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[PULL,09/10] dump: simplify a bit kdump get_next_page()

Message ID 20221006153430.2775580-10-marcandre.lureau@redhat.com
State Handled Elsewhere
Headers show
Series [PULL,01/10] dump: Replace opaque DumpState pointer with a typed one | expand

Commit Message

Marc-André Lureau Oct. 6, 2022, 3:34 p.m. UTC 
From: Marc-André Lureau <marcandre.lureau@redhat.com>

This should be functionally equivalent, but slightly easier to read,
with simplified paths and checks at the end of the function.

The following patch is a major rewrite to get rid of the assert().

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 dump/dump.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)
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Patch

diff --git a/dump/dump.c b/dump/dump.c
index a905316fe5..b55a497c42 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -1132,17 +1132,11 @@  static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
     if (!block) {
         block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
         *blockptr = block;
-        assert((block->target_start & ~target_page_mask) == 0);
-        assert((block->target_end & ~target_page_mask) == 0);
-        *pfnptr = dump_paddr_to_pfn(s, block->target_start);
-        if (bufptr) {
-            *bufptr = block->host_addr;
-        }
-        return true;
+        addr = block->target_start;
+    } else {
+        addr = dump_pfn_to_paddr(s, *pfnptr + 1);
     }
-
-    *pfnptr = *pfnptr + 1;
-    addr = dump_pfn_to_paddr(s, *pfnptr);
+    assert(block != NULL);
 
     if ((addr >= block->target_start) &&
         (addr + s->dump_info.page_size <= block->target_end)) {
@@ -1154,12 +1148,13 @@  static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
         if (!block) {
             return false;
         }
-        assert((block->target_start & ~target_page_mask) == 0);
-        assert((block->target_end & ~target_page_mask) == 0);
-        *pfnptr = dump_paddr_to_pfn(s, block->target_start);
+        addr = block->target_start;
         buf = block->host_addr;
     }
 
+    assert((block->target_start & ~target_page_mask) == 0);
+    assert((block->target_end & ~target_page_mask) == 0);
+    *pfnptr = dump_paddr_to_pfn(s, addr);
     if (bufptr) {
         *bufptr = buf;
     }