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author | Rik van Riel <riel@surriel.com> | 2018-07-16 15:03:31 -0400 |
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committer | Ingo Molnar <mingo@kernel.org> | 2018-07-17 09:35:30 +0200 |
commit | c1a2f7f0c06454387c2cd7b93ff1491c715a8c69 (patch) | |
tree | f3b3cce7e45b2bab54681b23a3947a445ae38a37 /arch/x86/include/asm/kvm_emulate.h | |
parent | 37c45b2354cb2270f246679bedd8bf798cca351c (diff) | |
download | linux-stable-c1a2f7f0c06454387c2cd7b93ff1491c715a8c69.tar.gz linux-stable-c1a2f7f0c06454387c2cd7b93ff1491c715a8c69.tar.bz2 linux-stable-c1a2f7f0c06454387c2cd7b93ff1491c715a8c69.zip |
mm: Allocate the mm_cpumask (mm->cpu_bitmap[]) dynamically based on nr_cpu_ids
The mm_struct always contains a cpumask bitmap, regardless of
CONFIG_CPUMASK_OFFSTACK. That means the first step can be to
simplify things, and simply have one bitmask at the end of the
mm_struct for the mm_cpumask.
This does necessitate moving everything else in mm_struct into
an anonymous sub-structure, which can be randomized when struct
randomization is enabled.
The second step is to determine the correct size for the
mm_struct slab object from the size of the mm_struct
(excluding the CPU bitmap) and the size the cpumask.
For init_mm we can simply allocate the maximum size this
kernel is compiled for, since we only have one init_mm
in the system, anyway.
Pointer magic by Mike Galbraith, to evade -Wstringop-overflow
getting confused by the dynamically sized array.
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Rik van Riel <riel@surriel.com>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-team@fb.com
Cc: luto@kernel.org
Link: http://lkml.kernel.org/r/20180716190337.26133-2-riel@surriel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/kvm_emulate.h')
0 files changed, 0 insertions, 0 deletions