On a powermac platform, via the call path:
start_kernel()
time_init()
ppc_md.calibrate_decr() (pmac_calibrate_decr)
via_calibrate_decr()
ioremap() and iounmap() are called. The unmap can enable interrupts
unexpectedly (cond_resched() in vunmap_pmd_range()), which causes a
warning later in the boot sequence in start_kernel().
Use the early_* variants of these IO functions to prevent this.
The issue is pre-existing, but is surfaced by commit 721255b982
("genirq: Use a maple tree for interrupt descriptor management").
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230706010816.72682-1-bgray@linux.ibm.com
86582e6189