Fix problem with `half' pages
Subsystems (2)
PATCH 1/1 Fix problem with `half' pages
We have a system here with following memory map:
/proc/iomem:
4ffe14000-4ffe7ffff : reserved
4ffe80000-4fffb5fff : System RAM
4fffb6000-4ffffffff : reserved
max_pfn = 1310720
In that case, the last page of the "System RAM" is not full in 16K page size configuration. That leads to an error in makedumpfile when it checks if that's a zero page. It's because it tries to read the whole page and the read() fails because it's after the end of the dump file.
That patch fixes this problem.
--- makedumpfile.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
makedumpfile.c +12 -3
@@ -3155,6 +3155,7 @@ create_dump_bitmap(struct DumpInfo *infofor (; pfn < mmd->pfn_end; pfn++, mem_map +=SIZE (page), paddr += info->page_size) { +int page_mem_size = info->page_size;if ((pfn !=0 ) && (pfn%PFN_BUFBITMAP ) ==0 ) {/*
@@ -3190,6 +3191,14 @@ create_dump_bitmap(struct DumpInfo *info val =0 ;/* +* check for pages that are not complete pages and +* decrease the page size here +*/ +if (val ==1 && !is_in_segs (info, paddr + info->page_size)) +while (!is_in_segs (info, paddr + page_mem_size)) + page_mem_size--; + +/* * Set the 1st-bitmap. * val 1: not memory hole * 0: memory hole
@@ -3223,13 +3232,13 @@ create_dump_bitmap(struct DumpInfo *info info->name_memory, strerror(errno)); goto out; } -if (read (info->fd_memory, buf, info->page_size) - != info->page_size) { +if (read (info->fd_memory, buf, page_mem_size) + != page_mem_size) {ERRMSG ("Can't read the dump memory(%s). %s\n" , info->name_memory,strerror (errno)); goto out; } -if (is_zero_page (buf, info->page_size)) +if (is_zero_page (buf, page_mem_size)) val =0 ; } if ((info->dump_level <= DL_EXCLUDE_ZERO)
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Hi Bernhard,
Quoted 7 lines · Bernhard Walle
We have a system here with following memory map:
/proc/iomem:
4ffe14000-4ffe7ffff : reserved
4ffe80000-4fffb5fff : System RAM
4fffb6000-4ffffffff : reserved
Quoted 8 lines
max_pfn= 1310720In that case, the last page of the "System RAM" is not full in 16K page size configuration. That leads to an error in makedumpfile when it checks if that's a zero page. It's because it tries to read the whole page and the
read()fails because it's after the end of the dump file.That patch fixes this problem.
Thank you for the patch.
I guess there are the other problems because makedumpfile should not access incomplete page.
To confirm the problem, I'd like to see the makedumpfile log with -D option. Could you send it ?
Thanks
Ken'ichi Ohmichi
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