From: H. Peter Anvin Date: Wed, 6 Apr 2011 20:10:02 +0000 (-0700) Subject: x86, hibernate: Initialize mmu_cr4_features during boot X-Git-Tag: v3.12-rc1~6406^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4da9484bdece39ab0b098fa711e095e3e9fc8684;p=kernel%2Fkernel-generic.git x86, hibernate: Initialize mmu_cr4_features during boot Restore the initialization of mmu_cr4_features during boot, which was removed without comment in checkin e5f15b45ddf3afa2bbbb10c7ea34fb32b6de0a0e x86: Cleanup highmap after brk is concluded thereby breaking resume from hibernate. This restores previous functionality in approximately the same place, and corrects the reading of %cr4 on pre-CPUID hardware (%cr4 exists if and only if CPUID is supported.) However, part of the problem is that the hibernate suspend/resume sequence should manage the save/restore of %cr4 explicitly. Signed-off-by: H. Peter Anvin Cc: Rafael J. Wysocki Cc: Stefano Stabellini Cc: Yinghai Lu LKML-Reference: <201104020154.57136.rjw@sisk.pl> --- diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 5a0484a..4be9b39 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -976,6 +976,11 @@ void __init setup_arch(char **cmdline_p) paging_init(); x86_init.paging.pagetable_setup_done(swapper_pg_dir); + if (boot_cpu_data.cpuid_level >= 0) { + /* A CPU has %cr4 if and only if it has CPUID */ + mmu_cr4_features = read_cr4(); + } + #ifdef CONFIG_X86_32 /* sync back kernel address range */ clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,