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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2021-02-19 14:00:52 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-06-07 18:06:58 +0300 |
| commit | d460bb6c6417588dd8b0907d34f69b237918812a (patch) | |
| tree | 3f8c9570961c2d59b0fbe11e8d97546abea7d70a /arch/s390/Kconfig | |
| parent | 15e5b53ff4c92c8ea79094871f91d077bfc60526 (diff) | |
| download | linux-d460bb6c6417588dd8b0907d34f69b237918812a.tar.xz | |
s390: enable HAVE_IOREMAP_PROT
In commit b02002cc4c0f ("s390/pci: Implement ioremap_wc/prot() with
MIO") we implemented both ioremap_wc() and ioremap_prot() however until
now we had not set HAVE_IOREMAP_PROT in Kconfig, do so now.
This also requires implementing pte_pgprot() as this is used in the
generic_access_phys() code enabled by CONFIG_HAVE_IOREMAP_PROT. As with
ioremap_wc() we need to take the MMIO Write Back bit index into account.
Moreover since the pgprot value returned from pte_pgprot() is to be used
for mappings into kernel address space we must make sure that it uses
appropriate kernel page table protection bits. In particular a pgprot
value originally coming from userspace could have the _PAGE_PROTECT
bit set to enable fault based dirty bit accounting which would then make
the mapping inaccessible when used in kernel address space.
Fixes: b02002cc4c0f ("s390/pci: Implement ioremap_wc/prot() with MIO")
Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index b4c7c34069f8..d6582f57e0a1 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -164,6 +164,7 @@ config S390 select HAVE_FUTEX_CMPXCHG if FUTEX select HAVE_GCC_PLUGINS select HAVE_GENERIC_VDSO + select HAVE_IOREMAP_PROT if PCI select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_KERNEL_BZIP2 select HAVE_KERNEL_GZIP |