Re: [patch 28/38] mips: Select ARCH_HAS_RANDOM_ENTROPY
"Maciej W. Rozycki" <[email protected]> Mon, 13 Apr 2026 06:47:45 +0100 (BST)
| Newsgroups | org.kernel.vger.linux-hams,dev.linux.lists.iommu,dev.linux.lists.loongarch,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-riscv,org.kernel.vger.linux-alpha,org.kernel.vger.linux-crypto,org.kernel.vger.linux-ext4,org.kernel.vger.linux-fbdev,org.kernel.vger.linux-kernel,org.kernel.vger.linux-m68k,org.kernel.vger.linux-openrisc,org.kernel.vger.linux-parisc,org.kernel.vger.linux-s390,org.kernel.vger.linux-wireless,org.kernel.vger.netdev,org.kernel.vger.sparclinux,org.kvack.linux-mm,org.ozlabs.lists.linuxppc-dev |
|---|---|
| Message-ID | <[email protected]> |
On Fri, 10 Apr 2026, Thomas Gleixner wrote:
> The only solution for now is to uninline random_get_entropy(). Fix up all
> other dependencies on the content of asm/timex.h in those files which
> really depend on it.
Oh dear! I'd yet have to fully evaluate the consequences, but offhand
this has clearly turned what compiles to a single CPU instruction on the
vast majority of MIPS platforms into an expensive function call, possibly
also changing the caller from a leaf to a nested function with all the
associated execution penalty. Is there no other way?
Cf. commit 06947aaaf9bf ("MIPS: Implement random_get_entropy with CP0
Random").
Maciej