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um: Add compile time assert that stub fits on a page

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The code assumes that the stub code can fit into a single page. This is
unlikely to ever change, but add a link time assert instead so that
there will be no hard to debug error.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240919124511.282088-6-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Benjamin Berg 2024-09-19 14:45:06 +02:00 committed by Johannes Berg
parent fdb2ecd35d
commit 77eb31b600
1 changed files with 3 additions and 0 deletions
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3
arch/um/kernel/dyn.lds.S
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@ -178,3 +178,6 @@ SECTIONS
DISCARDS
}
ASSERT(__syscall_stub_end - __syscall_stub_start <= PAGE_SIZE,
"STUB code must not be larger than one page");