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sys: usermode: Document 0 size buffer memory check

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Documenting that 0 size buffer has undefined behavior.
See: https://github.com/zephyrproject-rtos/zephyr/pull/23239

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2020-03-06 14:45:16 -08:00 • committed by Johan Hedberg
commit 4b2fc256cf
1 changed files with 2 additions and 0 deletions
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include/sys/arch_interface.h
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@ -578,6 +578,8 @@ void arch_mem_domain_destroy(struct k_mem_domain *domain);
* if the supplied memory buffer spans multiple enabled memory management
* regions (even if all such regions permit user access).
*
* @warning 0 size buffer has undefined behavior.
*
* @param addr start address of the buffer
* @param size the size of the buffer
* @param write If nonzero, additionally check if the area is writable.