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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-19 08:49:25 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-26 15:22:23 +0300 |
| commit | da1adea07576722da4597b0df7d00931f0203229 (patch) | |
| tree | f638ecdb345c8a2f375f7c7ff1013a1cbbaa01e1 /arch/powerpc/Kconfig | |
| parent | cf209951fa7f2e7a8ec92f45f27ea11bc024bbfc (diff) | |
| download | linux-da1adea07576722da4597b0df7d00931f0203229.tar.xz | |
powerpc/8xx: Allow STRICT_KERNEL_RwX with pinned TLB
Pinned TLB are 8M. Now that there is no strict boundary anymore
between text and RO data, it is possible to use 8M pinned executable
TLB that covers both text and RO data.
When PIN_TLB_DATA or PIN_TLB_TEXT is selected, enforce 8M RW data
alignment and allow STRICT_KERNEL_RWX.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c535fc97bf0dd8693192e25feeed8088701e00c6.1589866984.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index d147d379b1b9..f5e82629e2cd 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -779,9 +779,10 @@ config THREAD_SHIFT want. Only change this if you know what you are doing. config DATA_SHIFT_BOOL - bool "Set custom data alignment" if STRICT_KERNEL_RWX && \ - (PPC_BOOK3S_32 || PPC_8xx) + bool "Set custom data alignment" depends on ADVANCED_OPTIONS + depends on STRICT_KERNEL_RWX + depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !PIN_TLB_TEXT) help This option allows you to set the kernel data alignment. When RAM is mapped by blocks, the alignment needs to fit the size and @@ -803,7 +804,8 @@ config DATA_SHIFT On 8xx, large pages (512kb or 8M) are used to map kernel linear memory. Aligning to 8M reduces TLB misses as only 8M pages are used - in that case. + in that case. If PIN_TLB is selected, it must be aligned to 8M as + 8M pages will be pinned. config FORCE_MAX_ZONEORDER int "Maximum zone order" |