Re: [PATCH] add readX_relaxed() interface
From: Jesse Barnes
Date: Tue Jan 20 2004 - 13:38:46 EST
Sorry, that last mail didn't make for a very good changeset comment.
Here's another.
Add readX_relaxed() interface. Allows drivers to specify that a
particular PIO read doesn't need to be held up behind previous DMA
writes, which can save CPU time and improve performance.
Jesse
diff -Nru a/Documentation/DocBook/deviceiobook.tmpl b/Documentation/DocBook/deviceiobook.tmpl
--- a/Documentation/DocBook/deviceiobook.tmpl Tue Jan 20 09:50:27 2004
+++ b/Documentation/DocBook/deviceiobook.tmpl Tue Jan 20 09:50:27 2004
@@ -126,7 +126,9 @@
<para>
The functions are named <function>readb</function>,
<function>readw</function>, <function>readl</function>,
- <function>readq</function>, <function>writeb</function>,
+ <function>readq</function>, <function>readb_relaxed</function>,
+ <function>readw_relaxed</function>, <function>readl_relaxed</function>,
+ <function>readq_relaxed</function>, <function>writeb</function>,
<function>writew</function>, <function>writel</function> and
<function>writeq</function>.
</para>
@@ -158,6 +160,18 @@
device to ensure that writes have occurred in the specific cases the
author cares. This kind of property cannot be hidden from driver
writers in the API.
+ </para>
+
+ <para>
+ PCI ordering rules also guarantee that PIO read responses arrive
+ after any outstanding DMA writes on that bus, since for some devices
+ the result of a <function>readb</function> call may signal to the
+ driver that a DMA transaction is complete. In many cases, however,
+ the driver may want to indicate that the next
+ <function>readb</function> call has no relation to any previous DMA
+ writes performed by the device. The driver can use
+ <function>readb_relaxed</function> for these cases, although only
+ some platforms will honor the relaxed semantics.
</para>
</sect1>
diff -Nru a/arch/ia64/sn/kernel/sn2/io.c b/arch/ia64/sn/kernel/sn2/io.c
--- a/arch/ia64/sn/kernel/sn2/io.c Tue Jan 20 09:50:27 2004
+++ b/arch/ia64/sn/kernel/sn2/io.c Tue Jan 20 09:50:27 2004
@@ -23,6 +23,10 @@
#undef __sn_readw
#undef __sn_readl
#undef __sn_readq
+#undef __sn_readb_relaxed
+#undef __sn_readw_relaxed
+#undef __sn_readl_relaxed
+#undef __sn_readq_relaxed
unsigned int
__sn_inb (unsigned long port)
@@ -82,6 +86,30 @@
__sn_readq (void *addr)
{
return ___sn_readq (addr);
+}
+
+unsigned char
+__sn_readb_relaxed (void *addr)
+{
+ return ___sn_readb_relaxed (addr);
+}
+
+unsigned short
+__sn_readw_relaxed (void *addr)
+{
+ return ___sn_readw_relaxed (addr);
+}
+
+unsigned int
+__sn_readl_relaxed (void *addr)
+{
+ return ___sn_readl_relaxed (addr);
+}
+
+unsigned long
+__sn_readq_relaxed (void *addr)
+{
+ return ___sn_readq_relaxed (addr);
}
#endif
diff -Nru a/include/asm-alpha/io.h b/include/asm-alpha/io.h
--- a/include/asm-alpha/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-alpha/io.h Tue Jan 20 09:50:27 2004
@@ -412,6 +412,11 @@
# define readq(a) _readq((unsigned long)(a))
#endif
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+#define readq_relaxed(addr) readq(addr)
+
#ifndef writeb
# define writeb(v,a) _writeb((v),(unsigned long)(a))
#endif
diff -Nru a/include/asm-arm/arch-ebsa110/io.h b/include/asm-arm/arch-ebsa110/io.h
--- a/include/asm-arm/arch-ebsa110/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-arm/arch-ebsa110/io.h Tue Jan 20 09:50:27 2004
@@ -38,6 +38,9 @@
#define readb(b) __readb(b)
#define readw(b) __readw(b)
#define readl(b) __readl(b)
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
void __writeb(u8 val, void *addr);
void __writew(u16 val, void *addr);
