dmesg (from util-linux) currently has two methods for reading the kernel
message ring buffer: /dev/kmsg and syslog(2). Since kernel 3.5.0 kmsg has been
the default, which escapes control characters (e.g. new lines) before they are
shown.
This change means that when dmesg is using /dev/kmsg, a 2 line printk makes the
output messy, because the second line does not get a timestamp.
For example:
[ 0.012863] CPU0: Thermal monitoring enabled (TM1)
[ 0.012869] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
[ 0.012958] Freeing SMP alternatives memory: 28K (ffffffff81d86000 -
ffffffff81d8d000)
[ 0.014961] dmar: Host address width 39
Because printk.c intentionally escapes control characters, they should not be
there in the first place.
This patch fixes two occurrences of this.
V2: Revert change to log level, only fix the newline formatting issue
V3: Expand patch description
V3b: Fix silly mistake (log level)
Signed-off-by: Steven Honeyman <stevenhoney...@gmail.com>
---
arch/x86/kernel/cpu/common.c | 11 ++++++-----
arch/x86/kernel/cpu/intel.c | 6 ++----
2 files changed, 8 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 4b4f78c..fbdd7bf 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -494,12 +494,13 @@ void cpu_detect_tlb(struct cpuinfo_x86 *c)
if (this_cpu->c_detect_tlb)
this_cpu->c_detect_tlb(c);
- printk(KERN_INFO "Last level iTLB entries: 4KB %d, 2MB %d, 4MB %d\n"
- "Last level dTLB entries: 4KB %d, 2MB %d, 4MB %d, 1GB %d\n",
+ pr_info("Last level iTLB entries: 4KB %d, 2MB %d, 4MB %d\n",
tlb_lli_4k[ENTRIES], tlb_lli_2m[ENTRIES],
- tlb_lli_4m[ENTRIES], tlb_lld_4k[ENTRIES],
- tlb_lld_2m[ENTRIES], tlb_lld_4m[ENTRIES],
- tlb_lld_1g[ENTRIES]);
+ tlb_lli_4m[ENTRIES]);
+
+ pr_info("Last level dTLB entries: 4KB %d, 2MB %d, 4MB %d, 1GB %d\n",
+ tlb_lld_4k[ENTRIES], tlb_lld_2m[ENTRIES],
+ tlb_lld_4m[ENTRIES], tlb_lld_1g[ENTRIES]);
}
void detect_ht(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 9cc6b6f..dcd08a3 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -487,10 +487,8 @@ static void init_intel(struct cpuinfo_x86 *c)
rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
if ((epb & 0xF) == ENERGY_PERF_BIAS_PERFORMANCE) {
- printk_once(KERN_WARNING "ENERGY_PERF_BIAS:"
- " Set to 'normal', was 'performance'\n"
- "ENERGY_PERF_BIAS: View and update with"
- " x86_energy_perf_policy(8)\n");
+ pr_warn_once("ENERGY_PERF_BIAS: Set to 'normal', was
'performance'\n");
+ pr_warn_once("ENERGY_PERF_BIAS: View and update with
x86_energy_perf_policy(8)\n");
epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
}
--
2.1.3
--
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