From mboxrd@z Thu Jan 1 00:00:00 1970 From: opendmb@gmail.com (Doug Berger) Date: Tue, 27 Jun 2017 19:44:02 -0700 Subject: [PATCH] ARM: small correction to early_ioremap support In-Reply-To: <20170627005731.7869-1-opendmb@gmail.com> References: <20170627005731.7869-1-opendmb@gmail.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 06/26/2017 05:57 PM, Doug Berger wrote: > The fixmap pages need to be on the same pmd page for the current > implementation of arm early_fixmap. A build time bug check is > used to ensure that. However, the worst case fixmap range is > better represented by __end_of_fixed_addresses than by the value > __end_of_early_ioremap_region. I see now that only the early_ioremap portion of the fixmap needs to be on the same pmd page and not the entire collection of fixmap pages. Therefore the check against __end_of_early_ioremap_region is the correct choice for this build time check. Please disregard this patch. Sorry for the confusion, Doug > > Fixes: 2937367b8a4b ("ARM: add support for generic early_ioremap/early_memremap") > Signed-off-by: Doug Berger > --- > arch/arm/mm/mmu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c > index 31af3cb59a60..74c0ed5c3b08 100644 > --- a/arch/arm/mm/mmu.c > +++ b/arch/arm/mm/mmu.c > @@ -392,7 +392,7 @@ void __init early_fixmap_init(void) > * The early fixmap range spans multiple pmds, for which > * we are not prepared: > */ > - BUILD_BUG_ON((__fix_to_virt(__end_of_early_ioremap_region) >> PMD_SHIFT) > + BUILD_BUG_ON((__fix_to_virt(__end_of_fixed_addresses) >> PMD_SHIFT) > != FIXADDR_TOP >> PMD_SHIFT); > > pmd = fixmap_pmd(FIXADDR_TOP); >