diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2023-01-27 06:53:06 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-02-09 22:40:32 +0300 |
| commit | 950b879b7f0251317d26bae0687e72592d607532 (patch) | |
| tree | 97779c296424eff693c43f306e1d55609b596b5d | |
| parent | eb7423273cc9922ee2d05bf660c034d7d515bb91 (diff) | |
| download | linux-950b879b7f0251317d26bae0687e72592d607532.tar.xz | |
riscv: Fixup race condition on PG_dcache_clean in flush_icache_pte
In commit 588a513d3425 ("arm64: Fix race condition on PG_dcache_clean
in __sync_icache_dcache()"), we found RISC-V has the same issue as the
previous arm64. The previous implementation didn't guarantee the correct
sequence of operations, which means flush_icache_all() hasn't been
called when the PG_dcache_clean was set. That would cause a risk of page
synchronization.
Fixes: 08f051eda33b ("RISC-V: Flush I$ when making a dirty page executable")
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230127035306.1819561-1-guoren@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| -rw-r--r-- | arch/riscv/mm/cacheflush.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index 3cc07ed45aeb..fcd6145fbead 100644 --- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -90,8 +90,10 @@ void flush_icache_pte(pte_t pte) if (PageHuge(page)) page = compound_head(page); - if (!test_and_set_bit(PG_dcache_clean, &page->flags)) + if (!test_bit(PG_dcache_clean, &page->flags)) { flush_icache_all(); + set_bit(PG_dcache_clean, &page->flags); + } } #endif /* CONFIG_MMU */ |