On Thu, May 20, 2021 at 01:43:54PM +0100, Fuad Tabba wrote:

invalidate_icache_range() works on the kernel linear map, and
doesn't need uaccess. Remove the code that toggles
uaccess_ttbr0_enable, as well as the code that emits an entry
into the exception table (via the macro
invalidate_icache_by_line).

Changes return type of invalidate_icache_range() from int (which
used to indicate a fault) to void, since it doesn't need uaccess
and won't fault. Note that return value was never checked by any
of the callers.

No functional change intended.
Possible performance impact due to the reduced number of
instructions.

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/linux-arch/20200511110014.lb9PEahJ4hVOYrbwIb_qUHXyNy9KQzNFdb_I3YlzY6A@z/
Signed-off-by: Fuad Tabba <redacted>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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