On Wed, May 14, 2014 at 01:35:42PM +0100, Will Deacon wrote:
On Wed, May 14, 2014 at 01:32:27PM +0100, Tomasz Nowicki wrote:
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@linaro.org
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?
I don't have the background for this, but if you don't need broadcasting (if this avoids IPIs on x86, I guess you don't) then why not use local_flush_tlb_kernel_range instead?
Is this generic enough (we don't have it on arm64)?