https://github.com/torvalds/linux
Revision 29daf869cbab69088fe1755d9dd224e99ba78b56 authored by Christophe Leroy on 12 October 2020, 08:54:31 UTC, committed by Michael Ellerman on 05 November 2020, 12:34:25 UTC
The kernel expects pte_young() to work regardless of CONFIG_SWAP.
Make sure a minor fault is taken to set _PAGE_ACCESSED when it
is not already set, regardless of the selection of CONFIG_SWAP.
This adds at least 3 instructions to the TLB miss exception
handlers fast path. Following patch will reduce this overhead.
Also update the rotation instruction to the correct number of bits
to reflect all changes done to _PAGE_ACCESSED over time.
Fixes: d069cb4373fe ("powerpc/8xx: Don't touch ACCESSED when no SWAP.")
Fixes: 5f356497c384 ("powerpc/8xx: remove unused _PAGE_WRITETHRU")
Fixes: e0a8e0d90a9f ("powerpc/8xx: Handle PAGE_USER via APG bits")
Fixes: 5b2753fc3e8a ("powerpc/8xx: Implementation of PAGE_EXEC")
Fixes: a891c43b97d3 ("powerpc/8xx: Prepare handlers for _PAGE_HUGE for 512k pages.")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/af834e8a0f1fa97bfae65664950f0984a70c4750.1602492856.git.christophe.leroy@csgroup.eu
1 parent 0540b0d
Tip revision: 29daf869cbab69088fe1755d9dd224e99ba78b56 authored by Christophe Leroy on 12 October 2020, 08:54:31 UTC
powerpc/8xx: Always fault when _PAGE_ACCESSED is not set
powerpc/8xx: Always fault when _PAGE_ACCESSED is not set
Tip revision: 29daf86
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| .clang-format | -rw-r--r-- | 16.3 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.8 KB |
| .mailmap | -rw-r--r-- | 17.4 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 97.8 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 562.2 KB |
| Makefile | -rw-r--r-- | 62.7 KB |
| README | -rw-r--r-- | 727 bytes |
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