forked from luck/tmp_suning_uos_patched
d5531246af
commit 1c99c6a7c3c599a68321b01b9ec243215ede5a68 upstream. For situations in which we don't have a c0 counter register available, we've been falling back to reading the c0 "random" register, which is usually bounded by the amount of TLB entries and changes every other cycle or so. This means it wraps extremely often. We can do better by combining this fast-changing counter with a potentially slower-changing counter from random_get_entropy_fallback() in the more significant bits. This commit combines the two, taking into account that the changing bits are in a different bit position depending on the CPU model. In addition, we previously were falling back to 0 for ancient CPUs that Linux does not support anyway; remove that dead path entirely. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arnd Bergmann <arnd@arndb.de> Tested-by: Maciej W. Rozycki <macro@orcam.me.uk> Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
||
|---|---|---|
| .. | ||
| alchemy | ||
| ar7 | ||
| ath25 | ||
| ath79 | ||
| bcm47xx | ||
| bcm63xx | ||
| bmips | ||
| boot | ||
| cavium-octeon | ||
| cobalt | ||
| configs | ||
| crypto | ||
| dec | ||
| fw | ||
| generic | ||
| include | ||
| ingenic | ||
| jazz | ||
| kernel | ||
| kvm | ||
| lantiq | ||
| lib | ||
| loongson2ef | ||
| loongson32 | ||
| loongson64 | ||
| math-emu | ||
| mm | ||
| mti-malta | ||
| net | ||
| netlogic | ||
| oprofile | ||
| pci | ||
| pic32 | ||
| pistachio | ||
| power | ||
| ralink | ||
| rb532 | ||
| sgi-ip22 | ||
| sgi-ip27 | ||
| sgi-ip30 | ||
| sgi-ip32 | ||
| sibyte | ||
| sni | ||
| tools | ||
| txx9 | ||
| vdso | ||
| vr41xx | ||
| Kbuild | ||
| Kbuild.platforms | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile.postlink | ||