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vtime: Add HAVE_VIRT_CPU_ACCOUNTING_GEN Kconfig

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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 <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Russell King <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Arm Linux <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
This commit is contained in:
Kevin Hilman 2013-09-16 15:28:21 -07:00 • committed by Frederic Weisbecker
commit 554b0004d0
3 changed files with 14 additions and 0 deletions
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12
arch/Kconfig
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@ -353,6 +353,18 @@ config HAVE_CONTEXT_TRACKING
config HAVE_VIRT_CPU_ACCOUNTING
bool
config HAVE_VIRT_CPU_ACCOUNTING_GEN
bool
default y if 64BIT
help
With VIRT_CPU_ACCOUNTING_GEN, cputime_t becomes 64-bit.
Before enabling this option, arch code must 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, so proper
locking is needed to protect against concurrent accesses.
config HAVE_IRQ_TIME_ACCOUNTING
bool
help