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Subject[PATCH v3 0/2] provide the flexibility to enable KFENCE
This is v3 for (re-)enabling KFENCE.

If CONFIG_CONTIG_ALLOC is not supported, we fallback to try
alloc_pages_exact(). Allocating pages in this way has limits about
MAX_ORDER (default 11). So we will not support allocating kfence pool
after system startup with a large KFENCE_NUM_OBJECTS.

When handling failures in kfence_init_pool_late(), we pair
free_pages_exact() to alloc_pages_exact() for compatibility
consideration, though it actually does the same as free_contig_range().

Use alloc_pages_exact() instead of alloc_contig_pages()
if CONFIG_CONTIG_ALLOC is not defined.

Take KFENCE_WARN_ON() into account. Do not allow re-enabling KFENCE
if it once disabled by warn.
Modify func names and comments.


Tianchen Ding (2):
kfence: Allow re-enabling KFENCE after system startup
kfence: Alloc kfence_pool after system startup

mm/kfence/core.c | 126 +++++++++++++++++++++++++++++++++++++++--------
1 file changed, 105 insertions(+), 21 deletions(-)


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