[Xen-devel] [PATCH 1/3] x86/xen: don't count how many PFNs are identity mapped

[David Vrabel <david.vrabel@xxxxxxxxxx>]

This accounting is just used to print a diagnostic message that isn't
very useful.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 arch/x86/xen/setup.c |   27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index dfd77de..664dffc 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -229,15 +229,14 @@ static int __init xen_free_mfn(unsigned long mfn)
  * as a fallback if the remapping fails.
  */
 static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
-       unsigned long end_pfn, unsigned long nr_pages, unsigned long *identity,
-       unsigned long *released)
+       unsigned long end_pfn, unsigned long nr_pages, unsigned long *released)
 {
-       unsigned long len = 0;
        unsigned long pfn, end;
        int ret;
 
        WARN_ON(start_pfn > end_pfn);
 
+       /* Release pages first. */
        end = min(end_pfn, nr_pages);
        for (pfn = start_pfn; pfn < end; pfn++) {
                unsigned long mfn = pfn_to_mfn(pfn);
@@ -250,16 +249,14 @@ static void __init 
xen_set_identity_and_release_chunk(unsigned long start_pfn,
                WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
 
                if (ret == 1) {
+                       (*released)++;
                        if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
                                break;
-                       len++;
                } else
                        break;
        }
 
-       /* Need to release pages first */
-       *released += len;
-       *identity += set_phys_range_identity(start_pfn, end_pfn);
+       set_phys_range_identity(start_pfn, end_pfn);
 }
 
 /*
@@ -318,7 +315,6 @@ static void __init xen_do_set_identity_and_remap_chunk(
        unsigned long ident_pfn_iter, remap_pfn_iter;
        unsigned long ident_end_pfn = start_pfn + size;
        unsigned long left = size;
-       unsigned long ident_cnt = 0;
        unsigned int i, chunk;
 
        WARN_ON(size == 0);
@@ -347,8 +343,7 @@ static void __init xen_do_set_identity_and_remap_chunk(
                xen_remap_mfn = mfn;
 
                /* Set identity map */
-               ident_cnt += set_phys_range_identity(ident_pfn_iter,
-                       ident_pfn_iter + chunk);
+               set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk);
 
                left -= chunk;
        }
@@ -371,7 +366,7 @@ static void __init xen_do_set_identity_and_remap_chunk(
 static unsigned long __init xen_set_identity_and_remap_chunk(
         const struct e820entry *list, size_t map_size, unsigned long start_pfn,
        unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
-       unsigned long *identity, unsigned long *released)
+       unsigned long *released)
 {
        unsigned long pfn;
        unsigned long i = 0;
@@ -386,8 +381,7 @@ static unsigned long __init 
xen_set_identity_and_remap_chunk(
                /* Do not remap pages beyond the current allocation */
                if (cur_pfn >= nr_pages) {
                        /* Identity map remaining pages */
-                       *identity += set_phys_range_identity(cur_pfn,
-                               cur_pfn + size);
+                       set_phys_range_identity(cur_pfn, cur_pfn + size);
                        break;
                }
                if (cur_pfn + size > nr_pages)
@@ -398,7 +392,7 @@ static unsigned long __init 
xen_set_identity_and_remap_chunk(
                if (!remap_range_size) {
                        pr_warning("Unable to find available pfn range, not 
remapping identity pages\n");
                        xen_set_identity_and_release_chunk(cur_pfn,
-                               cur_pfn + left, nr_pages, identity, released);
+                               cur_pfn + left, nr_pages, released);
                        break;
                }
                /* Adjust size to fit in current e820 RAM region */
@@ -410,7 +404,6 @@ static unsigned long __init 
xen_set_identity_and_remap_chunk(
                /* Update variables to reflect new mappings. */
                i += size;
                remap_pfn += size;
-               *identity += size;
        }
 
        /*
@@ -430,7 +423,6 @@ static void __init xen_set_identity_and_remap(
        unsigned long *released)
 {
        phys_addr_t start = 0;
-       unsigned long identity = 0;
        unsigned long last_pfn = nr_pages;
        const struct e820entry *entry;
        unsigned long num_released = 0;
@@ -460,14 +452,13 @@ static void __init xen_set_identity_and_remap(
                                last_pfn = xen_set_identity_and_remap_chunk(
                                                list, map_size, start_pfn,
                                                end_pfn, nr_pages, last_pfn,
-                                               &identity, &num_released);
+                                               &num_released);
                        start = end;
                }
        }
 
        *released = num_released;
 
-       pr_info("Set %ld page(s) to 1-1 mapping\n", identity);
        pr_info("Released %ld page(s)\n", num_released);
 }
 
-- 
1.7.10.4


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