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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-02 17:31:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-02 17:31:35 -0700
commita0b09f2d6f30723e1008bd9ddb504e302e329f81 (patch)
tree373004df20337e2f9292feb00b1751453dafa758 /arch/s390/Kconfig
parent569bede0cff5e98c0f862d486406b79dcada8eea (diff)
parent7f637be4d46029bd7700c9f244945a42dbd976fa (diff)
Merge tag 'random-6.0-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random
Pull random number generator updates from Jason Donenfeld: "Though there's been a decent amount of RNG-related development during this last cycle, not all of it is coming through this tree, as this cycle saw a shift toward tackling early boot time seeding issues, which took place in other trees as well. Here's a summary of the various patches: - The CONFIG_ARCH_RANDOM .config option and the "nordrand" boot option have been removed, as they overlapped with the more widely supported and more sensible options, CONFIG_RANDOM_TRUST_CPU and "random.trust_cpu". This change allowed simplifying a bit of arch code. - x86's RDRAND boot time test has been made a bit more robust, with RDRAND disabled if it's clearly producing bogus results. This would be a tip.git commit, technically, but I took it through random.git to avoid a large merge conflict. - The RNG has long since mixed in a timestamp very early in boot, on the premise that a computer that does the same things, but does so starting at different points in wall time, could be made to still produce a different RNG state. Unfortunately, the clock isn't set early in boot on all systems, so now we mix in that timestamp when the time is actually set. - User Mode Linux now uses the host OS's getrandom() syscall to generate a bootloader RNG seed and later on treats getrandom() as the platform's RDRAND-like faculty. - The arch_get_random_{seed_,}_long() family of functions is now arch_get_random_{seed_,}_longs(), which enables certain platforms, such as s390, to exploit considerable performance advantages from requesting multiple CPU random numbers at once, while at the same time compiling down to the same code as before on platforms like x86. - A small cleanup changing a cmpxchg() into a try_cmpxchg(), from Uros. - A comment spelling fix" More info about other random number changes that come in through various architecture trees in the full commentary in the pull request: https://lore.kernel.org/all/20220731232428.2219258-1-Jason@zx2c4.com/ * tag 'random-6.0-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random: random: correct spelling of "overwrites" random: handle archrandom with multiple longs um: seed rng using host OS rng random: use try_cmpxchg in _credit_init_bits timekeeping: contribute wall clock to rng on time change x86/rdrand: Remove "nordrand" flag in favor of "random.trust_cpu" random: remove CONFIG_ARCH_RANDOM
Diffstat (limited to 'arch/s390/Kconfig')
-rw-r--r--arch/s390/Kconfig15
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 5a1a8dfda6f8..318fce77601d 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -508,21 +508,6 @@ config KEXEC_SIG
verification for the corresponding kernel image type being
loaded in order for this to work.
-config ARCH_RANDOM
- def_bool y
- prompt "s390 architectural random number generation API"
- help
- Enable the s390 architectural random number generation API
- to provide random data for all consumers within the Linux
- kernel.
-
- When enabled the arch_random_* functions declared in linux/random.h
- are implemented. The implementation is based on the s390 CPACF
- instruction subfunction TRNG which provides a real true random
- number generator.
-
- If unsure, say Y.
-
config KERNEL_NOBP
def_bool n
prompt "Enable modified branch prediction for the kernel by default"