNORM 0x0040 | 14 | #define POLLRDNORM (__force __poll_t)0x0040 |
| 15 | #define POLLRDBAND 0x0080 | 15 | #define POLLRDBAND (__force __poll_t)0x0080 |
| 16 | #ifndef POLLWRNORM | 16 | #ifndef POLLWRNORM |
| 17 | #define POLLWRNORM 0x0100 | 17 | #define POLLWRNORM (__force __poll_t)0x0100 |
| 18 | #endif | 18 | #endif |
| 19 | #ifndef POLLWRBAND | 19 | #ifndef POLLWRBAND |
| 20 | #define POLLWRBAND 0x0200 | 20 | #define POLLWRBAND (__force __poll_t)0x0200 |
| 21 | #endif | 21 | #endif |
| 22 | #ifndef POLLMSG | 22 | #ifndef POLLMSG |
| 23 | #define POLLMSG 0x0400 | 23 | #define POLLMSG (__force __poll_t)0x0400 |
| 24 | #endif | 24 | #endif |
| 25 | #ifndef POLLREMOVE | 25 | #ifndef POLLREMOVE |
| 26 | #define POLLREMOVE 0x1000 | 26 | #define POLLREMOVE (__force __poll_t)0x1000 |
| 27 | #endif | 27 | #endif |
| 28 | #ifndef POLLRDHUP | 28 | #ifndef POLLRDHUP |
| 29 | #define POLLRDHUP 0x2000 | 29 | #define POLLRDHUP (__force __poll_t)0x2000 |
| 30 | #endif | 30 | #endif |
| 31 | 31 | ||
| 32 | #define POLLFREE 0x4000 /* currently only for epoll */ | 32 | #define POLLFREE (__force __poll_t)0x4000 /* currently only for epoll */ |
| 33 | 33 | ||
| 34 | #define POLL_BUSY_LOOP 0x8000 | 34 | #define POLL_BUSY_LOOP (__force __poll_t)0x8000 |
| 35 | |||
| 36 | #ifdef __KERNEL__ | ||
| 37 | #ifndef __ARCH_HAS_MANGLED_POLL | ||
| 38 | static inline __u16 mangle_poll(__poll_t val) | ||
| 39 | { | ||
| 40 | return (__force __u16)val; | ||
| 41 | } | ||
| 42 | |||
| 43 | static inline __poll_t demangle_poll(__u16 v) | ||
| 44 | { | ||
| 45 | return (__force __poll_t)v; | ||
| 46 | } | ||
| 47 | #endif | ||
| 48 | #endif | ||
| 35 | 49 | ||
| 36 | struct pollfd { | 50 | struct pollfd { |
| 37 | int fd; | 51 | int fd; |
| @@ -49,5 +49,11 @@ typedef __u32 __bitwise __wsum; · 48 unmodified lines | |||
| 49 | #define __aligned_be64 __be64 __attribute__((aligned(8))) | 49 | #define __aligned_be64 __be64 __attribute__((aligned(8))) |
| 50 | #define __aligned_le64 __le64 __attribute__((aligned(8))) | 50 | #define __aligned_le64 __le64 __attribute__((aligned(8))) |
| 51 | 51 | ||
| 52 | #ifdef __CHECK_POLL | ||
| 53 | typedef unsigned __bitwise __poll_t; | ||
| 54 | #else | ||
| 55 | typedef unsigned __poll_t; | ||
| 56 | #endif | ||
| 57 | |||
| 52 | #endif /* __ASSEMBLY__ */ | 58 | #endif /* __ASSEMBLY__ */ |
| 53 | #endif /* _UAPI_LINUX_TYPES_H */ | 59 | #endif /* _UAPI_LINUX_TYPES_H */ |