diff -Nru a/include/asm-arm/io.h b/include/asm-arm/io.h
--- a/include/asm-arm/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-arm/io.h Tue Jan 20 09:50:27 2004
@@ -149,6 +149,9 @@
#define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
#define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
#define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
#define readsb(p,d,l) __raw_readsb((unsigned int)__mem_pci(p),d,l)
#define readsw(p,d,l) __raw_readsw((unsigned int)__mem_pci(p),d,l)
diff -Nru a/include/asm-arm26/io.h b/include/asm-arm26/io.h
--- a/include/asm-arm26/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-arm26/io.h Tue Jan 20 09:50:27 2004
@@ -308,6 +308,9 @@
#define readb(c) (__readwrite_bug("readb"),0)
#define readw(c) (__readwrite_bug("readw"),0)
#define readl(c) (__readwrite_bug("readl"),0)
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
#define writeb(v,c) __readwrite_bug("writeb")
#define writew(v,c) __readwrite_bug("writew")
#define writel(v,c) __readwrite_bug("writel")
diff -Nru a/include/asm-cris/io.h b/include/asm-cris/io.h
--- a/include/asm-cris/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-cris/io.h Tue Jan 20 09:50:27 2004
@@ -42,6 +42,9 @@
#define readb(addr) (*(volatile unsigned char *) (addr))
#define readw(addr) (*(volatile unsigned short *) (addr))
#define readl(addr) (*(volatile unsigned int *) (addr))
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
diff -Nru a/include/asm-h8300/io.h b/include/asm-h8300/io.h
--- a/include/asm-h8300/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-h8300/io.h Tue Jan 20 09:50:27 2004
@@ -47,6 +47,10 @@
#define readl(addr) \
({ unsigned int __v = (*(volatile unsigned int *) (addr & 0x00ffffff)); __v; })
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+
#define writeb(b,addr) (void)((*(volatile unsigned char *) (addr & 0x00ffffff)) = (b))
#define writew(b,addr) (void)((*(volatile unsigned short *) (addr & 0x00ffffff)) = (b))
#define writel(b,addr) (void)((*(volatile unsigned int *) (addr & 0x00ffffff)) = (b))
diff -Nru a/include/asm-i386/io.h b/include/asm-i386/io.h
--- a/include/asm-i386/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-i386/io.h Tue Jan 20 09:50:27 2004
@@ -153,6 +153,9 @@
#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
diff -Nru a/include/asm-ia64/io.h b/include/asm-ia64/io.h
--- a/include/asm-ia64/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-ia64/io.h Tue Jan 20 09:50:27 2004
@@ -125,6 +125,10 @@
#define __ia64_readw ___ia64_readw
#define __ia64_readl ___ia64_readl
#define __ia64_readq ___ia64_readq
+#define __ia64_readb_relaxed ___ia64_readb
+#define __ia64_readw_relaxed ___ia64_readw
+#define __ia64_readl_relaxed ___ia64_readl
+#define __ia64_readq_relaxed ___ia64_readq
#define __ia64_writeb ___ia64_writeb
#define __ia64_writew ___ia64_writew
#define __ia64_writel ___ia64_writel
@@ -337,15 +341,27 @@
#define __readw platform_readw
#define __readl platform_readl
#define __readq platform_readq
+#define __readb_relaxed platform_readb_relaxed
+#define __readw_relaxed platform_readw_relaxed
+#define __readl_relaxed platform_readl_relaxed
+#define __readq_relaxed platform_readq_relaxed
#define readb(a) __readb((void *)(a))
#define readw(a) __readw((void *)(a))
#define readl(a) __readl((void *)(a))
#define readq(a) __readq((void *)(a))
+#define readb_relaxed(a) __readb_relaxed((void *)(a))
+#define readw_relaxed(a) __readw_relaxed((void *)(a))
+#define readl_relaxed(a) __readl_relaxed((void *)(a))
+#define readq_relaxed(a) __readq_relaxed((void *)(a))
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define __raw_readq readq
