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perf/x86/intel/pt: Fix pt_topa_entry_for_page() address calculation

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Currently, perf allocates an array of page pointers which is limited in
size by MAX_PAGE_ORDER. That in turn limits the maximum Intel PT buffer
size to 2GiB. Should that limitation be lifted, the Intel PT driver can
support larger sizes, except for one calculation in
pt_topa_entry_for_page(), which is limited to 32-bits.

Fix pt_topa_entry_for_page() address calculation by adding a cast.

Fixes: 39152ee51b ("perf/x86/intel/pt: Get rid of reverse lookup table for ToPA")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240624201101.60186-4-adrian.hunter@intel.com
This commit is contained in:
Adrian Hunter 2024-06-24 23:10:57 +03:00 committed by Peter Zijlstra
parent ad97196379
commit 3520b251dc
1 changed files with 1 additions and 1 deletions
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2
arch/x86/events/intel/pt.c
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@ -990,7 +990,7 @@ pt_topa_entry_for_page(struct pt_buffer *buf, unsigned int pg)
* order allocations, there shouldn't be many of these.
*/
list_for_each_entry(topa, &buf->tables, list) {
if (topa->offset + topa->size > pg << PAGE_SHIFT)
if (topa->offset + topa->size > (unsigned long)pg << PAGE_SHIFT)
goto found;
}