diff options
author | David Howells <dhowells@redhat.com> | 2012-02-16 18:49:54 +0100 |
---|---|---|
committer | H. Peter Anvin <hpa@zytor.com> | 2012-02-19 19:30:57 +0100 |
commit | 1fd36adcd98c14d2fd97f545293c488775cb2823 (patch) | |
tree | c13ab1934a15aebe0d81601d910ce5a3c6fa2c6f /kernel/exit.c | |
parent | Wrap accesses to the fd_sets in struct fdtable (diff) | |
download | linux-1fd36adcd98c14d2fd97f545293c488775cb2823.tar.xz linux-1fd36adcd98c14d2fd97f545293c488775cb2823.zip |
Replace the fd_sets in struct fdtable with an array of unsigned longs
Replace the fd_sets in struct fdtable with an array of unsigned longs and then
use the standard non-atomic bit operations rather than the FD_* macros.
This:
(1) Removes the abuses of struct fd_set:
(a) Since we don't want to allocate a full fd_set the vast majority of the
time, we actually, in effect, just allocate a just-big-enough array of
unsigned longs and cast it to an fd_set type - so why bother with the
fd_set at all?
(b) Some places outside of the core fdtable handling code (such as
SELinux) want to look inside the array of unsigned longs hidden inside
the fd_set struct for more efficient iteration over the entire set.
(2) Eliminates the use of FD_*() macros in the kernel completely.
(3) Permits the __FD_*() macros to be deleted entirely where not exposed to
userspace.
Signed-off-by: David Howells <dhowells@redhat.com>
Link: http://lkml.kernel.org/r/20120216174954.23314.48147.stgit@warthog.procyon.org.uk
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r-- | kernel/exit.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 4b4042f9bc6a..4db020015f14 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -473,7 +473,7 @@ static void close_files(struct files_struct * files) i = j * __NFDBITS; if (i >= fdt->max_fds) break; - set = fdt->open_fds->fds_bits[j++]; + set = fdt->open_fds[j++]; while (set) { if (set & 1) { struct file * file = xchg(&fdt->fd[i], NULL); |