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Date: Wed, 24 Sep 2014 21:26:03 +0100 From: Bryan O'Donoghue <pure.logic@...us-software.ie> To: hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, x86@...nel.org Cc: linux-kernel@...r.kernel.org, pure.logic@...us-software.ie Subject: [PATCH] x86: Quark: Add comment on TLB flush to setup_arch Quark X1000 requires CR3 to be rewritten to flush TLB entries irrespective of the PGE bits in CR4 or PTE.PGE Add a comment to setup_arch to indicate that the code load_cr3(swapper_pg_dir); __flush_tlb_all(); Will already have flushed the TLB @ the CR3 reload allowing us to skip over a potential if/else for Quark Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie> --- arch/x86/kernel/setup.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 41ead8d..e7d7f6e 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -878,6 +878,11 @@ void __init setup_arch(char **cmdline_p) initial_page_table + KERNEL_PGD_BOUNDARY, KERNEL_PGD_PTRS); + /* + * Locate the page directory and flush the TLB. + * On Quark X1000 rewriting CR3 flushes the TLB no if/else is required + * to choose between __flush_tlb() and __flush_tlb_all() + */ load_cr3(swapper_pg_dir); __flush_tlb_all(); #else -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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