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@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? > > 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)? -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
