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| author | Kevin Hilman <khilman@linaro.org> | 2013-09-16 15:28:21 -0700 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-09-30 15:35:53 +0200 |
| commit | 554b0004d0ec4fbd11e08668dfc400f211e8d5c5 (patch) | |
| tree | 962305270252e407cd887ba9ed949bde346b8f81 /kernel/time | |
| parent | 15c03dd4859ab16f9212238f29dd315654aa94f6 (diff) | |
| download | op-kernel-dev-554b0004d0ec4fbd11e08668dfc400f211e8d5c5.zip op-kernel-dev-554b0004d0ec4fbd11e08668dfc400f211e8d5c5.tar.gz | |
vtime: Add HAVE_VIRT_CPU_ACCOUNTING_GEN Kconfig
With VIRT_CPU_ACCOUNTING_GEN, cputime_t becomes 64-bit. In order
to use that feature, arch code should be audited to ensure there are no
races in concurrent read/write of cputime_t. For example,
reading/writing 64-bit cputime_t on some 32-bit arches may require
multiple accesses for low and high value parts, so proper locking
is needed to protect against concurrent accesses.
Therefore, add CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN which arches can
enable after they've been audited for potential races.
This option is automatically enabled on 64-bit platforms.
Feature requested by Frederic Weisbecker.
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Arm Linux <linux-arm-kernel@lists.infradead.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 2b62fe8..f148475 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -101,6 +101,7 @@ config NO_HZ_FULL depends on HAVE_CONTEXT_TRACKING # VIRT_CPU_ACCOUNTING_GEN dependency depends on 64BIT + depends on HAVE_VIRT_CPU_ACCOUNTING_GEN select NO_HZ_COMMON select RCU_USER_QS select RCU_NOCB_CPU |
