linux-stable/arch/powerpc/include
Gautham R. Shenoy 2299d03a63 powerpc: powernv: Framework to show the correct clock in /proc/cpuinfo
Currently, the code in setup-common.c for powerpc assumes that all
clock rates are same in a smp system. This value is cached in the
variable named ppc_proc_freq and is the value that is reported in
/proc/cpuinfo.

However on the PowerNV platform, the clock rate is same only across
the threads of the same core. Hence the value that is reported in
/proc/cpuinfo is incorrect on PowerNV platforms. We need a better way
to query and report the correct value of the processor clock in
/proc/cpuinfo.

The patch achieves this by creating a machdep_call named
get_proc_freq() which is expected to returns the frequency in Hz. The
code in show_cpuinfo() can invoke this method to display the correct
clock rate on platforms that have implemented this method. On the
other powerpc platforms it can use the value cached in ppc_proc_freq.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:38 +10:00
..
asm powerpc: powernv: Framework to show the correct clock in /proc/cpuinfo 2014-04-28 17:36:38 +10:00
uapi/asm powerpc: Bump COMMAND_LINE_SIZE to 2048 2014-04-28 16:31:58 +10:00