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<linux/hash.h>: Add support for architecture-specific functions

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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 <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: Andreas Schwab <[email protected]>
Cc: Philippe De Muyter <[email protected]>
Cc: [email protected]
Cc: Alistair Francis <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: [email protected]
This commit is contained in:
George Spelvin 2016-05-26 22:11:51 -04:00
commit 468a942852
6 changed files with 299 additions and 4 deletions
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8
arch/Kconfig
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@ -589,6 +589,14 @@ config HAVE_STACK_VALIDATION
Architecture supports the 'objtool check' host tool command, which
performs compile-time stack metadata validation.
config HAVE_ARCH_HASH
bool
default n
help
If this is set, the architecture provides an <asm/hash.h>
file which provides platform-specific implementations of some
functions in <linux/hash.h> or fs/namei.c.
#
# ABI hall of shame
#