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![]() The kmap_local conversion broke the ARM architecture, because the new
code assumes that all PTEs used for creating kmaps form a linear array
in memory, and uses array indexing to look up the kmap PTE belonging to
a certain kmap index.
On ARM, this cannot work, not only because the PTE pages may be
non-adjacent in memory, but also because ARM/!LPAE interleaves hardware
entries and extended entries (carrying software-only bits) in a way that
is not compatible with array indexing.
Fortunately, this only seems to affect configurations with more than 8
CPUs, due to the way the per-CPU kmap slots are organized in memory.
Work around this by permitting an architecture to set a Kconfig symbol
that signifies that the kmap PTEs do not form a lineary array in memory,
and so the only way to locate the appropriate one is to walk the page
tables.
Link: https://lore.kernel.org/linux-arm-kernel/20211026131249.3731275-1-ardb@kernel.org/
Link: https://lkml.kernel.org/r/20211116094737.7391-1-ardb@kernel.org
Fixes:
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.. | ||
boot | ||
common | ||
configs | ||
crypto | ||
include | ||
kernel | ||
lib | ||
mach-actions | ||
mach-alpine | ||
mach-artpec | ||
mach-asm9260 | ||
mach-aspeed | ||
mach-at91 | ||
mach-axxia | ||
mach-bcm | ||
mach-berlin | ||
mach-clps711x | ||
mach-cns3xxx | ||
mach-davinci | ||
mach-digicolor | ||
mach-dove | ||
mach-ep93xx | ||
mach-exynos | ||
mach-footbridge | ||
mach-gemini | ||
mach-highbank | ||
mach-hisi | ||
mach-imx | ||
mach-integrator | ||
mach-iop32x | ||
mach-ixp4xx | ||
mach-keystone | ||
mach-lpc18xx | ||
mach-lpc32xx | ||
mach-mediatek | ||
mach-meson | ||
mach-milbeaut | ||
mach-mmp | ||
mach-moxart | ||
mach-mstar | ||
mach-mv78xx0 | ||
mach-mvebu | ||
mach-mxs | ||
mach-nomadik | ||
mach-npcm | ||
mach-nspire | ||
mach-omap1 | ||
mach-omap2 | ||
mach-orion5x | ||
mach-oxnas | ||
mach-pxa | ||
mach-qcom | ||
mach-rda | ||
mach-realtek | ||
mach-realview | ||
mach-rockchip | ||
mach-rpc | ||
mach-s3c | ||
mach-s5pv210 | ||
mach-sa1100 | ||
mach-shmobile | ||
mach-socfpga | ||
mach-spear | ||
mach-sti | ||
mach-stm32 | ||
mach-sunxi | ||
mach-tegra | ||
mach-uniphier | ||
mach-ux500 | ||
mach-versatile | ||
mach-vexpress | ||
mach-vt8500 | ||
mach-zynq | ||
mm | ||
net | ||
nwfpe | ||
plat-omap | ||
plat-orion | ||
plat-pxa | ||
plat-versatile | ||
probes | ||
tools | ||
vdso | ||
vfp | ||
xen | ||
Kbuild | ||
Kconfig | ||
Kconfig-nommu | ||
Kconfig.assembler | ||
Kconfig.debug | ||
Makefile |