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Alexandre Ghiti 2b89c3f9d3 mm: Introduce flush_cache_vmap_early() 
[ Upstream commit 7a92fc8b4d ]

The pcpu setup when using the page allocator sets up a new vmalloc
mapping very early in the boot process, so early that it cannot use the
flush_cache_vmap() function which may depend on structures not yet
initialized (for example in riscv, we currently send an IPI to flush
other cpus TLB).

But on some architectures, we must call flush_cache_vmap(): for example,
in riscv, some uarchs can cache invalid TLB entries so we need to flush
the new established mapping to avoid taking an exception.

So fix this by introducing a new function flush_cache_vmap_early() which
is called right after setting the new page table entry and before
accessing this new mapping. This new function implements a local flush
tlb on riscv and is no-op for other architectures (same as today).

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Stable-dep-of: d9807d60c1 ("riscv: mm: execute local TLB flush after populating vmemmap")
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-02-16 19:14:25 +01:00
..
boot arc: dts: Harmonize EHCI/OHCI DT nodes name 2022-10-17 16:32:12 -07:00
configs treewide: drop CONFIG_EMBEDDED 2023-08-21 13:46:25 -07:00
include mm: Introduce flush_cache_vmap_early() 2024-02-16 19:14:25 +01:00
kernel ARC: fix smatch warning 2023-12-08 16:30:24 -08:00
lib ARCv2: memset: don't prefetch for len == 0 which happens a alot 2023-08-17 12:40:26 -07:00
mm ARC: mm: retire support for aliasing VIPT D$ 2023-12-08 16:30:24 -08:00
plat-axs10x arc: Explicitly include correct DT includes 2023-08-23 22:28:53 -07:00
plat-hsdk arc: Replace lkml.org links with lore 2021-12-28 19:48:49 -08:00
plat-sim ARC: merge HAPS-HS with nSIM-HS configs 2019-10-28 12:12:31 -07:00
plat-tb10x treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig ARC: mm: retire support for aliasing VIPT D$ 2023-12-08 16:30:24 -08:00
Kconfig.debug Kconfig: consolidate the "Kernel hacking" menu 2018-08-02 08:06:48 +09:00
Makefile ARC: entry: use gp to cache task pointer (vs. r25) 2023-08-17 20:31:59 -07:00