A new Linux patch addresses an issue where Translation Lookaside Buffer (TLB) sizes on AMD Zen 5 processors were being under-reported. AMD began reporting these sizes as multiples of 32 with the Zen 5 series, but the Linux kernel lacked the necessary code to interpret this new reporting method.
The patch corrects this, ensuring that TLB sizes for AMD EPYC and Ryzen Zen 5 CPUs are accurately displayed in tools like /proc/cpuinfo. This fix also extends to future AMD CPUs, including Zen 6, that utilize this reporting method. The kernel was not adapted to check the necessary bit and make the appropriate calculation.
The patch is currently in the x86/cpu branch and is expected to be included in the Linux 7.4 merge window, rather than being expedited as a fix for Linux 7.3.
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