+#define __raw_readb_relaxed readb_relaxed
+#define __raw_readw_relaxed readw_relaxed
+#define __raw_readl_relaxed readl_relaxed
+#define __raw_readq_relaxed readq_relaxed
#define writeb(v,a) __writeb((v), (void *) (a))
#define writew(v,a) __writew((v), (void *) (a))
#define writel(v,a) __writel((v), (void *) (a))
diff -Nru a/include/asm-ia64/machvec.h b/include/asm-ia64/machvec.h
--- a/include/asm-ia64/machvec.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-ia64/machvec.h Tue Jan 20 09:50:27 2004
@@ -64,6 +64,10 @@
typedef unsigned short ia64_mv_readw_t (void *);
typedef unsigned int ia64_mv_readl_t (void *);
typedef unsigned long ia64_mv_readq_t (void *);
+typedef unsigned char ia64_mv_readb_relaxed_t (void *);
+typedef unsigned short ia64_mv_readw_relaxed_t (void *);
+typedef unsigned int ia64_mv_readl_relaxed_t (void *);
+typedef unsigned long ia64_mv_readq_relaxed_t (void *);
extern void machvec_noop (void);
extern void machvec_memory_fence (void);
@@ -114,6 +118,10 @@
# define platform_readw ia64_mv.readw
# define platform_readl ia64_mv.readl
# define platform_readq ia64_mv.readq
+# define platform_readb_relaxed ia64_mv.readb_relaxed
+# define platform_readw_relaxed ia64_mv.readw_relaxed
+# define platform_readl_relaxed ia64_mv.readl_relaxed
+# define platform_readq_relaxed ia64_mv.readq_relaxed
# endif
/* __attribute__((__aligned__(16))) is required to make size of the
@@ -155,6 +163,10 @@
ia64_mv_readw_t *readw;
ia64_mv_readl_t *readl;
ia64_mv_readq_t *readq;
+ ia64_mv_readb_relaxed_t *readb_relaxed;
+ ia64_mv_readw_relaxed_t *readw_relaxed;
+ ia64_mv_readl_relaxed_t *readl_relaxed;
+ ia64_mv_readq_relaxed_t *readq_relaxed;
} __attribute__((__aligned__(16))); /* align attrib? see above comment */
#define MACHVEC_INIT(name) \
@@ -192,6 +204,10 @@
platform_readw, \
platform_readl, \
platform_readq, \
+ platform_readb_relaxed, \
+ platform_readw_relaxed, \
+ platform_readl_relaxed, \
+ platform_readq_relaxed, \
}
extern struct ia64_machine_vector ia64_mv;
@@ -314,6 +330,18 @@
#endif
#ifndef platform_readq
# define platform_readq __ia64_readq
+#endif
+#ifndef platform_readb_relaxed
+# define platform_readb_relaxed __ia64_readb_relaxed
+#endif
+#ifndef platform_readw_relaxed
+# define platform_readw_relaxed __ia64_readw_relaxed
+#endif
+#ifndef platform_readl_relaxed
+# define platform_readl_relaxed __ia64_readl_relaxed
+#endif
+#ifndef platform_readq_relaxed
+# define platform_readq_relaxed __ia64_readq_relaxed
#endif
#endif /* _ASM_IA64_MACHVEC_H */
diff -Nru a/include/asm-ia64/machvec_sn2.h b/include/asm-ia64/machvec_sn2.h
--- a/include/asm-ia64/machvec_sn2.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-ia64/machvec_sn2.h Tue Jan 20 09:50:27 2004
@@ -51,6 +51,10 @@
extern ia64_mv_readw_t __sn_readw;
extern ia64_mv_readl_t __sn_readl;
extern ia64_mv_readq_t __sn_readq;
+extern ia64_mv_readb_t __sn_readb_relaxed;
+extern ia64_mv_readw_t __sn_readw_relaxed;
+extern ia64_mv_readl_t __sn_readl_relaxed;
+extern ia64_mv_readq_t __sn_readq_relaxed;
extern ia64_mv_dma_alloc_coherent sn_dma_alloc_coherent;
extern ia64_mv_dma_free_coherent sn_dma_free_coherent;
extern ia64_mv_dma_map_single sn_dma_map_single;
@@ -85,6 +89,10 @@
#define platform_readw __sn_readw
#define platform_readl __sn_readl
#define platform_readq __sn_readq
+#define platform_readb_relaxed __sn_readb_relaxed
+#define platform_readw_relaxed __sn_readw_relaxed
+#define platform_readl_relaxed __sn_readl_relaxed
+#define platform_readq_relaxed __sn_readq_relaxed
#define platform_irq_desc sn_irq_desc
#define platform_irq_to_vector sn_irq_to_vector
