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s390/mm: add cond_resched call to kernel page table dumper

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Walking kernel page tables within the kernel page table dumper may
potentially take a lot of time. This may lead to soft lockup warning
messages.
To avoid this add a cond_resched call for each pgd_level iteration.

This is the same as "x86/mm/ptdump: Fix soft lockup in page table
walker" for x86.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2017-02-13 15:20:18 +01:00
committed by Martin Schwidefsky
parent 466178fc4e
commit 549f2bf594
1 changed files with 2 additions and 0 deletions
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arch/s390/mm/dump_pagetables.c
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@ -1,5 +1,6 @@
#include <linux/seq_file.h> #include <linux/seq_file.h>
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/sched.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <asm/sections.h> #include <asm/sections.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
@ -187,6 +188,7 @@ static void walk_pgd_level(struct seq_file *m)
else else
note_page(m, &st, _PAGE_INVALID, 1); note_page(m, &st, _PAGE_INVALID, 1);
addr += PGDIR_SIZE; addr += PGDIR_SIZE;
cond_resched();
} }
/* Flush out the last page */ /* Flush out the last page */
st.current_address = max_addr; st.current_address = max_addr;