powerpc/powermac: Use early_* IO variants in via_calibrate_decr()

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[ Upstream commit 86582e6189 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Benjamin Gray 2023-07-06 11:08:16 +10:00 • committed by Greg Kroah-Hartman

parent ab3c602d15

commit ee66ee99ee

1 changed files with 3 additions and 3 deletions

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arch/powerpc/platforms/powermac/time.c

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