#define platform_local_vector_to_irq sn_local_vector_to_irq
diff -Nru a/include/asm-ia64/sn/sn2/io.h b/include/asm-ia64/sn/sn2/io.h
--- a/include/asm-ia64/sn/sn2/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-ia64/sn/sn2/io.h Tue Jan 20 09:50:27 2004
@@ -27,6 +27,10 @@
#define __sn_readw ___sn_readw
#define __sn_readl ___sn_readl
#define __sn_readq ___sn_readq
+#define __sn_readb_relaxed ___sn_readb_relaxed
+#define __sn_readw_relaxed ___sn_readw_relaxed
+#define __sn_readl_relaxed ___sn_readl_relaxed
+#define __sn_readq_relaxed ___sn_readq_relaxed
/*
* The following routines are SN Platform specific, called when
@@ -208,25 +212,25 @@
}
static inline unsigned char
-sn_readb_fast (void *addr)
+___sn_readb_relaxed (void *addr)
{
return *(volatile unsigned char *)addr;
}
static inline unsigned short
-sn_readw_fast (void *addr)
+___sn_readw_relaxed (void *addr)
{
return *(volatile unsigned short *)addr;
}
static inline unsigned int
-sn_readl_fast (void *addr)
+___sn_readl_relaxed (void *addr)
{
return *(volatile unsigned int *) addr;
}
static inline unsigned long
-sn_readq_fast (void *addr)
+___sn_readq_relaxed (void *addr)
{
return *(volatile unsigned long *) addr;
}
diff -Nru a/include/asm-m68k/io.h b/include/asm-m68k/io.h
--- a/include/asm-m68k/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-m68k/io.h Tue Jan 20 09:50:27 2004
@@ -261,6 +261,10 @@
#define writeb(val,addr) out_8((addr),(val))
#define writew(val,addr) out_le16((addr),(val))
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+
#ifndef CONFIG_ISA
#define inb(port) in_8(port)
#define outb(val,port) out_8((port),(val))
diff -Nru a/include/asm-m68knommu/io.h b/include/asm-m68knommu/io.h
--- a/include/asm-m68knommu/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-m68knommu/io.h Tue Jan 20 09:50:27 2004
@@ -39,6 +39,10 @@
#define readl(addr) \
({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+
#define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
#define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
#define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
diff -Nru a/include/asm-mips/io.h b/include/asm-mips/io.h
--- a/include/asm-mips/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-mips/io.h Tue Jan 20 09:50:27 2004
@@ -264,6 +264,10 @@
#define readw(addr) __ioswab16(__raw_readw(addr))
#define readl(addr) __ioswab32(__raw_readl(addr))
#define readq(addr) __ioswab64(__raw_readq(addr))
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+#define readq_relaxed(addr) readq(addr)
#define __raw_writeb(b,addr) ((*(volatile unsigned char *)(addr)) = (b))
#define __raw_writew(w,addr) ((*(volatile unsigned short *)(addr)) = (w))
diff -Nru a/include/asm-parisc/io.h b/include/asm-parisc/io.h
--- a/include/asm-parisc/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-parisc/io.h Tue Jan 20 09:50:27 2004
@@ -171,6 +171,11 @@
#define writeq(b,addr) __raw_writeq(cpu_to_le64(b),addr)
#endif /* !USE_HPPA_IOREMAP */
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+#define readq_relaxed(addr) readq(addr)
+
extern void __memcpy_fromio(unsigned long dest, unsigned long src, int count);
extern void __memcpy_toio(unsigned long dest, unsigned long src, int count);
extern void __memset_io(unsigned long dest, char fill, int count);
diff -Nru a/include/asm-ppc/io.h b/include/asm-ppc/io.h
--- a/include/asm-ppc/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-ppc/io.h Tue Jan 20 09:50:27 2004
@@ -58,6 +58,9 @@
#define writel(b,addr) out_le32((volatile u32 *)(addr),(b))
#endif /* CONFIG_APUS */
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
#define __raw_readb(addr) (*(volatile unsigned char *)(addr))
