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dump: simplify a bit kdump get_next_page()

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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>
This commit is contained in:
Marc-André Lureau 2022-08-25 12:40:12 +04:00
parent 2341a94d3a
commit 08df343874
1 changed files with 8 additions and 13 deletions
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21
dump/dump.c
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@ -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;
addr = block->target_start;
} else {
addr = dump_pfn_to_paddr(s, *pfnptr + 1);
}
return true;
}
*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;
}