| Message ID | 20230921110424.215592-4-bhe@redhat.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | None | expand |
On Thu, Sep 21, 2023, at 07:04, Baoquan He wrote: > ioremap_uc() is only meaningful on old x86-32 systems with the PAT > extension, and on ia64 with its slightly unconventional ioremap() > behavior. So remove the ioremap_uc() definition in architecutures > other than x86 and ia64. These architectures all have asm-generic/io.h > included and will have the default ioremap_uc() definition which > returns NULL. > > This changes the existing behaviour, while no need to worry about > any breakage because in the only callsite of ioremap_uc(), code > has been adjusted to eliminate the impact. Please see > atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c. > > If any new invocation of ioremap_uc() need be added, please consider > using ioremap() intead or adding a ARCH specific version if necessary. > > Signed-off-by: Baoquan He <bhe@redhat.com> > Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> > Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) > Acked-by: Helge Deller <deller@gmx.de> # parisc > Cc: linux-alpha@vger.kernel.org > Cc: linux-hexagon@vger.kernel.org > Cc: linux-m68k@lists.linux-m68k.org > Cc: linux-mips@vger.kernel.org > Cc: linux-parisc@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-sh@vger.kernel.org > Cc: sparclinux@vger.kernel.org Acked-by: Arnd Bergmann <arnd@arndb.de>
On Thu, Sep 21, 2023 at 07:04:23PM +0800, Baoquan He wrote: > ioremap_uc() is only meaningful on old x86-32 systems with the PAT > extension, and on ia64 with its slightly unconventional ioremap() > behavior. So remove the ioremap_uc() definition in architecutures > other than x86 and ia64. These architectures all have asm-generic/io.h > included and will have the default ioremap_uc() definition which > returns NULL. > > This changes the existing behaviour, while no need to worry about > any breakage because in the only callsite of ioremap_uc(), code > has been adjusted to eliminate the impact. Please see > atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c. > > If any new invocation of ioremap_uc() need be added, please consider > using ioremap() intead or adding a ARCH specific version if necessary. > > Signed-off-by: Baoquan He <bhe@redhat.com> > Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> > Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) > Acked-by: Helge Deller <deller@gmx.de> # parisc > Cc: linux-alpha@vger.kernel.org > Cc: linux-hexagon@vger.kernel.org > Cc: linux-m68k@lists.linux-m68k.org > Cc: linux-mips@vger.kernel.org > Cc: linux-parisc@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-sh@vger.kernel.org > Cc: sparclinux@vger.kernel.org > --- > Documentation/driver-api/device-io.rst | 9 +++++---- > arch/alpha/include/asm/io.h | 1 - > arch/hexagon/include/asm/io.h | 3 --- > arch/m68k/include/asm/kmap.h | 1 - > arch/mips/include/asm/io.h | 1 - Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
On Thu, 2023-09-21 at 19:04 +0800, Baoquan He wrote: > ioremap_uc() is only meaningful on old x86-32 systems with the PAT > extension, and on ia64 with its slightly unconventional ioremap() > behavior. So remove the ioremap_uc() definition in architecutures > other than x86 and ia64. These architectures all have asm-generic/io.h > included and will have the default ioremap_uc() definition which > returns NULL. > > This changes the existing behaviour, while no need to worry about > any breakage because in the only callsite of ioremap_uc(), code > has been adjusted to eliminate the impact. Please see > atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c. > > If any new invocation of ioremap_uc() need be added, please consider > using ioremap() intead or adding a ARCH specific version if necessary. > > Signed-off-by: Baoquan He <bhe@redhat.com> > Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> > Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) > Acked-by: Helge Deller <deller@gmx.de> # parisc > Cc: linux-alpha@vger.kernel.org > Cc: linux-hexagon@vger.kernel.org > Cc: linux-m68k@lists.linux-m68k.org > Cc: linux-mips@vger.kernel.org > Cc: linux-parisc@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-sh@vger.kernel.org > Cc: sparclinux@vger.kernel.org > --- > Documentation/driver-api/device-io.rst | 9 +++++---- > arch/alpha/include/asm/io.h | 1 - > arch/hexagon/include/asm/io.h | 3 --- > arch/m68k/include/asm/kmap.h | 1 - > arch/mips/include/asm/io.h | 1 - > arch/parisc/include/asm/io.h | 2 -- > arch/powerpc/include/asm/io.h | 1 - > arch/sh/include/asm/io.h | 2 -- > arch/sparc/include/asm/io_64.h | 1 - > 9 files changed, 5 insertions(+), 16 deletions(-) > > diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst > index 2c7abd234f4e..d55384b106bd 100644 > --- a/Documentation/driver-api/device-io.rst > +++ b/Documentation/driver-api/device-io.rst > @@ -408,11 +408,12 @@ functions for details on the CPU side of things. > ioremap_uc() > ------------ > > -ioremap_uc() behaves like ioremap() except that on the x86 architecture without > -'PAT' mode, it marks memory as uncached even when the MTRR has designated > -it as cacheable, see Documentation/arch/x86/pat.rst. > +ioremap_uc() is only meaningful on old x86-32 systems with the PAT extension, > +and on ia64 with its slightly unconventional ioremap() behavior, everywhere > +elss ioremap_uc() defaults to return NULL. > > -Portable drivers should avoid the use of ioremap_uc(). > + > +Portable drivers should avoid the use of ioremap_uc(), use ioremap() instead. > > ioremap_cache() > --------------- > diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h > index 7aeaf7c30a6f..076f0e4e7f1e 100644 > --- a/arch/alpha/include/asm/io.h > +++ b/arch/alpha/include/asm/io.h > @@ -308,7 +308,6 @@ static inline void __iomem *ioremap(unsigned long port, unsigned long size) > } > > #define ioremap_wc ioremap > -#define ioremap_uc ioremap > > static inline void iounmap(volatile void __iomem *addr) > { > diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h > index e2b308e32a37..b7bc246dbcb1 100644 > --- a/arch/hexagon/include/asm/io.h > +++ b/arch/hexagon/include/asm/io.h > @@ -174,9 +174,6 @@ static inline void writel(u32 data, volatile void __iomem *addr) > #define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ > (__HEXAGON_C_DEV << 6)) > > -#define ioremap_uc(addr, size) ioremap((addr), (size)) > - > - > #define __raw_writel writel > > static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, > diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h > index 4efb3efa593a..b778f015c917 100644 > --- a/arch/m68k/include/asm/kmap.h > +++ b/arch/m68k/include/asm/kmap.h > @@ -25,7 +25,6 @@ static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size) > return __ioremap(physaddr, size, IOMAP_NOCACHE_SER); > } > > -#define ioremap_uc ioremap > #define ioremap_wt ioremap_wt > static inline void __iomem *ioremap_wt(unsigned long physaddr, > unsigned long size) > diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h > index 41d8bd5adef8..1ecf255efb40 100644 > --- a/arch/mips/include/asm/io.h > +++ b/arch/mips/include/asm/io.h > @@ -170,7 +170,6 @@ void iounmap(const volatile void __iomem *addr); > */ > #define ioremap(offset, size) \ > ioremap_prot((offset), (size), _CACHE_UNCACHED) > -#define ioremap_uc ioremap > > /* > * ioremap_cache - map bus memory into CPU space > diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h > index 366537042465..48630c78714a 100644 > --- a/arch/parisc/include/asm/io.h > +++ b/arch/parisc/include/asm/io.h > @@ -132,8 +132,6 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr) > > #define ioremap_wc(addr, size) \ > ioremap_prot((addr), (size), _PAGE_IOREMAP) > -#define ioremap_uc(addr, size) \ > - ioremap_prot((addr), (size), _PAGE_IOREMAP) > > #define pci_iounmap pci_iounmap > > diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h > index 0732b743e099..21bd3e8bffce 100644 > --- a/arch/powerpc/include/asm/io.h > +++ b/arch/powerpc/include/asm/io.h > @@ -900,7 +900,6 @@ void __iomem *ioremap_wt(phys_addr_t address, unsigned long size); > #endif > > void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size); > -#define ioremap_uc(addr, size) ioremap((addr), (size)) > #define ioremap_cache(addr, size) \ > ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL)) > > diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h > index f2f38e9d489a..790bea22c9b5 100644 > --- a/arch/sh/include/asm/io.h > +++ b/arch/sh/include/asm/io.h > @@ -302,8 +302,6 @@ unsigned long long poke_real_address_q(unsigned long long addr, > ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL)) > #endif /* CONFIG_MMU */ > > -#define ioremap_uc ioremap > - > /* > * Convert a physical pointer to a virtual kernel pointer for /dev/mem > * access > diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h > index 9303270b22f3..d8ee1442f303 100644 > --- a/arch/sparc/include/asm/io_64.h > +++ b/arch/sparc/include/asm/io_64.h > @@ -423,7 +423,6 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size) > return (void __iomem *)offset; > } > > -#define ioremap_uc(X,Y) ioremap((X),(Y)) > #define ioremap_wc(X,Y) ioremap((X),(Y)) > #define ioremap_wt(X,Y) ioremap((X),(Y)) > static inline void __iomem *ioremap_np(unsigned long offset, unsigned long size) Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> (SuperH)
diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst index 2c7abd234f4e..d55384b106bd 100644 --- a/Documentation/driver-api/device-io.rst +++ b/Documentation/driver-api/device-io.rst @@ -408,11 +408,12 @@ functions for details on the CPU side of things. ioremap_uc() ------------ -ioremap_uc() behaves like ioremap() except that on the x86 architecture without -'PAT' mode, it marks memory as uncached even when the MTRR has designated -it as cacheable, see Documentation/arch/x86/pat.rst. +ioremap_uc() is only meaningful on old x86-32 systems with the PAT extension, +and on ia64 with its slightly unconventional ioremap() behavior, everywhere +elss ioremap_uc() defaults to return NULL. -Portable drivers should avoid the use of ioremap_uc(). + +Portable drivers should avoid the use of ioremap_uc(), use ioremap() instead. ioremap_cache() --------------- diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h index 7aeaf7c30a6f..076f0e4e7f1e 100644 --- a/arch/alpha/include/asm/io.h +++ b/arch/alpha/include/asm/io.h @@ -308,7 +308,6 @@ static inline void __iomem *ioremap(unsigned long port, unsigned long size) } #define ioremap_wc ioremap -#define ioremap_uc ioremap static inline void iounmap(volatile void __iomem *addr) { diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h index e2b308e32a37..b7bc246dbcb1 100644 --- a/arch/hexagon/include/asm/io.h +++ b/arch/hexagon/include/asm/io.h @@ -174,9 +174,6 @@ static inline void writel(u32 data, volatile void __iomem *addr) #define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ (__HEXAGON_C_DEV << 6)) -#define ioremap_uc(addr, size) ioremap((addr), (size)) - - #define __raw_writel writel static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h index 4efb3efa593a..b778f015c917 100644 --- a/arch/m68k/include/asm/kmap.h +++ b/arch/m68k/include/asm/kmap.h @@ -25,7 +25,6 @@ static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size) return __ioremap(physaddr, size, IOMAP_NOCACHE_SER); } -#define ioremap_uc ioremap #define ioremap_wt ioremap_wt static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size) diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index 41d8bd5adef8..1ecf255efb40 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -170,7 +170,6 @@ void iounmap(const volatile void __iomem *addr); */ #define ioremap(offset, size) \ ioremap_prot((offset), (size), _CACHE_UNCACHED) -#define ioremap_uc ioremap /* * ioremap_cache - map bus memory into CPU space diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h index 366537042465..48630c78714a 100644 --- a/arch/parisc/include/asm/io.h +++ b/arch/parisc/include/asm/io.h @@ -132,8 +132,6 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr) #define ioremap_wc(addr, size) \ ioremap_prot((addr), (size), _PAGE_IOREMAP) -#define ioremap_uc(addr, size) \ - ioremap_prot((addr), (size), _PAGE_IOREMAP) #define pci_iounmap pci_iounmap diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index 0732b743e099..21bd3e8bffce 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -900,7 +900,6 @@ void __iomem *ioremap_wt(phys_addr_t address, unsigned long size); #endif void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size); -#define ioremap_uc(addr, size) ioremap((addr), (size)) #define ioremap_cache(addr, size) \ ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL)) diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h index f2f38e9d489a..790bea22c9b5 100644 --- a/arch/sh/include/asm/io.h +++ b/arch/sh/include/asm/io.h @@ -302,8 +302,6 @@ unsigned long long poke_real_address_q(unsigned long long addr, ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL)) #endif /* CONFIG_MMU */ -#define ioremap_uc ioremap - /* * Convert a physical pointer to a virtual kernel pointer for /dev/mem * access diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h index 9303270b22f3..d8ee1442f303 100644 --- a/arch/sparc/include/asm/io_64.h +++ b/arch/sparc/include/asm/io_64.h @@ -423,7 +423,6 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size) return (void __iomem *)offset; } -#define ioremap_uc(X,Y) ioremap((X),(Y)) #define ioremap_wc(X,Y) ioremap((X),(Y)) #define ioremap_wt(X,Y) ioremap((X),(Y)) static inline void __iomem *ioremap_np(unsigned long offset, unsigned long size)