Revision 38860b2c8bb1b92f61396eb06a63adff916fc31d authored by John David Anglin on 08 November 2021, 21:48:16 UTC, committed by Helge Deller on 13 November 2021, 21:10:56 UTC
For years, there have been random segmentation faults in userspace on SMP PA-RISC machines. It occurred to me that this might be a problem in set_pte_at(). MIPS and some other architectures do cache flushes when installing PTEs with the present bit set. Here I have adapted the code in update_mmu_cache() to flush the kernel mapping when the kernel flush is deferred, or when the kernel mapping may alias with the user mapping. This simplifies calls to update_mmu_cache(). I also changed the barrier in set_pte() from a compiler barrier to a full memory barrier. I know this change is not sufficient to fix the problem. It might not be needed. I have had a few days of operation with 5.14.16 to 5.15.1 and haven't seen any random segmentation faults on rp3440 or c8000 so far. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@kernel.org # 5.12+
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| File | Mode | Size |
|---|---|---|
| adi | ||
| amd | ||
| atmel | ||
| au1x | ||
| bcm | ||
| cirrus | ||
| codecs | ||
| dwc | ||
| fsl | ||
| generic | ||
| hisilicon | ||
| img | ||
| intel | ||
| jz4740 | ||
| kirkwood | ||
| mediatek | ||
| meson | ||
| mxs | ||
| pxa | ||
| qcom | ||
| rockchip | ||
| samsung | ||
| sh | ||
| sof | ||
| spear | ||
| sprd | ||
| sti | ||
| stm | ||
| sunxi | ||
| tegra | ||
| ti | ||
| uniphier | ||
| ux500 | ||
| xilinx | ||
| xtensa | ||
| Kconfig | -rw-r--r-- | 2.7 KB |
| Makefile | -rw-r--r-- | 1.9 KB |
| soc-ac97.c | -rw-r--r-- | 10.6 KB |
| soc-acpi.c | -rw-r--r-- | 2.9 KB |
| soc-card.c | -rw-r--r-- | 4.8 KB |
| soc-component.c | -rw-r--r-- | 33.0 KB |
| soc-compress.c | -rw-r--r-- | 17.9 KB |
| soc-core.c | -rw-r--r-- | 82.4 KB |
| soc-dai.c | -rw-r--r-- | 20.6 KB |
| soc-dapm.c | -rw-r--r-- | 121.7 KB |
| soc-devres.c | -rw-r--r-- | 3.9 KB |
| soc-generic-dmaengine-pcm.c | -rw-r--r-- | 13.8 KB |
| soc-jack.c | -rw-r--r-- | 11.3 KB |
| soc-link.c | -rw-r--r-- | 5.6 KB |
| soc-ops.c | -rw-r--r-- | 25.0 KB |
| soc-pcm.c | -rw-r--r-- | 75.9 KB |
| soc-topology-test.c | -rw-r--r-- | 24.3 KB |
| soc-topology.c | -rw-r--r-- | 73.0 KB |
| soc-utils.c | -rw-r--r-- | 5.5 KB |
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