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| author | George Spelvin <linux@sciencehorizons.net> | 2016-05-27 04:11:51 +0200 |
|---|---|---|
| committer | George Spelvin <linux@sciencehorizons.net> | 2016-05-28 21:48:31 +0200 |
| commit | 468a9428521e7d00fb21250af363eb94dc1d6861 (patch) | |
| tree | 75a5e7b73594e643a1f8ca870bcc4fe679bfb610 /fs | |
| parent | fs/namei.c: Improve dcache hash function (diff) | |
| download | linux-468a9428521e7d00fb21250af363eb94dc1d6861.tar.xz linux-468a9428521e7d00fb21250af363eb94dc1d6861.zip | |
<linux/hash.h>: Add support for architecture-specific functions
This is just the infrastructure; there are no users yet.
This is modelled on CONFIG_ARCH_RANDOM; a CONFIG_ symbol declares
the existence of <asm/hash.h>.
That file may define its own versions of various functions, and define
HAVE_* symbols (no CONFIG_ prefix!) to suppress the generic ones.
Included is a self-test (in lib/test_hash.c) that verifies the basics.
It is NOT in general required that the arch-specific functions compute
the same thing as the generic, but if a HAVE_* symbol is defined with
the value 1, then equality is tested.
Signed-off-by: George Spelvin <linux@sciencehorizons.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Cc: Philippe De Muyter <phdm@macq.eu>
Cc: linux-m68k@lists.linux-m68k.org
Cc: Alistair Francis <alistai@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: uclinux-h8-devel@lists.sourceforge.jp
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/namei.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/namei.c b/fs/namei.c index a49cbd7efcaa..968dae025230 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1788,7 +1788,11 @@ static int walk_component(struct nameidata *nd, int flags) #include <asm/word-at-a-time.h> -#ifdef CONFIG_64BIT +#ifdef HASH_MIX + +/* Architecture provides HASH_MIX and fold_hash() in <asm/hash.h> */ + +#elif defined(CONFIG_64BIT) /* * Register pressure in the mixing function is an issue, particularly * on 32-bit x86, but almost any function requires one state value and |