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powerpc/mm: Rename find_linux_pte_or_hugepte()

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Add newer helpers to make the function usage simpler. It is always
recommended to use find_current_mm_pte() for walking the page table.
If we cannot use find_current_mm_pte(), it should be documented why
the said usage of __find_linux_pte() is safe against a parallel THP
split.

For now we have KVM code using __find_linux_pte(). This is because kvm
code ends up calling __find_linux_pte() in real mode with MSR_EE=0 but
with PACA soft_enabled = 1. We may want to fix that later and make
sure we keep the MSR_EE and PACA soft_enabled in sync. When we do that
we can switch kvm to use find_linux_pte().

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2017-07-27 11:54:53 +05:30
committed by Michael Ellerman
parent 520eccdfe1
commit 94171b19c3
13 changed files with 103 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/eeh.c
View File

@@ -44,6 +44,7 @@
#include <asm/machdep.h>
#include <asm/ppc-pci.h>
#include <asm/rtas.h>
#include <asm/pte-walk.h>
/** Overview:
@@ -352,8 +353,7 @@ static inline unsigned long eeh_token_to_phys(unsigned long token)
* worried about _PAGE_SPLITTING/collapse. Also we will not hit
* page table free, because of init_mm.
*/
ptep = __find_linux_pte_or_hugepte(init_mm.pgd, token,
NULL, &hugepage_shift);
ptep = find_init_mm_pte(token, &hugepage_shift);
if (!ptep)
return token;
WARN_ON(hugepage_shift);

5
arch/powerpc/kernel/io-workarounds.c
View File

@@ -19,6 +19,8 @@
#include <asm/pgtable.h>
#include <asm/ppc-pci.h>
#include <asm/io-workarounds.h>
#include <asm/pte-walk.h>
#define IOWA_MAX_BUS 8
@@ -75,8 +77,7 @@ struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
* We won't find huge pages here (iomem). Also can't hit
* a page table free due to init_mm
*/
ptep = __find_linux_pte_or_hugepte(init_mm.pgd, vaddr,
NULL, &hugepage_shift);
ptep = find_init_mm_pte(vaddr, &hugepage_shift);
if (ptep == NULL)
paddr = 0;
else {