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authorChris Wilson <chris@chris-wilson.co.uk>2009-09-20 19:25:47 +0100
committerChris Wilson <chris@chris-wilson.co.uk>2009-09-23 01:05:26 +0100
commitab5ee57650165dc342a20d1213d48d585f2a72bd (patch)
tree7fd6e26d6a0a317df77234b8d5612f8b954070de /kernel/sysctl_binary.c
parentdrm/i915: Add tracepoints (diff)
drm/i915: Clean up evict from list.
First the routine attempted to unlock a mutex it did not own along the error path. Secondly the routine should never be called on any list but the inactive one, since we attempt to unbind those objects, so fix the calling semantics. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'kernel/sysctl_binary.c')
0 files changed, 0 insertions, 0 deletions
Copyright © 1996 – 2026 Jason A. Donenfeld. All Rights Reverse Engineered.
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# Simple Kconfig recursive issue
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#
# Test with:
#
# make KBUILD_KCONFIG=Documentation/kbuild/Kconfig.recursion-issue-01 allnoconfig
#
# This Kconfig file has a simple recursive dependency issue. In order to
# understand why this recursive dependency issue occurs lets consider what
# Kconfig needs to address. We iterate over what Kconfig needs to address
# by stepping through the questions it needs to address sequentially.
#
#  * What values are possible for CORE?
#
# CORE_BELL_A_ADVANCED selects CORE, which means that it influences the values
# that are possible for CORE. So for example if CORE_BELL_A_ADVANCED is 'y',
# CORE must be 'y' too.
#
#  * What influences CORE_BELL_A_ADVANCED ?
#
# As the name implies CORE_BELL_A_ADVANCED is an advanced feature of
# CORE_BELL_A so naturally it depends on CORE_BELL_A. So if CORE_BELL_A is 'y'
# we know CORE_BELL_A_ADVANCED can be 'y' too.
#
#   * What influences CORE_BELL_A ?
#
# CORE_BELL_A depends on CORE, so CORE influences CORE_BELL_A.
#
# But that is a problem, because this means that in order to determine
# what values are possible for CORE we ended up needing to address questions
# regarding possible values of CORE itself again. Answering the original
# question of what are the possible values of CORE would make the kconfig
# tools run in a loop. When this happens Kconfig exits and complains about
# the "recursive dependency detected" error.
#
# Reading the Documentation/kbuild/Kconfig.recursion-issue-01 file it may be
# obvious that an easy to solution to this problem should just be the removal
# of the "select CORE" from CORE_BELL_A_ADVANCED as that is implicit already
# since CORE_BELL_A depends on CORE. Recursive dependency issues are not always
# so trivial to resolve, we provide another example below of practical
# implications of this recursive issue where the solution is perhaps not so
# easy to understand. Note that matching semantics on the dependency on
# CORE also consist of a solution to this recursive problem.

mainmenu "Simple example to demo kconfig recursive dependency issue"

config CORE
	tristate

config CORE_BELL_A
	tristate
	depends on CORE

config CORE_BELL_A_ADVANCED
	tristate
	depends on CORE_BELL_A
	select CORE