tree 26135abe7de23dda7372d68317574dfa20a9fe6c
parent c5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8
author Christophe Leroy <christophe.leroy@csgroup.eu> 1618925568 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1620978642 +0200

powerpc/64: Fix the definition of the fixmap area

[ Upstream commit 9ccba66d4d2aff9a3909aa77d57ea8b7cc166f3c ]

At the time being, the fixmap area is defined at the top of
the address space or just below KASAN.

This definition is not valid for PPC64.

For PPC64, use the top of the I/O space.

Because of circular dependencies, it is not possible to include
asm/fixmap.h in asm/book3s/64/pgtable.h , so define a fixed size
AREA at the top of the I/O space for fixmap and ensure during
build that the size is big enough.

Fixes: 265c3491c4bc ("powerpc: Add support for GENERIC_EARLY_IOREMAP")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0d51620eacf036d683d1a3c41328f69adb601dc0.1618925560.git.christophe.leroy@csgroup.eu
Signed-off-by: Sasha Levin <sashal@kernel.org>