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Kernel: Add the ability to verify we don't kmalloc under spinlock.

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Ideally we would never allocate under a spinlock, as it has many
performance and potentially functionality (deadlock) pitfalls.

We violate that rule in many places today, but we need a tool to track
them all down and fix them. This change introduces a new macro option
named `KMALLOC_VERIFY_NO_SPINLOCK_HELD` which can catch these
situations at runtime via an assert.
This commit is contained in:
Brian Gianforcaro 2021-05-14 04:09:06 -07:00 • committed by Andreas Kling
parent 6329e9fce6
commit 9c38475608
3 changed files with 18 additions and 0 deletions
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4
Kernel/Debug.h.in
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@ -134,6 +134,10 @@
#cmakedefine01 KMALLOC_DEBUG
#endif
#ifndef KMALLOC_VERIFY_NO_SPINLOCK_HELD
#cmakedefine01 KMALLOC_VERIFY_NO_SPINLOCK_HELD
#endif
#ifndef LOCAL_SOCKET_DEBUG
#cmakedefine01 LOCAL_SOCKET_DEBUG
#endif