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Commit 7bebd83d authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Fix off-by-1 error in TSB grow check. 



The worst part about this bug is what it would cause
a hugepage TSB to be allocated for every address space
since "0 >= 0".

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5d5d7727

arch/sparc64/mm/fault.c

+2 −2
Original line number Diff line number Diff line
@@ -413,12 +413,12 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs) 
#ifdef CONFIG_HUGETLB_PAGE

	mm_rss -= (mm->context.huge_pte_count * (HPAGE_SIZE / PAGE_SIZE));

#endif

	if (unlikely(mm_rss >=

	if (unlikely(mm_rss >

		     mm->context.tsb_block[MM_TSB_BASE].tsb_rss_limit))

		tsb_grow(mm, MM_TSB_BASE, mm_rss);

#ifdef CONFIG_HUGETLB_PAGE

	mm_rss = mm->context.huge_pte_count;

	if (unlikely(mm_rss >=

	if (unlikely(mm_rss >

		     mm->context.tsb_block[MM_TSB_HUGE].tsb_rss_limit))

		tsb_grow(mm, MM_TSB_HUGE, mm_rss);

#endif