Re: [PATCH 6/7] acpi, apei, ghes: Make unmapping functionality independent from architecture.

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On 13.05.2014 22:11, Borislav Petkov wrote:
On Wed, Apr 09, 2014 at 05:14:34PM +0200, Tomasz Nowicki wrote:
Till now __flush_tlb_one was used for unmapping virtual memory which
is x86 specific function. Replace it with more generic
flush_tlb_kernel_range.

Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
---
  drivers/acpi/apei/ghes.c |    4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index aaf8db3..624878b 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -185,7 +185,7 @@ static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)

  	BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
  	unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
-	__flush_tlb_one(vaddr);
+	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
  }

  static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
@@ -195,7 +195,7 @@ static void ghes_iounmap_irq(void __iomem *vaddr_ptr)

  	BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
  	unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
-	__flush_tlb_one(vaddr);
+	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);

flush_tlb_kernel_range() does send an IPI to every core on x86 which is
much more expensive than what __flush_tlb_one does.

Fairer it would be if you added a __flush_tlb_one() version for arm
which does flush_tlb_kernel_range for you.


Thanks for comment. I am not sure if maintainers will allow me to add sth like __flush_tlb_one() for arm/arm64. Let me ask them directly. Catalin, Russell what do you think?

Regards,
Tomasz
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