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| author | mike.travis@hpe.com <mike.travis@hpe.com> | 2018-05-24 15:17:12 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-06-21 16:14:45 +0200 |
| commit | f642fb5864a6e3645edce6f85ffe7b44d5e9b990 (patch) | |
| tree | 19a7f8246d6272e218d9c4565f273666ba6cd3d2 /include/linux/memory.h | |
| parent | d6605b6bbee88b74150b14f5e83a6067f5e323d2 (diff) | |
| download | linux-f642fb5864a6e3645edce6f85ffe7b44d5e9b990.tar.gz linux-f642fb5864a6e3645edce6f85ffe7b44d5e9b990.tar.bz2 linux-f642fb5864a6e3645edce6f85ffe7b44d5e9b990.zip | |
x86/platform/UV: Add adjustable set memory block size function
Add a new function to "adjust" the current fixed UV memory block size
of 2GB so it can be changed to a different physical boundary. This is
out of necessity so arch dependent code can accommodate specific BIOS
requirements which can align these new PMEM modules at less than the
default boundaries.
A "set order" type of function was used to insure that the memory block
size will be a power of two value without requiring a validity check.
64GB was chosen as the upper limit for memory block size values to
accommodate upcoming 4PB systems which have 6 more bits of physical
address space (46 becoming 52).
Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Andrew Banman <andrew.banman@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dan.j.williams@intel.com
Cc: jgross@suse.com
Cc: kirill.shutemov@linux.intel.com
Cc: mhocko@suse.com
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/lkml/20180524201711.609546602@stormcage.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/memory.h')
| -rw-r--r-- | include/linux/memory.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h index 31ca3e28b0eb..a6ddefc60517 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -38,6 +38,7 @@ struct memory_block { int arch_get_memory_phys_device(unsigned long start_pfn); unsigned long memory_block_size_bytes(void); +int set_memory_block_size_order(unsigned int order); /* These states are exposed to userspace as text strings in sysfs */ #define MEM_ONLINE (1<<0) /* exposed to userspace */ |