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[Xen-devel,v3,15/15] xen/arm: gic-v3: Update some comments in the code

Message ID 1424098255-22490-16-git-send-email-julien.grall@linaro.org
State Accepted, archived
Headers show

Commit Message

Julien Grall Feb. 16, 2015, 2:50 p.m. UTC 
- Drop wrong comment about the default stride. It's not always 2 * SZ_64K.
    When the re-distributor support VLPIs (from GICv4), the default
    stride is 4 * SZ_64K

    - Explain why SZ_64K * 2

Signed-off-by: Julien Grall <julien.grall@linaro.org>

---
    Changes in v3:
        - Update commit message

    Changes in v2:
        - Patch added
---
 xen/arch/arm/gic-v3.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index e7a7789..41042ab 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -639,7 +639,7 @@  static int __init gicv3_populate_rdist(void)
                 ptr += gicv3.rdist_stride;
             else
             {
-                ptr += SZ_64K * 2;
+                ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
                 if ( typer & GICR_TYPER_VLPIS )
                     ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
             }
@@ -1250,7 +1250,6 @@  static int __init gicv3_init(struct dt_device_node *node, const void *data)
     /* The vGIC code requires the region to be sorted */
     sort(rdist_regs, gicv3.rdist_count, sizeof(*rdist_regs), cmp_rdist, NULL);
 
-    /* If stride is not set in dt. Set default to 2 * SZ_64K */
     if ( !dt_property_read_u32(node, "redistributor-stride", &gicv3.rdist_stride) )
         gicv3.rdist_stride = 0;