4.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bo Yan <byan@xxxxxxxxxx>
commit 6d1966dfd6e0ad2f8aa4b664ae1a62e33abe1998 upstream.
Register MIDR_EL1 is masked to get variant and revision fields, then
compared against midr_range_min and midr_range_max when checking
whether CPU is affected by any particular erratum. However, variant
and revision fields in MIDR_EL1 are separated by 16 bits, so the min
and max of midr range should be constructed accordingly, otherwise
the patch will not be applied when variant field is non-0.
Acked-by: Andre Przywara <andre.przywara@xxxxxxx>
Reviewed-by: Paul Walmsley <paul@xxxxxxxxx>
Signed-off-by: Bo Yan <byan@xxxxxxxxxx>
[will: use MIDR_VARIANT_SHIFT to construct upper bound]
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/cpu_errata.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -88,7 +88,8 @@ struct arm64_cpu_capabilities arm64_erra
/* Cortex-A57 r0p0 - r1p2 */
.desc = "ARM erratum 832075",
.capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
- MIDR_RANGE(MIDR_CORTEX_A57, 0x00, 0x12),
+ MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
+ (1 << MIDR_VARIANT_SHIFT) | 2),
},
#endif
{
--
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