On Wed, 25 Feb 2015 16:39:44 +0800 , Hanjun Guo <hanjun.guo@xxxxxxxxxx> wrote: > From: Mark Salter <msalter@xxxxxxxxxx> > > Commit 0e63ea48b4d8 (arm64/efi: add missing call to early_ioremap_reset()) > added a missing call to early_ioremap_reset(). This triggers a BUG if code > tries using early_ioremap() after the early_ioremap_reset(). This is a > problem for some ACPI code which needs short-lived temporary mappings > after paging_init() but before acpi_early_init() in start_kernel(). This > patch adds definitions for the __late_set_fixmap() and __late_clear_fixmap() > which avoids the BUG by allowing later use of early_ioremap(). > > CC: Leif Lindholm <leif.lindholm@xxxxxxxxxx> > CC: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> > Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx> > Tested-by: Jon Masters <jcm@xxxxxxxxxx> > Tested-by: Robert Richter <rrichter@xxxxxxxxxx> > Acked-by: Robert Richter <rrichter@xxxxxxxxxx> > Signed-off-by: Mark Salter <msalter@xxxxxxxxxx> > Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx> Reviewed-by: Grant Likely <grant.likely@xxxxxxxxxx> > --- > arch/arm64/include/asm/fixmap.h | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h > index defa0ff9..f196e40 100644 > --- a/arch/arm64/include/asm/fixmap.h > +++ b/arch/arm64/include/asm/fixmap.h > @@ -62,6 +62,9 @@ void __init early_fixmap_init(void); > > #define __early_set_fixmap __set_fixmap > > +#define __late_set_fixmap __set_fixmap > +#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) > + > extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); > > #include <asm-generic/fixmap.h> > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
