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authorDavid Howells <dhowells@redhat.com>2012-02-16 18:49:54 +0100
committerH. Peter Anvin <hpa@zytor.com>2012-02-19 19:30:57 +0100
commit1fd36adcd98c14d2fd97f545293c488775cb2823 (patch)
treec13ab1934a15aebe0d81601d910ce5a3c6fa2c6f /drivers/cpuidle
parentWrap accesses to the fd_sets in struct fdtable (diff)
downloadlinux-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 'drivers/cpuidle')
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