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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-19 21:12:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-19 21:12:00 -0800 |
| commit | 4657190936883adb819f81957e33439d447c0035 (patch) | |
| tree | 70342debfb779a8b10d2a8440c1ae99593806079 /include/asm-mips/io.h | |
| parent | 4a29cc2e503b33a1e96db4c3f9a94165f153f259 (diff) | |
| parent | 9007c9a2b03ea325ee593a161dbf01dbb8222d7e (diff) | |
| download | kernel-crypto-4657190936883adb819f81957e33439d447c0035.tar.gz kernel-crypto-4657190936883adb819f81957e33439d447c0035.tar.xz kernel-crypto-4657190936883adb819f81957e33439d447c0035.zip | |
Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
[MIPS] SB1: Check for -mno-sched-prolog if building corelis debug kernel.
[MIPS] Sibyte: Fix race in sb1250_gettimeoffset().
[MIPS] Sibyte: Fix interrupt timer off by one bug.
[MIPS] Sibyte: Fix M_SCD_TIMER_INIT and M_SCD_TIMER_CNT wrong field width.
[MIPS] Protect more of timer_interrupt() by xtime_lock.
[MIPS] Work around bad code generation for <asm/io.h>.
[MIPS] Simple patch to power off DBAU1200
[MIPS] Fix DBAu1550 software power off.
[MIPS] local_r4k_flush_cache_page fix
[MIPS] SB1: Fix interrupt disable hazard.
[MIPS] Get rid of the IP22-specific code in arclib.
Update MAINTAINERS entry for MIPS.
Diffstat (limited to 'include/asm-mips/io.h')
| -rw-r--r-- | include/asm-mips/io.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h index 8c011aa61af..ba1d7bbc15d 100644 --- a/include/asm-mips/io.h +++ b/include/asm-mips/io.h @@ -4,7 +4,7 @@ * for more details. * * Copyright (C) 1994, 1995 Waldorf GmbH - * Copyright (C) 1994 - 2000 Ralf Baechle + * Copyright (C) 1994 - 2000, 06 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. * Author: Maciej W. Rozycki <macro@mips.com> @@ -103,8 +103,20 @@ */ extern const unsigned long mips_io_port_base; -#define set_io_port_base(base) \ - do { * (unsigned long *) &mips_io_port_base = (base); } while (0) +/* + * Gcc will generate code to load the value of mips_io_port_base after each + * function call which may be fairly wasteful in some cases. So we don't + * play quite by the book. We tell gcc mips_io_port_base is a long variable + * which solves the code generation issue. Now we need to violate the + * aliasing rules a little to make initialization possible and finally we + * will need the barrier() to fight side effects of the aliasing chat. + * This trickery will eventually collapse under gcc's optimizer. Oh well. + */ +static inline void set_io_port_base(unsigned long base) +{ + * (unsigned long *) &mips_io_port_base = base; + barrier(); +} /* * Thanks to James van Artsdalen for a better timing-fix than |