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x86/tlb: Move cr4_set_bits_and_update_boot() to the usage site 

No point in having this exposed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200421092559.940978251@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-04-21 11:20:39 +02:00 committed by Borislav Petkov
parent 69de6c1a7f
commit 96f59fe291
2 changed files with 13 additions and 14 deletions
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14
arch/x86/include/asm/tlbflush.h
View File

@ -322,23 +322,9 @@ static inline void cr4_clear_bits(unsigned long mask)
local_irq_restore(flags);
}
/*
* Save some of cr4 feature set we're using (e.g. Pentium 4MB
* enable and PPro Global page enable), so that any CPU's that boot
* up after us can get the correct flags. This should only be used
* during boot on the boot cpu.
*/
extern unsigned long mmu_cr4_features;
extern u32 *trampoline_cr4_features;
static inline void cr4_set_bits_and_update_boot(unsigned long mask)
{
mmu_cr4_features |= mask;
if (trampoline_cr4_features)
*trampoline_cr4_features = mmu_cr4_features;
cr4_set_bits(mask);
}
extern void initialize_tlbstate_and_flush(void);
#define TLB_FLUSH_ALL -1UL

13
arch/x86/mm/init.c
View File

@ -194,6 +194,19 @@ struct map_range {
static int page_size_mask;
/*
* Save some of cr4 feature set we're using (e.g. Pentium 4MB
* enable and PPro Global page enable), so that any CPU's that boot
* up after us can get the correct flags. Invoked on the boot CPU.
*/
static inline void cr4_set_bits_and_update_boot(unsigned long mask)
{
mmu_cr4_features |= mask;
if (trampoline_cr4_features)
*trampoline_cr4_features = mmu_cr4_features;
cr4_set_bits(mask);
}
static void __init probe_page_size_mask(void)
{
/*