On 03/09/2017 07:15 PM, Linus Torvalds wrote:
On Thu, Mar 9, 2017 at 10:10 AM, Linus Torvalds
<torva...@linux-foundation.org> wrote:
Very odd. We should always have PGE (0x0080) set in cr4 (if the CPU
supports it).
Daniel, do you see the code in probe_page_size_mask() triggering?
/* Enable PGE if available */
if (boot_cpu_has(X86_FEATURE_PGE)) {
cr4_set_bits_and_update_boot(X86_CR4_PGE);
__supported_pte_mask |= _PAGE_GLOBAL;
We do have boot_cpu_has(X86_FEATURE_PGE) and go indeed into this
branch here. So it seems something must be clearing it later, hmm.
} else
__supported_pte_mask &= ~_PAGE_GLOBAL;
but maybe there's something wrong with the percpu cr4 caching?
Linus
