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mm/page_owner: fix recursion bug after changing skip entries
This patch fixes commit5f48f0bd4e
("mm, page_owner: skip unnecessary stack_trace entries"). Because if we skip first two entries then logic of checking count value as 2 for recursion is broken and code will go in one depth recursion. so we need to check only one call of _RET_IP(__set_page_owner) while checking for recursion. Current Backtrace while checking for recursion:- (save_stack) from (__set_page_owner) // (But recursion returns true here) (__set_page_owner) from (get_page_from_freelist) (get_page_from_freelist) from (__alloc_pages_nodemask) (__alloc_pages_nodemask) from (depot_save_stack) (depot_save_stack) from (save_stack) // recursion should return true here (save_stack) from (__set_page_owner) (__set_page_owner) from (get_page_from_freelist) (get_page_from_freelist) from (__alloc_pages_nodemask+) (__alloc_pages_nodemask) from (depot_save_stack) (depot_save_stack) from (save_stack) (save_stack) from (__set_page_owner) (__set_page_owner) from (get_page_from_freelist) Correct Backtrace with fix: (save_stack) from (__set_page_owner) // recursion returned true here (__set_page_owner) from (get_page_from_freelist) (get_page_from_freelist) from (__alloc_pages_nodemask+) (__alloc_pages_nodemask) from (depot_save_stack) (depot_save_stack) from (save_stack) (save_stack) from (__set_page_owner) (__set_page_owner) from (get_page_from_freelist) Link: http://lkml.kernel.org/r/1521607043-34670-1-git-send-email-maninder1.s@samsung.com Fixes:5f48f0bd4e
("mm, page_owner: skip unnecessary stack_trace entries") Signed-off-by: Maninder Singh <maninder1.s@samsung.com> Signed-off-by: Vaneet Narang <v.narang@samsung.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@techadventures.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ayush Mittal <ayush.m@samsung.com> Cc: Prakash Gupta <guptap@codeaurora.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Cc: Vasyl Gomonovych <gomonovych@gmail.com> Cc: Amit Sahrawat <a.sahrawat@samsung.com> Cc: <pankaj.m@samsung.com> Cc: Vaneet Narang <v.narang@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -123,13 +123,13 @@ void __reset_page_owner(struct page *page, unsigned int order)
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static inline bool check_recursive_alloc(struct stack_trace *trace,
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unsigned long ip)
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{
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int i, count;
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int i;
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if (!trace->nr_entries)
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return false;
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for (i = 0, count = 0; i < trace->nr_entries; i++) {
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if (trace->entries[i] == ip && ++count == 2)
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for (i = 0; i < trace->nr_entries; i++) {
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if (trace->entries[i] == ip)
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return true;
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}
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