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

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BugLink: https://bugs.launchpad.net/bugs/2083196

[ Upstream commit 3520b251dcae2b4a27b95cd6f745c54fd658bda5 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Adrian Hunter
2024-06-24 23:10:57 +03:00
committed by Mehmet Basaran
parent 1b58a4f06c
commit e44b66a7e5
1 changed files with 1 additions and 1 deletions
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arch/x86/events/intel/pt.c
+1 -1
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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;
}