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authorJosh Boyer <jwboyer@redhat.com>2012-07-25 10:40:34 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-26 13:36:43 -0700
commit8ded2bbc1845e19c771eb55209aab166ef011243 (patch)
tree9ab400cdd407a9426fdfcc3432d7c0e19a0607ed /fs/select.c
parent4cb38750d49010ae72e718d46605ac9ba5a851b4 (diff)
downloadop-kernel-dev-8ded2bbc1845e19c771eb55209aab166ef011243.zip
op-kernel-dev-8ded2bbc1845e19c771eb55209aab166ef011243.tar.gz
posix_types.h: Cleanup stale __NFDBITS and related definitions
Recently, glibc made a change to suppress sign-conversion warnings in FD_SET (glibc commit ceb9e56b3d1). This uncovered an issue with the kernel's definition of __NFDBITS if applications #include <linux/types.h> after including <sys/select.h>. A build failure would be seen when passing the -Werror=sign-compare and -D_FORTIFY_SOURCE=2 flags to gcc. It was suggested that the kernel should either match the glibc definition of __NFDBITS or remove that entirely. The current in-kernel uses of __NFDBITS can be replaced with BITS_PER_LONG, and there are no uses of the related __FDELT and __FDMASK defines. Given that, we'll continue the cleanup that was started with commit 8b3d1cda4f5f ("posix_types: Remove fd_set macros") and drop the remaining unused macros. Additionally, linux/time.h has similar macros defined that expand to nothing so we'll remove those at the same time. Reported-by: Jeff Law <law@redhat.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> CC: <stable@vger.kernel.org> Signed-off-by: Josh Boyer <jwboyer@redhat.com> [ .. and fix up whitespace as per akpm ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/select.c')
-rw-r--r--fs/select.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/select.c b/fs/select.c
index bae3215..db14c78 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -345,8 +345,8 @@ static int max_select_fd(unsigned long n, fd_set_bits *fds)
struct fdtable *fdt;
/* handle last in-complete long-word first */
- set = ~(~0UL << (n & (__NFDBITS-1)));
- n /= __NFDBITS;
+ set = ~(~0UL << (n & (BITS_PER_LONG-1)));
+ n /= BITS_PER_LONG;
fdt = files_fdtable(current->files);
open_fds = fdt->open_fds + n;
max = 0;
@@ -373,7 +373,7 @@ get_max:
max++;
set >>= 1;
} while (set);
- max += n * __NFDBITS;
+ max += n * BITS_PER_LONG;
}
return max;
@@ -435,11 +435,11 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
in = *inp++; out = *outp++; ex = *exp++;
all_bits = in | out | ex;
if (all_bits == 0) {
- i += __NFDBITS;
+ i += BITS_PER_LONG;
continue;
}
- for (j = 0; j < __NFDBITS; ++j, ++i, bit <<= 1) {
+ for (j = 0; j < BITS_PER_LONG; ++j, ++i, bit <<= 1) {
int fput_needed;
if (i >= n)
break;
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