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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 23:25:30 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-01 18:32:21 +1000 |
| commit | c7d54842deb1fa357cff75b988275a1c9f259140 (patch) | |
| tree | cab739cf4650a0397c0057a2878b386d613370a0 /drivers/misc | |
| parent | ee3caed37d763ab28f8ac55563f38fb7530c6252 (diff) | |
| download | linux-stable-c7d54842deb1fa357cff75b988275a1c9f259140.tar.gz linux-stable-c7d54842deb1fa357cff75b988275a1c9f259140.tar.bz2 linux-stable-c7d54842deb1fa357cff75b988275a1c9f259140.zip | |
powerpc/mm: Use _PAGE_READ to indicate Read access
This splits the _PAGE_RW bit into _PAGE_READ and _PAGE_WRITE. It also
removes the dependency on _PAGE_USER for implying read only. Few things
to note here is that, we have read implied with write and execute
permission. Hence we should always find _PAGE_READ set on hash pte
fault.
We still can't switch PROT_NONE to !(_PAGE_RWX). Auto numa depends on
marking a prot none pte _PAGE_WRITE. (For more details look at
b191f9b106ea "mm: numa: preserve PTE write permissions across a NUMA
hinting fault")
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/cxl/fault.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c index 9a236543da23..0feeacedcef1 100644 --- a/drivers/misc/cxl/fault.c +++ b/drivers/misc/cxl/fault.c @@ -149,9 +149,9 @@ static void cxl_handle_page_fault(struct cxl_context *ctx, * update_mmu_cache() will not have loaded the hash since current->trap * is not a 0x400 or 0x300, so just call hash_page_mm() here. */ - access = _PAGE_PRESENT; + access = _PAGE_PRESENT | _PAGE_READ; if (dsisr & CXL_PSL_DSISR_An_S) - access |= _PAGE_RW; + access |= _PAGE_WRITE; if ((!ctx->kernel) || (REGION_ID(dar) == USER_REGION_ID)) access |= _PAGE_USER; |