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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-15 10:03:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-15 10:03:15 -0700 |
| commit | 9ffc66941df278c9f4df979b6bcf6c6ddafedd16 (patch) | |
| tree | a2cff20aafb7ecb352a0c2dd41a5430f64a248e0 /include/linux/compiler.h | |
| parent | 133d970e0dadf7b413db19893acc5b26664bf4a1 (diff) | |
| parent | 0766f788eb727e2e330d55d30545db65bcf2623f (diff) | |
| download | lwn-9ffc66941df278c9f4df979b6bcf6c6ddafedd16.tar.gz lwn-9ffc66941df278c9f4df979b6bcf6c6ddafedd16.zip | |
Merge tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull gcc plugins update from Kees Cook:
"This adds a new gcc plugin named "latent_entropy". It is designed to
extract as much possible uncertainty from a running system at boot
time as possible, hoping to capitalize on any possible variation in
CPU operation (due to runtime data differences, hardware differences,
SMP ordering, thermal timing variation, cache behavior, etc).
At the very least, this plugin is a much more comprehensive example
for how to manipulate kernel code using the gcc plugin internals"
* tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
latent_entropy: Mark functions with __latent_entropy
gcc-plugins: Add latent_entropy plugin
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index f1bfa15b6f9b..cf0fa5d86059 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -429,6 +429,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s # define __attribute_const__ /* unimplemented */ #endif +#ifndef __latent_entropy +# define __latent_entropy +#endif + /* * Tell gcc if a function is cold. The compiler will assume any path * directly leading to the call is unlikely. |