misc: sgi-gru: remove interrupt-context page-table walks

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The GRU TLB miss handler walks a process's page tables without holding
page-table locks or a reference to the mapped page. It also uses a kernel
page-table accessor on user page tables and supports only PMD-level large
mappings on x86-64.

Remove the direct walker. Send interrupt faults directly to user polling
mode so the existing call-OS fallback retries them in process context.

Remove the mmap-lock failure statistic that can no longer be incremented.

Fixes: 142586409c ("GRU Driver: page faults & exceptions")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@arm.com>
Link: https://patch.msgid.link/20260730111316.3672672-2-usama.anjum@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Muhammad Usama Anjum 2026-07-30 12:12:50 +01:00 • committed by Greg Kroah-Hartman

parent facd8463a5

commit 928a8e9f52

3 changed files with 12 additions and 91 deletions

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101

drivers/misc/sgi-gru/grufault.c

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1

drivers/misc/sgi-gru/gruprocfs.c

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1

drivers/misc/sgi-gru/grutables.h

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