| Message ID | 20190517164746.110786-5-swboyd@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Read-only memremap() proposal | expand |
On Fri, May 17, 2019 at 09:47:45AM -0700, Stephen Boyd wrote: > Pass in PAGE_KERNEL_RO to the underlying IO mapping mechanism to get a > read-only mapping for the MEMREMAP_RO type of memory mappings that > memremap() supports. > > Cc: Evan Green <evgreen@chromium.org> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org> > Cc: Andy Gross <agross@kernel.org> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Dan Williams <dan.j.williams@intel.com> > Signed-off-by: Stephen Boyd <swboyd@chromium.org> Not sure what the plans are with this series but if you need an ack for arm64: Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Quoting Catalin Marinas (2019-06-03 08:56:13) > On Fri, May 17, 2019 at 09:47:45AM -0700, Stephen Boyd wrote: > > Pass in PAGE_KERNEL_RO to the underlying IO mapping mechanism to get a > > read-only mapping for the MEMREMAP_RO type of memory mappings that > > memremap() supports. > > > > Cc: Evan Green <evgreen@chromium.org> > > Cc: Rob Herring <robh+dt@kernel.org> > > Cc: Bjorn Andersson <bjorn.andersson@linaro.org> > > Cc: Andy Gross <agross@kernel.org> > > Cc: Will Deacon <will.deacon@arm.com> > > Cc: Catalin Marinas <catalin.marinas@arm.com> > > Cc: Dan Williams <dan.j.williams@intel.com> > > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > > Not sure what the plans are with this series but if you need an ack for > arm64: > > Acked-by: Catalin Marinas <catalin.marinas@arm.com> Thanks. I'll resend without the RFC tag and see how it goes.
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 8bb7210ac286..245bd371e8dc 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -185,6 +185,7 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size); #define ioremap_nocache(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) #define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC)) #define ioremap_wt(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) +#define arch_memremap_ro(addr, size) __ioremap((addr), (size), PAGE_KERNEL_RO) #define iounmap __iounmap /*
Pass in PAGE_KERNEL_RO to the underlying IO mapping mechanism to get a read-only mapping for the MEMREMAP_RO type of memory mappings that memremap() supports. Cc: Evan Green <evgreen@chromium.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Andy Gross <agross@kernel.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Stephen Boyd <swboyd@chromium.org> --- arch/arm64/include/asm/io.h | 1 + 1 file changed, 1 insertion(+)