[PATCH -v3 1/4] x86, MCE: Make the mce_ring explicit

[Borislav Petkov]

From: Borislav Petkov <b...@suse.de>

We would want to hand down a ring on which to operate so make it an
argument.

Use the obvious mce_ring_empty() in mce_ring_get() for better
readability.

Signed-off-by: Borislav Petkov <b...@suse.de>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 4fc57975acc1..4c0167070e2e 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -476,23 +476,21 @@ struct mce_ring {
 static DEFINE_PER_CPU(struct mce_ring, mce_ring);
 
 /* Runs with CPU affinity in workqueue */
-static int mce_ring_empty(void)
+static inline int mce_ring_empty(struct mce_ring *r)
 {
-       struct mce_ring *r = &__get_cpu_var(mce_ring);
-
        return r->start == r->end;
 }
 
-static int mce_ring_get(unsigned long *pfn)
+static int mce_ring_get(struct mce_ring *r, unsigned long *pfn)
 {
-       struct mce_ring *r;
        int ret = 0;
 
        *pfn = 0;
        get_cpu();
-       r = &__get_cpu_var(mce_ring);
-       if (r->start == r->end)
+
+       if (mce_ring_empty(r))
                goto out;
+
        *pfn = r->ring[r->start];
        r->start = (r->start + 1) % MCE_RING_SIZE;
        ret = 1;
@@ -502,9 +500,8 @@ out:
 }
 
 /* Always runs in MCE context with preempt off */
-static int mce_ring_add(unsigned long pfn)
+static int mce_ring_add(struct mce_ring *r, unsigned long pfn)
 {
-       struct mce_ring *r = &__get_cpu_var(mce_ring);
        unsigned next;
 
        next = (r->end + 1) % MCE_RING_SIZE;
@@ -525,7 +522,7 @@ int mce_available(struct cpuinfo_x86 *c)
 
 static void mce_schedule_work(void)
 {
-       if (!mce_ring_empty())
+       if (!mce_ring_empty(&__get_cpu_var(mce_ring)))
                schedule_work(&__get_cpu_var(mce_work));
 }
 
@@ -1122,7 +1119,8 @@ void do_machine_check(struct pt_regs *regs, long 
error_code)
                 * RED-PEN don't ignore overflow for mca_cfg.tolerant == 0
                 */
                if (severity == MCE_AO_SEVERITY && mce_usable_address(&m))
-                       mce_ring_add(m.addr >> PAGE_SHIFT);
+                       mce_ring_add(&__get_cpu_var(mce_ring),
+                                    m.addr >> PAGE_SHIFT);
 
                mce_log(&m);
 
@@ -1229,7 +1227,7 @@ static void mce_process_work(struct work_struct *dummy)
 {
        unsigned long pfn;
 
-       while (mce_ring_get(&pfn))
+       while (mce_ring_get(&__get_cpu_var(mce_ring), &pfn))
                memory_failure(pfn, MCE_VECTOR, 0);
 }
 
-- 
2.0.0

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