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| author | James Morse <james.morse@arm.com> | 2016-02-05 17:58:49 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-02-18 20:27:05 +0300 |
| commit | 644c2ae198412c956700e55a2acf80b2541f6aa5 (patch) | |
| tree | 826a6a215b41ba92fed9d74257424cd8ad7de6c7 | |
| parent | 57f4959bad0a154aeca125b7d38d1d9471a12422 (diff) | |
| download | linux-644c2ae198412c956700e55a2acf80b2541f6aa5.tar.xz | |
arm64: cpufeature: Test 'matches' pointer to find the end of the list
CPU feature code uses the desc field as a test to find the end of the list,
this means every entry must have a description. This generates noise for
entries in the list that aren't really features, but combinations of them.
e.g.
> CPU features: detected feature: Privileged Access Never
> CPU features: detected feature: PAN and not UAO
These combination features are needed for corner cases with alternatives,
where cpu features interact.
Change all walkers of the arm64_features[] and arm64_hwcaps[] lists to test
'matches' not 'desc', and only print 'desc' if it is non-NULL.
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by : Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index ae22edf9d3c9..9cc8186cd14b 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -771,7 +771,7 @@ static void __init setup_cpu_hwcaps(void) int i; const struct arm64_cpu_capabilities *hwcaps = arm64_hwcaps; - for (i = 0; hwcaps[i].desc; i++) + for (i = 0; hwcaps[i].matches; i++) if (hwcaps[i].matches(&hwcaps[i])) cap_set_hwcap(&hwcaps[i]); } @@ -781,11 +781,11 @@ void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps, { int i; - for (i = 0; caps[i].desc; i++) { + for (i = 0; caps[i].matches; i++) { if (!caps[i].matches(&caps[i])) continue; - if (!cpus_have_cap(caps[i].capability)) + if (!cpus_have_cap(caps[i].capability) && caps[i].desc) pr_info("%s %s\n", info, caps[i].desc); cpus_set_cap(caps[i].capability); } @@ -800,7 +800,7 @@ enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps) { int i; - for (i = 0; caps[i].desc; i++) + for (i = 0; caps[i].matches; i++) if (caps[i].enable && cpus_have_cap(caps[i].capability)) on_each_cpu(caps[i].enable, NULL, true); } @@ -907,7 +907,7 @@ void verify_local_cpu_capabilities(void) return; caps = arm64_features; - for (i = 0; caps[i].desc; i++) { + for (i = 0; caps[i].matches; i++) { if (!cpus_have_cap(caps[i].capability) || !caps[i].sys_reg) continue; /* @@ -920,7 +920,7 @@ void verify_local_cpu_capabilities(void) caps[i].enable(NULL); } - for (i = 0, caps = arm64_hwcaps; caps[i].desc; i++) { + for (i = 0, caps = arm64_hwcaps; caps[i].matches; i++) { if (!cpus_have_hwcap(&caps[i])) continue; if (!feature_matches(__raw_read_system_reg(caps[i].sys_reg), &caps[i])) |