#define __raw_readw(addr) (*(volatile unsigned short *)(addr))
diff -Nru a/include/asm-ppc64/io.h b/include/asm-ppc64/io.h
--- a/include/asm-ppc64/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-ppc64/io.h Tue Jan 20 09:50:27 2004
@@ -79,6 +79,10 @@
#define outsl(port, buf, nl) _outsl_ns((u32 *)((port)+pci_io_base), (buf), (nl))
#endif
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+
extern void _insb(volatile u8 *port, void *buf, int ns);
extern void _outsb(volatile u8 *port, const void *buf, int ns);
extern void _insw(volatile u16 *port, void *buf, int ns);
diff -Nru a/include/asm-s390/io.h b/include/asm-s390/io.h
--- a/include/asm-s390/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-s390/io.h Tue Jan 20 09:50:27 2004
@@ -87,6 +87,10 @@
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+
#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
diff -Nru a/include/asm-sh/io.h b/include/asm-sh/io.h
--- a/include/asm-sh/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-sh/io.h Tue Jan 20 09:50:27 2004
@@ -264,6 +264,10 @@
# define readl(a) _readl((unsigned long)(a))
#endif
+#define readb_relaxed(a) readb(a)
+#define readw_relaxed(a) readw(a)
+#define readl_relaxed(a) readl(a)
+
#ifndef writeb
# define writeb(v,a) _writeb((v),(unsigned long)(a))
#endif
diff -Nru a/include/asm-sparc/io.h b/include/asm-sparc/io.h
--- a/include/asm-sparc/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-sparc/io.h Tue Jan 20 09:50:27 2004
@@ -99,6 +99,9 @@
#define readb(addr) __readb((unsigned long)(addr))
#define readw(addr) __readw((unsigned long)(addr))
#define readl(addr) __readl((unsigned long)(addr))
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
#define writeb(b, addr) __writeb((b),(unsigned long)(addr))
#define writew(b, addr) __writew((b),(unsigned long)(addr))
diff -Nru a/include/asm-sparc64/io.h b/include/asm-sparc64/io.h
--- a/include/asm-sparc64/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-sparc64/io.h Tue Jan 20 09:50:27 2004
@@ -176,6 +176,10 @@
#define readw(__addr) (_readw((unsigned long)(__addr)))
#define readl(__addr) (_readl((unsigned long)(__addr)))
#define readq(__addr) (_readq((unsigned long)(__addr)))
+#define readb_relaxed(a) readb(a)
+#define readw_relaxed(a) readw(a)
+#define readl_relaxed(a) readl(a)
+#define readq_relaxed(a) readq(a)
#define writeb(__b, __addr) (_writeb((u8)(__b), (unsigned long)(__addr)))
#define writew(__w, __addr) (_writew((u16)(__w), (unsigned long)(__addr)))
#define writel(__l, __addr) (_writel((u32)(__l), (unsigned long)(__addr)))
diff -Nru a/include/asm-v850/io.h b/include/asm-v850/io.h
--- a/include/asm-v850/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-v850/io.h Tue Jan 20 09:50:27 2004
@@ -23,6 +23,10 @@
#define readl(addr) \
({ unsigned long __v = (*(volatile unsigned long *) (addr)); __v; })
+#define readb_relaxed(a) readb(a)
+#define readw_relaxed(a) readw(a)
+#define readl_relaxed(a) readl(a)
+
#define writeb(b, addr) \
(void)((*(volatile unsigned char *) (addr)) = (b))
#define writew(b, addr) \
diff -Nru a/include/asm-x86_64/io.h b/include/asm-x86_64/io.h
--- a/include/asm-x86_64/io.h Tue Jan 20 09:50:27 2004
+++ b/include/asm-x86_64/io.h Tue Jan 20 09:50:27 2004
@@ -188,6 +188,10 @@
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
#define readq(addr) (*(volatile unsigned long *) __io_virt(addr))
+#define readb_relaxed(a) readb(a)
+#define readw_relaxed(a) readw(a)
+#define readl_relaxed(a) readl(a)
+#define readq_relaxed(a) readq(a)
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
-
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