xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Koodi Ongelmat Pull-pyynnöt Actions Paketit Projektit Julkaisut Wiki Toiminta

powerpc/mm: Use _PAGE_READ to indicate Read access

Selaa lähdekoodia 
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
b191f9b106 "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>
This commit is contained in:
Aneesh Kumar K.V
2016-04-29 23:25:30 +10:00
committed by Michael Ellerman
vanhempi ee3caed37d
commit c7d54842de
14 muutettua tiedostoa jossa 49 lisäystä ja 37 poistoa
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/platforms/cell/spu_base.c
Näytä tiedosto

@@ -197,7 +197,7 @@ static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
(REGION_ID(ea) != USER_REGION_ID)) {
spin_unlock(&spu->register_lock);
ret = hash_page(ea, _PAGE_PRESENT, 0x300, dsisr);
ret = hash_page(ea, _PAGE_PRESENT | _PAGE_READ, 0x300, dsisr);
spin_lock(&spu->register_lock);
if (!ret) {

4
arch/powerpc/platforms/cell/spufs/fault.c
Näytä tiedosto

@@ -141,8 +141,8 @@ int spufs_handle_class1(struct spu_context *ctx)
/* we must not hold the lock when entering copro_handle_mm_fault */
spu_release(ctx);
access = (_PAGE_PRESENT | _PAGE_USER);
access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_RW : 0UL;
access = (_PAGE_PRESENT | _PAGE_READ | _PAGE_USER);
access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_WRITE : 0UL;
local_irq_save(flags);
ret = hash_page(ea, access, 0x300, dsisr);
local_irq_restore(flags);