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| author | Will Deacon <[email protected]> | 2018-02-21 12:59:27 +0000 |
|---|---|---|
| committer | Catalin Marinas <[email protected]> | 2018-02-22 11:25:53 +0000 |
| commit | 15122ee2c515a253b0c66a3e618bc7ebe35105eb (patch) | |
| tree | 930c790bb615babec3527f85fdbbec6628cf938d /scripts/gcc-plugins/cyc_complexity_plugin.c | |
| parent | arm64: perf: correct PMUVer probing (diff) | |
| download | kernel-15122ee2c515a253b0c66a3e618bc7ebe35105eb.tar.gz kernel-15122ee2c515a253b0c66a3e618bc7ebe35105eb.zip | |
arm64: Enforce BBM for huge IO/VMAP mappings
ioremap_page_range doesn't honour break-before-make and attempts to put
down huge mappings (using p*d_set_huge) over the top of pre-existing
table entries. This leads to us leaking page table memory and also gives
rise to TLB conflicts and spurious aborts, which have been seen in
practice on Cortex-A75.
Until this has been resolved, refuse to put block mappings when the
existing entry is found to be present.
Fixes: 324420bf91f60 ("arm64: add support for ioremap() block mappings")
Reported-by: Hanjun Guo <[email protected]>
Reported-by: Lei Li <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Diffstat (limited to 'scripts/gcc-plugins/cyc_complexity_plugin.c')
0 files changed, 0 insertions, 0 deletions